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docs/csv-member-import-v1.md
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# CSV Member Import v1 - Implementation Plan
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**Version:** 1.0
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**Date:** 2025-01-XX
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**Status:** Ready for Implementation
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**Related Documents:**
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- [Feature Roadmap](./feature-roadmap.md) - Overall feature planning
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---
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## Table of Contents
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- [Overview & Scope](#overview--scope)
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- [UX Flow](#ux-flow)
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- [CSV Specification](#csv-specification)
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- [Technical Design Notes](#technical-design-notes)
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- [Implementation Issues](#implementation-issues)
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- [Rollout & Risks](#rollout--risks)
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---
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## Overview & Scope
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### What We're Building
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A **basic CSV member import feature** that allows administrators to upload a CSV file and import new members into the system. This is a **v1 minimal implementation** focused on establishing the import structure without advanced features.
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**Core Functionality (v1 Minimal):**
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- Upload CSV file via LiveView file upload
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- Parse CSV with bilingual header support for core member fields (English/German)
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- Auto-detect delimiter (`;` or `,`) using header recognition
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- Map CSV columns to core member fields (`first_name`, `last_name`, `email`, `phone_number`, `street`, `postal_code`, `city`)
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- Validate each row (required fields: `first_name`, `last_name`, `email`)
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- Create members via Ash resource (one-by-one, **no background jobs**, processed in chunks of 200 rows via LiveView messages)
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- Display import results: success count, error count, and error details
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- Provide static CSV templates (EN/DE)
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**Optional Enhancement (v1.1 - Last Issue):**
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- Custom field import (if time permits, otherwise defer to v2)
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**Key Constraints (v1):**
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- ✅ **Admin-only feature**
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- ✅ **No upsert** (create only)
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- ✅ **No deduplication** (duplicate emails fail and show as errors)
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- ✅ **No mapping wizard** (fixed header mapping via bilingual variants)
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- ✅ **No background jobs** (progress via LiveView `handle_info`)
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- ✅ **Best-effort import** (row-by-row, no rollback)
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- ✅ **UI-only error display** (no error CSV export)
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- ✅ **Safety limits** (10 MB, 1,000 rows, chunks of 200)
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### Out of Scope (v1)
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**Deferred to Future Versions:**
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- ❌ Upsert/update existing members
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- ❌ Advanced deduplication strategies
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- ❌ Column mapping wizard UI
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- ❌ Background job processing (Oban/GenStage)
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- ❌ Transactional all-or-nothing import
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- ❌ Error CSV export/download
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- ⚠️ Custom field import (optional, last issue - defer to v2 if scope is tight)
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- ❌ Batch validation preview before import
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- ❌ Date/boolean field parsing
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- ❌ Dynamic template generation
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- ❌ Import history/audit log
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- ❌ Import templates for other entities
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---
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## UX Flow
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### Access & Location
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**Entry Point:**
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- **Location:** Global Settings page (`/settings`)
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- **UI Element:** New section "Import Members (CSV)" below "Custom Fields" section
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- **Access Control:** Admin-only (enforced at LiveView event level, not entire `/settings` route)
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### User Journey
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1. **Navigate to Global Settings**
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2. **Access Import Section**
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- Upload area (drag & drop or file picker)
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- Template download links (English / German)
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- Help text explaining CSV format
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3. **Download Template (Optional)**
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4. **Prepare CSV File**
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5. **Upload CSV**
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6. **Start Import**
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- Runs server-side via LiveView messages (may take up to ~30 seconds for large files)
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7. **View Results**
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- Success count
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- Error count
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- First 50 errors, each with:
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- **CSV line number** (header is line 1, first data record begins at line 2)
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- Error message
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- Field name (if applicable)
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### Error Handling
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- **File too large:** Flash error before upload starts
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- **Too many rows:** Flash error before import starts
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- **Invalid CSV format:** Error shown in results
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- **Partial success:** Results show both success and error counts
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---
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## CSV Specification
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### Delimiter
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**Recommended:** Semicolon (`;`)
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**Supported:** `;` and `,`
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**Auto-Detection (Header Recognition):**
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- Remove UTF-8 BOM *first*
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- Extract header record and try parsing with both delimiters
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- For each delimiter, count how many recognized headers are present (via normalized variants)
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- Choose delimiter with higher recognition; prefer `;` if tied
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- If neither yields recognized headers, default to `;`
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### Quoting Rules
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- Fields may be quoted with double quotes (`"`)
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- Escaped quotes: `""` inside quoted field represents a single `"`
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- **v1 assumption:** CSV records do **not** contain embedded newlines inside quoted fields. (If they do, parsing may fail or line numbers may be inaccurate.)
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### Column Headers
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**v1 Supported Fields (Core Member Fields Only):**
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- `first_name` / `Vorname` (required)
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- `last_name` / `Nachname` (required)
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- `email` / `E-Mail` (required)
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- `phone_number` / `Telefon` (optional)
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- `street` / `Straße` (optional)
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- `postal_code` / `PLZ` / `Postleitzahl` (optional)
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- `city` / `Stadt` (optional)
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**Member Field Header Mapping:**
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| Canonical Field | English Variants | German Variants |
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|---|---|---|
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| `first_name` | `first_name`, `firstname` | `Vorname`, `vorname` |
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| `last_name` | `last_name`, `lastname`, `surname` | `Nachname`, `nachname`, `Familienname` |
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| `email` | `email`, `e-mail`, `e_mail` | `E-Mail`, `e-mail`, `e_mail` |
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| `phone_number` | `phone_number`, `phone`, `telephone` | `Telefon`, `telefon` |
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| `street` | `street`, `address` | `Straße`, `strasse`, `Strasse` |
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| `postal_code` | `postal_code`, `zip`, `postcode` | `PLZ`, `plz`, `Postleitzahl`, `postleitzahl` |
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| `city` | `city`, `town` | `Stadt`, `stadt`, `Ort` |
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**Header Normalization (used consistently for both input headers AND mapping variants):**
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- Trim whitespace
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- Convert to lowercase
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- Normalize Unicode: `ß` → `ss` (e.g., `Straße` → `strasse`)
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- Replace hyphens/whitespace with underscores: `E-Mail` → `e_mail`, `phone number` → `phone_number`
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- Collapse multiple underscores: `e__mail` → `e_mail`
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- Case-insensitive matching
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**Unknown columns:** ignored (no error)
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**Required fields:** `first_name`, `last_name`, `email`
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### CSV Template Files
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**Location:**
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- `priv/static/templates/member_import_en.csv`
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- `priv/static/templates/member_import_de.csv`
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**Content:**
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- Header row with required + common optional fields
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- One example row
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- Uses semicolon delimiter (`;`)
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- UTF-8 encoding **with BOM** (Excel compatibility)
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**Template Access:**
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- Templates are static files in `priv/static/templates/`
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- Served at:
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- `/templates/member_import_en.csv`
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- `/templates/member_import_de.csv`
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- In LiveView, link them using Phoenix static path helpers (e.g. `~p` or `Routes.static_path/2`, depending on Phoenix version).
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### File Limits
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- **Max file size:** 10 MB
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- **Max rows:** 1,000 rows (excluding header)
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- **Processing:** chunks of 200 (via LiveView messages)
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- **Encoding:** UTF-8 (BOM handled)
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---
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## Technical Design Notes
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### Architecture Overview
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```
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┌─────────────────┐
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│ LiveView UI │ (GlobalSettingsLive or component)
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│ - Upload area │
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│ - Progress │
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│ - Results │
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└────────┬────────┘
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│ prepare
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▼
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┌─────────────────────────────┐
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│ Import Service │ (Mv.Membership.Import.MemberCSV)
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│ - parse + map + limit checks│ -> returns import_state
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│ - process_chunk(chunk) │ -> returns chunk results
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└────────┬────────────────────┘
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│ create
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▼
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┌─────────────────┐
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│ Ash Resource │ (Mv.Membership.Member)
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│ - Create │
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└─────────────────┘
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```
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### Technology Stack
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- **Phoenix LiveView:** file upload via `allow_upload/3`
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- **NimbleCSV:** CSV parsing (add explicit dependency if missing)
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- **Ash Resource:** member creation via `Membership.create_member/1`
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- **Gettext:** bilingual UI/error messages
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### Module Structure
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**New Modules:**
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- `lib/mv/membership/import/member_csv.ex` - import orchestration + chunk processing
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- `lib/mv/membership/import/csv_parser.ex` - delimiter detection + parsing + BOM handling
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- `lib/mv/membership/import/header_mapper.ex` - normalization + header mapping
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**Modified Modules:**
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- `lib/mv_web/live/global_settings_live.ex` - render import section, handle upload/events/messages
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### Data Flow
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1. **Upload:** LiveView receives file via `allow_upload`
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2. **Consume:** `consume_uploaded_entries/3` reads file content
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3. **Prepare:** `MemberCSV.prepare/2`
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- Strip BOM
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- Detect delimiter (header recognition)
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- Parse header + rows
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- Map headers to canonical fields
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- Early abort if required headers missing
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- Row count check
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- Return `import_state` containing chunks and metadata
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4. **Process:** LiveView drives chunk processing via `handle_info`
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- For each chunk: validate + create + collect errors
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5. **Results:** LiveView shows progress + final summary
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### Types & Key Consistency
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- **Raw CSV parsing:** returns headers as list of strings, and rows **with csv line numbers**
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- **Header mapping:** operates on normalized strings; mapping table variants are normalized once
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- **Ash attrs:** built as atom-keyed map (`%{first_name: ..., ...}`)
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### Error Model
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```elixir
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%{
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csv_line_number: 5, # physical line number in the CSV file
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field: :email, # optional
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message: "is not a valid email"
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}
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```
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### CSV Line Numbers (Important)
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To keep error reporting user-friendly and accurate, **row errors must reference the physical line number in the original file**, even if empty lines are skipped.
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**Design decision:** the parser returns rows as:
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```elixir
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rows :: [{csv_line_number :: pos_integer(), row_map :: map()}]
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```
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Downstream logic must **not** recompute line numbers from row indexes.
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### Authorization
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**Enforcement points:**
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1. **LiveView event level:** check admin permission in `handle_event("start_import", ...)`
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2. **UI level:** render import section only for admin users
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3. **Static templates:** public assets (no authorization needed)
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Use `Mv.Authorization.PermissionSets` (preferred) instead of hard-coded string checks where possible.
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### Safety Limits
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- File size enforced by `allow_upload` (`max_file_size`)
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- Row count enforced in `MemberCSV.prepare/2` before processing starts
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- Chunking is done via **LiveView `handle_info` loop** (sequential, cooperative scheduling)
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---
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## Implementation Issues
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### Issue #1: CSV Specification & Static Template Files
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**Dependencies:** None
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**Goal:** Define CSV contract and add static templates.
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**Tasks:**
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- [ ] Finalize header mapping variants
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- [ ] Document normalization rules
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- [ ] Document delimiter detection strategy
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- [ ] Create templates in `priv/static/templates/` (UTF-8 with BOM)
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- [ ] Document template URLs and how to link them from LiveView
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- [ ] Document line number semantics (physical CSV line numbers)
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**Definition of Done:**
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- [ ] Templates open cleanly in Excel/LibreOffice
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- [ ] CSV spec section complete
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---
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### Issue #2: Import Service Module Skeleton
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**Dependencies:** None
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**Goal:** Create service API and error types.
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**API (recommended):**
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- `prepare/2` — parse + map + limit checks, returns import_state
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- `process_chunk/3` — process one chunk (pure-ish), returns per-chunk results
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**Tasks:**
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- [ ] Create `lib/mv/membership/import/member_csv.ex`
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- [ ] Define public function: `prepare/2 (file_content, opts \\ [])`
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- [ ] Define public function: `process_chunk/3 (chunk_rows_with_lines, column_map, opts \\ [])`
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- [ ] Define error struct: `%MemberCSV.Error{csv_line_number: integer, field: atom | nil, message: String.t}`
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- [ ] Document module + API
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---
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### Issue #3: CSV Parsing + Delimiter Auto-Detection + BOM Handling
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**Dependencies:** Issue #2
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**Goal:** Parse CSV robustly with correct delimiter detection and BOM handling.
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**Tasks:**
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- [ ] Verify/add NimbleCSV dependency (`{:nimble_csv, "~> 1.0"}`)
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- [ ] Create `lib/mv/membership/import/csv_parser.ex`
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- [ ] Implement `strip_bom/1` and apply it **before** any header handling
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- [ ] Handle `\r\n` and `\n` line endings (trim `\r` on header record)
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- [ ] Detect delimiter via header recognition (try `;` and `,`)
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- [ ] Parse CSV and return:
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- `headers :: [String.t()]`
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- `rows :: [{csv_line_number, [String.t()]}]` or directly `[{csv_line_number, row_map}]`
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- [ ] Skip completely empty records (but preserve correct physical line numbers)
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- [ ] Return `{:ok, headers, rows}` or `{:error, reason}`
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**Definition of Done:**
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- [ ] BOM handling works (Excel exports)
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- [ ] Delimiter detection works reliably
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- [ ] Rows carry correct `csv_line_number`
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---
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### Issue #4: Header Normalization + Per-Header Mapping (No Language Detection)
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**Dependencies:** Issue #3
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||||||
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**Goal:** Map each header individually to canonical fields (normalized comparison).
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**Tasks:**
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- [ ] Create `lib/mv/membership/import/header_mapper.ex`
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- [ ] Implement `normalize_header/1`
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- [ ] Normalize mapping variants once and compare normalized strings
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- [ ] Build `column_map` (canonical field -> column index)
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||||||
|
- [ ] **Early abort if required headers missing** (`first_name`, `last_name`, `email`)
|
||||||
|
- [ ] Ignore unknown columns
|
||||||
|
|
||||||
|
**Definition of Done:**
|
||||||
|
- [ ] English/German headers map correctly
|
||||||
|
- [ ] Missing required columns fails fast
|
||||||
|
|
||||||
|
---
|
||||||
|
|
||||||
|
### Issue #5: Validation (Required Fields) + Error Formatting
|
||||||
|
|
||||||
|
**Dependencies:** Issue #4
|
||||||
|
|
||||||
|
**Goal:** Validate each row and return structured, translatable errors.
|
||||||
|
|
||||||
|
**Tasks:**
|
||||||
|
- [ ] Implement `validate_row/3 (row_map, csv_line_number, opts)`
|
||||||
|
- [ ] Required field presence (`first_name`, `last_name`, `email`)
|
||||||
|
- [ ] Email format validation (EctoCommons.EmailValidator)
|
||||||
|
- [ ] Trim values before validation
|
||||||
|
- [ ] Gettext-backed error messages
|
||||||
|
|
||||||
|
---
|
||||||
|
|
||||||
|
### Issue #6: Persistence via Ash Create + Per-Row Error Capture (Chunked Processing)
|
||||||
|
|
||||||
|
**Dependencies:** Issue #5
|
||||||
|
|
||||||
|
**Goal:** Create members and capture errors per row with correct CSV line numbers.
|
||||||
|
|
||||||
|
**Tasks:**
|
||||||
|
- [ ] Implement `process_chunk/3` in service:
|
||||||
|
- Input: `[{csv_line_number, row_map}]`
|
||||||
|
- Validate + create sequentially
|
||||||
|
- Collect counts + first 50 errors (per import overall; LiveView enforces cap across chunks)
|
||||||
|
- [ ] Implement Ash error formatter helper:
|
||||||
|
- Convert `Ash.Error.Invalid` into `%MemberCSV.Error{}`
|
||||||
|
- Prefer field-level errors where possible (attach `field` atom)
|
||||||
|
- Handle unique email constraint error as user-friendly message
|
||||||
|
- [ ] Map row_map to Ash attrs (`%{first_name: ..., ...}`)
|
||||||
|
|
||||||
|
**Important:** **Do not recompute line numbers** in this layer—use the ones provided by the parser.
|
||||||
|
|
||||||
|
---
|
||||||
|
|
||||||
|
### Issue #7: Admin Global Settings LiveView UI (Upload + Start Import + Results + Template Links)
|
||||||
|
|
||||||
|
**Dependencies:** Issue #6
|
||||||
|
|
||||||
|
**Goal:** UI section with upload, progress, results, and template links.
|
||||||
|
|
||||||
|
**Tasks:**
|
||||||
|
- [ ] Render import section only for admins
|
||||||
|
- [ ] Configure `allow_upload/3`:
|
||||||
|
- `.csv` only, `max_entries: 1`, `max_file_size: 10MB`, `auto_upload: false`
|
||||||
|
- [ ] `handle_event("start_import", ...)`:
|
||||||
|
- Admin permission check
|
||||||
|
- Consume upload -> read file content
|
||||||
|
- Call `MemberCSV.prepare/2`
|
||||||
|
- Store `import_state` in assigns (chunks + column_map + metadata)
|
||||||
|
- Initialize progress assigns
|
||||||
|
- `send(self(), {:process_chunk, 0})`
|
||||||
|
- [ ] `handle_info({:process_chunk, idx}, socket)`:
|
||||||
|
- Fetch chunk from `import_state`
|
||||||
|
- Call `MemberCSV.process_chunk/3`
|
||||||
|
- Merge counts/errors into progress assigns (cap errors at 50 overall)
|
||||||
|
- Schedule next chunk (or finish and show results)
|
||||||
|
- [ ] Results UI:
|
||||||
|
- Success count
|
||||||
|
- Failure count
|
||||||
|
- Error list (line number + message + field)
|
||||||
|
|
||||||
|
**Template links:**
|
||||||
|
- Link `/templates/member_import_en.csv` and `/templates/member_import_de.csv` via Phoenix static path helpers.
|
||||||
|
|
||||||
|
---
|
||||||
|
|
||||||
|
### Issue #8: Authorization + Limits
|
||||||
|
|
||||||
|
**Dependencies:** None (can be parallelized)
|
||||||
|
|
||||||
|
**Goal:** Ensure admin-only access and enforce limits.
|
||||||
|
|
||||||
|
**Tasks:**
|
||||||
|
- [ ] Admin check in start import event handler
|
||||||
|
- [ ] File size enforced in upload config
|
||||||
|
- [ ] Row limit enforced in `MemberCSV.prepare/2` (max_rows from config)
|
||||||
|
- [ ] Configuration:
|
||||||
|
```elixir
|
||||||
|
config :mv, csv_import: [
|
||||||
|
max_file_size_mb: 10,
|
||||||
|
max_rows: 1000
|
||||||
|
]
|
||||||
|
```
|
||||||
|
|
||||||
|
---
|
||||||
|
|
||||||
|
### Issue #9: End-to-End LiveView Tests + Fixtures
|
||||||
|
|
||||||
|
**Dependencies:** Issue #7 and #8
|
||||||
|
|
||||||
|
**Tasks:**
|
||||||
|
- [ ] Fixtures:
|
||||||
|
- valid EN/DE
|
||||||
|
- invalid
|
||||||
|
- too many rows (1,001)
|
||||||
|
- BOM + `;` delimiter fixture
|
||||||
|
- fixture with empty line(s) to validate correct line numbers
|
||||||
|
- [ ] LiveView tests:
|
||||||
|
- admin sees section, non-admin does not
|
||||||
|
- upload + start import
|
||||||
|
- success + error rendering
|
||||||
|
- row limit + file size errors
|
||||||
|
|
||||||
|
---
|
||||||
|
|
||||||
|
### Issue #10: Documentation Polish (Inline Help Text + Docs)
|
||||||
|
|
||||||
|
**Dependencies:** Issue #9
|
||||||
|
|
||||||
|
**Tasks:**
|
||||||
|
- [ ] UI help text + translations
|
||||||
|
- [ ] CHANGELOG entry
|
||||||
|
- [ ] Ensure moduledocs/docs
|
||||||
|
|
||||||
|
---
|
||||||
|
|
||||||
|
### Issue #11: Custom Field Import (Optional - v1.1)
|
||||||
|
|
||||||
|
**Dependencies:** Issue #10
|
||||||
|
**Status:** Optional
|
||||||
|
|
||||||
|
*(unchanged — intentionally deferred)*
|
||||||
|
|
||||||
|
---
|
||||||
|
|
||||||
|
## Rollout & Risks
|
||||||
|
|
||||||
|
### Rollout Strategy
|
||||||
|
- Dev → Staging → Production (with anonymized real-world CSV tests)
|
||||||
|
|
||||||
|
### Risks & Mitigations
|
||||||
|
|
||||||
|
| Risk | Impact | Likelihood | Mitigation |
|
||||||
|
|---|---:|---:|---|
|
||||||
|
| Large import timeout | High | Medium | 10 MB + 1,000 rows, chunking via `handle_info` |
|
||||||
|
| Encoding issues | Medium | Medium | BOM stripping, templates with BOM |
|
||||||
|
| Invalid CSV format | Medium | High | Clear errors + templates |
|
||||||
|
| Duplicate emails | Low | High | Ash constraint error -> user-friendly message |
|
||||||
|
| Performance (no background jobs) | Medium | Low | Small limits, sequential chunk processing |
|
||||||
|
| Admin access bypass | High | Low | Event-level auth + UI hiding |
|
||||||
|
| Data corruption | High | Low | Per-row validation + best-effort |
|
||||||
|
|
||||||
|
---
|
||||||
|
|
||||||
|
## Appendix
|
||||||
|
|
||||||
|
### Module File Structure
|
||||||
|
|
||||||
|
```
|
||||||
|
lib/
|
||||||
|
├── mv/
|
||||||
|
│ └── membership/
|
||||||
|
│ └── import/
|
||||||
|
│ ├── member_csv.ex # prepare + process_chunk
|
||||||
|
│ ├── csv_parser.ex # delimiter detection + parsing + BOM handling
|
||||||
|
│ └── header_mapper.ex # normalization + header mapping
|
||||||
|
└── mv_web/
|
||||||
|
└── live/
|
||||||
|
└── global_settings_live.ex # add import section + LV message loop
|
||||||
|
|
||||||
|
priv/
|
||||||
|
└── static/
|
||||||
|
└── templates/
|
||||||
|
├── member_import_en.csv
|
||||||
|
└── member_import_de.csv
|
||||||
|
|
||||||
|
test/
|
||||||
|
├── mv/
|
||||||
|
│ └── membership/
|
||||||
|
│ └── import/
|
||||||
|
│ ├── member_csv_test.exs
|
||||||
|
│ ├── csv_parser_test.exs
|
||||||
|
│ └── header_mapper_test.exs
|
||||||
|
└── fixtures/
|
||||||
|
├── member_import_en.csv
|
||||||
|
├── member_import_de.csv
|
||||||
|
├── member_import_invalid.csv
|
||||||
|
├── member_import_large.csv
|
||||||
|
└── member_import_empty_lines.csv
|
||||||
|
```
|
||||||
|
|
||||||
|
### Example Usage (LiveView)
|
||||||
|
|
||||||
|
```elixir
|
||||||
|
def handle_event("start_import", _params, socket) do
|
||||||
|
assert_admin!(socket.assigns.current_user)
|
||||||
|
|
||||||
|
[{_name, content}] =
|
||||||
|
consume_uploaded_entries(socket, :csv_file, fn %{path: path}, _entry ->
|
||||||
|
{:ok, File.read!(path)}
|
||||||
|
end)
|
||||||
|
|
||||||
|
case Mv.Membership.Import.MemberCSV.prepare(content) do
|
||||||
|
{:ok, import_state} ->
|
||||||
|
socket =
|
||||||
|
socket
|
||||||
|
|> assign(:import_state, import_state)
|
||||||
|
|> assign(:import_progress, %{processed: 0, inserted: 0, failed: 0, errors: []})
|
||||||
|
|> assign(:importing?, true)
|
||||||
|
|
||||||
|
send(self(), {:process_chunk, 0})
|
||||||
|
{:noreply, socket}
|
||||||
|
|
||||||
|
{:error, reason} ->
|
||||||
|
{:noreply, put_flash(socket, :error, reason)}
|
||||||
|
end
|
||||||
|
end
|
||||||
|
|
||||||
|
def handle_info({:process_chunk, idx}, socket) do
|
||||||
|
%{chunks: chunks, column_map: column_map} = socket.assigns.import_state
|
||||||
|
|
||||||
|
case Enum.at(chunks, idx) do
|
||||||
|
nil ->
|
||||||
|
{:noreply, assign(socket, importing?: false)}
|
||||||
|
|
||||||
|
chunk_rows_with_lines ->
|
||||||
|
{:ok, chunk_result} =
|
||||||
|
Mv.Membership.Import.MemberCSV.process_chunk(chunk_rows_with_lines, column_map)
|
||||||
|
|
||||||
|
socket = merge_progress(socket, chunk_result) # caps errors at 50 overall
|
||||||
|
|
||||||
|
send(self(), {:process_chunk, idx + 1})
|
||||||
|
{:noreply, socket}
|
||||||
|
end
|
||||||
|
end
|
||||||
|
```
|
||||||
|
|
||||||
|
---
|
||||||
|
|
||||||
|
**End of Implementation Plan**
|
||||||
Loading…
Add table
Add a link
Reference in a new issue