docs/feature-roadmap.md

@@ -94,15 +94,18 @@
 - ✅ CustomFieldValue type management
 - ✅ Dynamic custom field value assignment to members
 - ✅ Union type storage (JSONB)
+- ✅ Default field visibility configuration
+
+**Closed Issues:**
+- [#194](https://git.local-it.org/local-it/mitgliederverwaltung/issues/194) - Custom Fields: Harden implementation (S)
+- [#197](https://git.local-it.org/local-it/mitgliederverwaltung/issues/197) - Custom Fields: Add option to show custom fields in member overview (M)
 
 **Open Issues:**
-- [#194](https://git.local-it.org/local-it/mitgliederverwaltung/issues/194) - Custom Fields: Harden implementation (S) [0/3 tasks]
 - [#157](https://git.local-it.org/local-it/mitgliederverwaltung/issues/157) - Concept how custom fields are handled (M, High priority) [0/4 tasks]
 - [#161](https://git.local-it.org/local-it/mitgliederverwaltung/issues/161) - Don't show birthday field for default configurations (S, Low priority)
 - [#153](https://git.local-it.org/local-it/mitgliederverwaltung/issues/153) - Sorting functionalities for custom fields (M, Low priority)
 
 **Missing Features:**
-- ❌ Default field visibility configuration
 - ❌ Field groups/categories
 - ❌ Conditional fields (show field X if field Y = value)
 - ❌ Field validation rules (min/max, regex patterns)

lib/mv_web/live/custom_field_live/form.ex

@@ -18,6 +18,7 @@ defmodule MvWeb.CustomFieldLive.Form do
   - description - Human-readable explanation
   - immutable - If true, values cannot be changed after creation (default: false)
   - required - If true, all members must have this custom field (default: false)
+  - show_in_overview - If true, this custom field will be displayed in the member overview table (default: true)
 
   ## Value Type Selection
   - `:string` - Text data (unlimited length)
@@ -60,6 +61,7 @@ defmodule MvWeb.CustomFieldLive.Form do
         <.input field={@form[:description]} type="text" label={gettext("Description")} />
         <.input field={@form[:immutable]} type="checkbox" label={gettext("Immutable")} />
         <.input field={@form[:required]} type="checkbox" label={gettext("Required")} />
+        <.input field={@form[:show_in_overview]} type="checkbox" label={gettext("Show in overview")} />
 
         <.button phx-disable-with={gettext("Saving...")} variant="primary">
           {gettext("Save Custom field")}

lib/mv_web/live/member_live/index.ex

@@ -26,6 +26,11 @@ defmodule MvWeb.MemberLive.Index do
   """
   use MvWeb, :live_view
 
+  alias MvWeb.MemberLive.Index.Formatter
+
+  # Prefix used in sort field names for custom fields (e.g., "custom_field_<id>")
+  @custom_field_prefix "custom_field_"
+
   @doc """
   Initializes the LiveView state.
 
@@ -34,6 +39,19 @@ defmodule MvWeb.MemberLive.Index do
   """
   @impl true
   def mount(_params, _session, socket) do
+    # Load custom fields that should be shown in overview
+    require Ash.Query
+    import Ash.Expr
+
+    # Note: Using Ash.read! (bang version) - errors will be handled by Phoenix LiveView
+    # and result in a 500 error page. This is appropriate for LiveViews where errors
+    # should be visible to the user rather than silently failing.
+    custom_fields_visible =
+      Mv.Membership.CustomField
+      |> Ash.Query.filter(expr(show_in_overview == true))
+      |> Ash.Query.sort(name: :asc)
+      |> Ash.read!()
+
     socket =
       socket
       |> assign(:page_title, gettext("Members"))
@@ -41,6 +59,7 @@ defmodule MvWeb.MemberLive.Index do
       |> assign_new(:sort_field, fn -> :first_name end)
       |> assign_new(:sort_order, fn -> :asc end)
       |> assign(:selected_members, [])
+      |> assign(:custom_fields_visible, custom_fields_visible)
 
     # We call handle params to use the query from the URL
     {:ok, socket}
@@ -60,6 +79,8 @@ defmodule MvWeb.MemberLive.Index do
   """
   @impl true
   def handle_event("delete", %{"id" => id}, socket) do
+    # Note: Using bang versions (!) - errors will be handled by Phoenix LiveView
+    # This ensures users see error messages if deletion fails (e.g., permission denied)
     member = Ash.get!(Mv.Membership.Member, id)
     Ash.destroy!(member)
 
@@ -108,7 +129,14 @@ defmodule MvWeb.MemberLive.Index do
   """
   @impl true
   def handle_info({:sort, field_str}, socket) do
-    field = String.to_existing_atom(field_str)
+    # Handle both atom and string field names (for custom fields)
+    field =
+      try do
+        String.to_existing_atom(field_str)
+      rescue
+        ArgumentError -> field_str
+      end
+
     {new_field, new_order} = determine_new_sort(field, socket)
 
     socket
@@ -158,10 +186,37 @@ defmodule MvWeb.MemberLive.Index do
       |> maybe_update_search(params)
       |> maybe_update_sort(params)
       |> load_members(params["query"])
+      |> prepare_dynamic_cols()
 
     {:noreply, socket}
   end
 
+  # Prepares dynamic column definitions for custom fields that should be shown in the overview.
+  #
+  # Creates a list of column definitions, each containing:
+  # - `:custom_field` - The CustomField resource
+  # - `:render` - A function that formats the custom field value for a given member
+  #
+  # Returns the socket with `:dynamic_cols` assigned.
+  defp prepare_dynamic_cols(socket) do
+    dynamic_cols =
+      Enum.map(socket.assigns.custom_fields_visible, fn custom_field ->
+        %{
+          custom_field: custom_field,
+          render: fn member ->
+            case get_custom_field_value(member, custom_field) do
+              nil -> ""
+              cfv ->
+                formatted = Formatter.format_custom_field_value(cfv.value, custom_field)
+                if formatted == "", do: "", else: formatted
+            end
+          end
+        }
+      end)
+
+    assign(socket, :dynamic_cols, dynamic_cols)
+  end
+
   # -------------------------------------------------------------
   # FUNCTIONS
   # -------------------------------------------------------------
@@ -177,8 +232,8 @@ defmodule MvWeb.MemberLive.Index do
 
   # Updates both the active and old SortHeader components
   defp update_sort_components(socket, old_field, new_field, new_order) do
-    active_id = :"sort_#{new_field}"
-    old_id = :"sort_#{old_field}"
+    active_id = to_sort_id(new_field)
+    old_id = to_sort_id(old_field)
 
     # Update the new SortHeader
     send_update(MvWeb.Components.SortHeaderComponent,
@@ -197,11 +252,32 @@ defmodule MvWeb.MemberLive.Index do
     socket
   end
 
+  # Converts a field (atom or string) to a sort component ID atom
+  # Handles both existing atoms and strings that need to be converted
+  defp to_sort_id(field) when is_binary(field) do
+    try do
+      String.to_existing_atom("sort_#{field}")
+    rescue
+      ArgumentError -> :"sort_#{field}"
+    end
+  end
+
+  defp to_sort_id(field) when is_atom(field) do
+    :"sort_#{field}"
+  end
+
   # Builds sort URL and pushes navigation patch
   defp push_sort_url(socket, field, order) do
+    field_str =
+      if is_atom(field) do
+        Atom.to_string(field)
+      else
+        field
+      end
+
     query_params = %{
       "query" => socket.assigns.query,
-      "sort_field" => Atom.to_string(field),
+      "sort_field" => field_str,
       "sort_order" => Atom.to_string(order)
     }
 
@@ -214,7 +290,25 @@ defmodule MvWeb.MemberLive.Index do
      )}
   end
 
-  # Load members eg based on a query for sorting
+  # Loads members from the database with custom field values and applies search/sort filters.
+  #
+  # Process:
+  # 1. Builds base query with selected fields
+  # 2. Loads custom field values for visible custom fields
+  # 3. Applies search filter if provided
+  # 4. Applies sorting (database-level for regular fields, in-memory for custom fields)
+  # 5. Filters custom field values to only visible ones (reduces memory usage)
+  #
+  # Performance Considerations:
+  # - In-memory sorting: Custom field sorting is done in memory after loading.
+  #   This is suitable for small to medium datasets (<1000 members).
+  #   For larger datasets, consider implementing database-level sorting or pagination.
+  # - Memory filtering: Custom field values are filtered after loading to reduce
+  #   memory usage, but all members are still loaded into memory.
+  # - No pagination: All matching members are loaded at once. For large result sets,
+  #   consider implementing pagination (see Issue #165).
+  #
+  # Returns the socket with `:members` assigned.
   defp load_members(socket, search_query) do
     query =
       Mv.Membership.Member
@@ -232,16 +326,61 @@ defmodule MvWeb.MemberLive.Index do
         :join_date
       ])
 
+    # Load custom field values for visible custom fields
+    custom_field_ids = Enum.map(socket.assigns.custom_fields_visible, & &1.id)
+    query = load_custom_field_values(query, custom_field_ids)
+
     # Apply the search filter first
     query = apply_search_filter(query, search_query)
 
     # Apply sorting based on current socket state
-    query = maybe_sort(query, socket.assigns.sort_field, socket.assigns.sort_order)
+    # For custom fields, we sort after loading
+    {query, sort_after_load} = maybe_sort(query, socket.assigns.sort_field, socket.assigns.sort_order, socket.assigns.custom_fields_visible)
 
+    # Note: Using Ash.read! - errors will be handled by Phoenix LiveView
+    # This is appropriate for data loading in LiveViews
     members = Ash.read!(query)
+
+    # Filter custom field values to only visible ones (reduces memory usage)
+    # Performance: This iterates through all members and their custom_field_values.
+    # For large datasets (>1000 members), this could be optimized by filtering
+    # at the database level, but requires more complex Ash queries.
+    custom_field_ids = MapSet.new(Enum.map(socket.assigns.custom_fields_visible, & &1.id))
+    members = Enum.map(members, fn member ->
+      # Only filter if custom_field_values is loaded (is a list, not Ash.NotLoaded)
+      if is_list(member.custom_field_values) do
+        filtered_values = Enum.filter(member.custom_field_values, fn cfv ->
+          cfv.custom_field_id in custom_field_ids
+        end)
+        %{member | custom_field_values: filtered_values}
+      else
+        member
+      end
+    end)
+
+    # Sort in memory if needed (for custom fields)
+    members = if sort_after_load do
+      sort_members_in_memory(members, socket.assigns.sort_field, socket.assigns.sort_order, socket.assigns.custom_fields_visible)
+    else
+      members
+    end
+
     assign(socket, :members, members)
   end
 
+  # Load custom field values for the given custom field IDs
+  defp load_custom_field_values(query, []) do
+    query
+  end
+
+  defp load_custom_field_values(query, custom_field_ids) when length(custom_field_ids) > 0 do
+    # Load all custom field values with their custom_field relationship
+    # Note: We filter to visible custom fields after loading to reduce memory usage
+    # Ash loads relationships efficiently with JOINs, but we only keep visible ones
+    query
+    |> Ash.Query.load(custom_field_values: [custom_field: [:id, :name, :value_type]])
+  end
+
   # -------------------------------------------------------------
   # Helper Functions
   # -------------------------------------------------------------
@@ -264,15 +403,24 @@ defmodule MvWeb.MemberLive.Index do
   defp toggle_order(nil), do: :asc
 
   # Function to sort the column if needed
-  defp maybe_sort(query, nil, _), do: query
+  # Returns {query, sort_after_load} where sort_after_load is true if we need to sort in memory
+  defp maybe_sort(query, nil, _, _), do: {query, false}
 
-  defp maybe_sort(query, field, :asc) when not is_nil(field),
-    do: Ash.Query.sort(query, [{field, :asc}])
+  defp maybe_sort(query, field, order, _custom_fields) when not is_nil(field) do
+    if custom_field_sort?(field) do
+      # Custom fields need to be sorted in memory after loading
+      {query, true}
+    else
+      # Only sort by atom fields (regular member fields) in database
+      if is_atom(field) do
+        {Ash.Query.sort(query, [{field, order}]), false}
+      else
+        {query, false}
+      end
+    end
+  end
 
-  defp maybe_sort(query, field, :desc) when not is_nil(field),
-    do: Ash.Query.sort(query, [{field, :desc}])
-
-  defp maybe_sort(query, _, _), do: query
+  defp maybe_sort(query, _, _, _), do: {query, false}
 
   # Validate that a field is sortable
   defp valid_sort_field?(field) when is_atom(field) do
@@ -288,12 +436,156 @@ defmodule MvWeb.MemberLive.Index do
       :join_date
     ]
 
-    field in valid_fields
+    field in valid_fields or custom_field_sort?(field)
+  end
+
+  defp valid_sort_field?(field) when is_binary(field) do
+    custom_field_sort?(field)
   end
 
   defp valid_sort_field?(_), do: false
 
-  # Function to maybe update the sort
+  # Check if field is a custom field sort field (format: custom_field_<id>)
+  defp custom_field_sort?(field) when is_atom(field) do
+    field_str = Atom.to_string(field)
+    String.starts_with?(field_str, @custom_field_prefix)
+  end
+
+  defp custom_field_sort?(field) when is_binary(field) do
+    String.starts_with?(field, @custom_field_prefix)
+  end
+
+  defp custom_field_sort?(_), do: false
+
+  # Extracts the custom field ID from a sort field name.
+  #
+  # Sort fields for custom fields use the format: "custom_field_<id>"
+  # This function extracts the ID part.
+  #
+  # Examples:
+  #   extract_custom_field_id("custom_field_123") -> "123"
+  #   extract_custom_field_id(:custom_field_123) -> "123"
+  #   extract_custom_field_id("first_name") -> nil
+  defp extract_custom_field_id(field) when is_atom(field) do
+    field_str = Atom.to_string(field)
+    extract_custom_field_id(field_str)
+  end
+
+  defp extract_custom_field_id(field) when is_binary(field) do
+    case String.split(field, @custom_field_prefix) do
+      ["", id_str] -> id_str
+      _ -> nil
+    end
+  end
+
+  defp extract_custom_field_id(_), do: nil
+
+  # Sorts members in memory by a custom field value.
+  #
+  # Process:
+  # 1. Extracts custom field ID from sort field name
+  # 2. Finds the corresponding CustomField resource
+  # 3. Splits members into those with values and those without
+  # 4. Sorts members with values by the extracted value
+  # 5. Combines: sorted values first, then NULL/empty values at the end
+  #
+  # Performance Note:
+  # This function sorts in memory, which is suitable for small to medium datasets (<1000 members).
+  # For larger datasets, consider implementing database-level sorting or pagination.
+  #
+  # Parameters:
+  # - `members` - List of Member resources to sort
+  # - `field` - Sort field name (format: "custom_field_<id>" or atom)
+  # - `order` - Sort order (`:asc` or `:desc`)
+  # - `custom_fields` - List of visible CustomField resources
+  #
+  # Returns the sorted list of members.
+  defp sort_members_in_memory(members, field, order, custom_fields) do
+    custom_field_id_str = extract_custom_field_id(field)
+
+    case custom_field_id_str do
+      nil ->
+        members
+
+      id_str ->
+        # Find the custom field by matching the ID string
+        custom_field =
+          Enum.find(custom_fields, fn cf ->
+            to_string(cf.id) == id_str
+          end)
+
+        case custom_field do
+          nil ->
+            members
+
+          cf ->
+            # Split members into those with values and those without (NULL/empty)
+            {members_with_values, members_without_values} =
+              Enum.split_with(members, fn member ->
+                case get_custom_field_value(member, cf) do
+                  nil -> false
+                  cfv ->
+                    extracted = extract_sort_value(cfv.value, cf.value_type)
+                    not is_empty_value(extracted, cf.value_type)
+                end
+              end)
+
+            # Sort members with values
+            sorted_with_values = Enum.sort_by(members_with_values, fn member ->
+              cfv = get_custom_field_value(member, cf)
+              extracted = extract_sort_value(cfv.value, cf.value_type)
+              normalize_sort_value(extracted, order)
+            end)
+
+            # For DESC, reverse only the members with values
+            sorted_with_values = if order == :desc do
+              Enum.reverse(sorted_with_values)
+            else
+              sorted_with_values
+            end
+
+            # Combine: sorted values first, then NULL/empty values at the end
+            sorted_with_values ++ members_without_values
+        end
+    end
+  end
+
+  # Extracts a sortable value from a custom field value based on its type.
+  #
+  # Handles different value formats:
+  # - `%Ash.Union{}` - Extracts value and type from union
+  # - Direct values - Returns as-is for primitive types
+  #
+  # Returns the extracted value suitable for sorting.
+  defp extract_sort_value(%Ash.Union{value: value, type: type}, _expected_type) do
+    extract_sort_value(value, type)
+  end
+
+  defp extract_sort_value(value, :string) when is_binary(value), do: value
+  defp extract_sort_value(value, :integer) when is_integer(value), do: value
+  defp extract_sort_value(value, :boolean) when is_boolean(value), do: value
+  defp extract_sort_value(%Date{} = date, :date), do: date
+  defp extract_sort_value(value, :email) when is_binary(value), do: value
+  defp extract_sort_value(value, _type), do: to_string(value)
+
+  # Check if a value is considered empty (NULL or empty string)
+  defp is_empty_value(value, :string) when is_binary(value) do
+    String.trim(value) == ""
+  end
+  defp is_empty_value(value, :email) when is_binary(value) do
+    String.trim(value) == ""
+  end
+  defp is_empty_value(_value, _type), do: false
+
+  # Normalize sort value for DESC order
+  # For DESC, we sort ascending first, then reverse the list
+  # This function is kept for consistency but doesn't need to invert values
+  defp normalize_sort_value(value, _order), do: value
+
+
+  # Updates sort field and order from URL parameters if present.
+  #
+  # Validates the sort field and order, falling back to defaults if invalid.
   defp maybe_update_sort(socket, %{"sort_field" => sf, "sort_order" => so}) do
     field = determine_field(socket.assigns.sort_field, sf)
     order = determine_order(socket.assigns.sort_order, so)
@@ -305,33 +597,50 @@ defmodule MvWeb.MemberLive.Index do
 
   defp maybe_update_sort(socket, _), do: socket
 
-  defp determine_field(default, sf) do
-    case sf do
-      "" ->
-        default
+  # Determine sort field from URL parameter, validating against allowed fields
+  defp determine_field(default, ""), do: default
+  defp determine_field(default, nil), do: default
 
-      nil ->
-        default
-
-      sf when is_binary(sf) ->
-        sf
-        |> String.to_existing_atom()
-        |> handle_atom_conversion(default)
-
-      sf when is_atom(sf) ->
-        handle_atom_conversion(sf, default)
-
-      _ ->
-        default
+  # Determines the valid sort field from a URL parameter.
+  #
+  # Validates the field against allowed sort fields (regular member fields or custom fields).
+  # Falls back to default if the field is invalid.
+  #
+  # Parameters:
+  # - `default` - Default field to use if validation fails
+  # - `sf` - Sort field from URL (can be atom, string, nil, or empty string)
+  #
+  # Returns a valid sort field (atom or string for custom fields).
+  defp determine_field(default, sf) when is_binary(sf) do
+    # Check if it's a custom field sort (starts with "custom_field_")
+    if custom_field_sort?(sf) do
+      if valid_sort_field?(sf), do: sf, else: default
+    else
+      # Try to convert to atom for regular fields
+      try do
+        atom = String.to_existing_atom(sf)
+        if valid_sort_field?(atom), do: atom, else: default
+      rescue
+        ArgumentError -> default
+      end
     end
   end
 
-  defp handle_atom_conversion(val, default) when is_atom(val) do
-    if valid_sort_field?(val), do: val, else: default
+  defp determine_field(default, sf) when is_atom(sf) do
+    if valid_sort_field?(sf), do: sf, else: default
   end
 
-  defp handle_atom_conversion(_, default), do: default
+  defp determine_field(default, _), do: default
 
+  # Determines the valid sort order from a URL parameter.
+  #
+  # Validates that the order is either "asc" or "desc", falling back to default if invalid.
+  #
+  # Parameters:
+  # - `default` - Default order to use if validation fails
+  # - `so` - Sort order from URL (string, atom, nil, or empty string)
+  #
+  # Returns `:asc` or `:desc`.
   defp determine_order(default, so) do
     case so do
       "" -> default
@@ -350,4 +659,32 @@ defmodule MvWeb.MemberLive.Index do
     # Keep the previous search query if no new one is provided
     socket
   end
+
+  # -------------------------------------------------------------
+  # Helper Functions for Custom Field Values
+  # -------------------------------------------------------------
+
+  # Retrieves the custom field value for a specific member and custom field.
+  #
+  # Searches through the member's `custom_field_values` relationship to find
+  # the value matching the given custom field.
+  #
+  # Returns:
+  # - `%CustomFieldValue{}` if found
+  # - `nil` if not found or if member has no custom field values
+  #
+  # Examples:
+  #   get_custom_field_value(member, custom_field) -> %CustomFieldValue{...}
+  #   get_custom_field_value(member, non_existent_field) -> nil
+  def get_custom_field_value(member, custom_field) do
+    case member.custom_field_values do
+      nil -> nil
+      values when is_list(values) ->
+        Enum.find(values, fn cfv ->
+          cfv.custom_field_id == custom_field.id or
+            (cfv.custom_field && cfv.custom_field.id == custom_field.id)
+        end)
+      _ -> nil
+    end
+  end
 end

lib/mv_web/live/member_live/index.html.heex

@@ -19,6 +19,9 @@
     id="members"
     rows={@members}
     row_click={fn member -> JS.navigate(~p"/members/#{member}") end}
+    dynamic_cols={@dynamic_cols}
+    sort_field={@sort_field}
+    sort_order={@sort_order}
   >
     
 <!-- <:col :let={member} label="Id">{member.id}</:col> -->
@@ -185,7 +188,6 @@
     >
       {member.join_date}
     </:col>
-
     <:action :let={member}>
       <div class="sr-only">
         <.link navigate={~p"/members/#{member}"}>{gettext("Show")}</.link>

lib/mv_web/live/member_live/index/formatter.ex

@@ -0,0 +1,78 @@
+defmodule MvWeb.MemberLive.Index.Formatter do
+  @moduledoc """
+  Formats custom field values for display in the member overview table.
+
+  Handles different value types (string, integer, boolean, date, email) and
+  formats them appropriately for display in the UI.
+  """
+  use Gettext, backend: MvWeb.Gettext
+
+  @doc """
+  Formats a custom field value for display.
+
+  Handles different input formats:
+  - `nil` - Returns empty string
+  - `%Ash.Union{}` - Extracts value and type from union type
+  - Map (JSONB format) - Extracts type and value from map keys
+  - Direct value - Uses custom_field.value_type to determine format
+
+  ## Examples
+
+      iex> format_custom_field_value(nil, %CustomField{value_type: :string})
+      ""
+
+      iex> format_custom_field_value("test", %CustomField{value_type: :string})
+      "test"
+
+      iex> format_custom_field_value(true, %CustomField{value_type: :boolean})
+      "Yes"
+  """
+  def format_custom_field_value(nil, _custom_field), do: ""
+
+  def format_custom_field_value(%Ash.Union{value: value, type: type}, custom_field) do
+    format_value_by_type(value, type, custom_field)
+  end
+
+  def format_custom_field_value(value, custom_field) when is_map(value) do
+    # Handle map format from JSONB
+    type = Map.get(value, "type") || Map.get(value, "_union_type")
+    val = Map.get(value, "value") || Map.get(value, "_union_value")
+    format_value_by_type(val, type, custom_field)
+  end
+
+  def format_custom_field_value(value, custom_field) do
+    format_value_by_type(value, custom_field.value_type, custom_field)
+  end
+
+  # Format value based on type
+  defp format_value_by_type(value, :string, _) when is_binary(value) do
+    # Return empty string if value is empty, otherwise return the value
+    if String.trim(value) == "", do: "", else: value
+  end
+
+  defp format_value_by_type(value, :string, _), do: to_string(value)
+
+  defp format_value_by_type(value, :integer, _), do: to_string(value)
+
+  defp format_value_by_type(value, :email, _) when is_binary(value) do
+    # Return empty string if value is empty
+    if String.trim(value) == "", do: "", else: value
+  end
+
+  defp format_value_by_type(value, :email, _), do: to_string(value)
+
+  defp format_value_by_type(value, :boolean, _) when value == true, do: gettext("Yes")
+  defp format_value_by_type(value, :boolean, _) when value == false, do: gettext("No")
+  defp format_value_by_type(value, :boolean, _), do: to_string(value)
+
+  defp format_value_by_type(%Date{} = date, :date, _), do: Date.to_string(date)
+
+  defp format_value_by_type(value, :date, _) when is_binary(value) do
+    case Date.from_iso8601(value) do
+      {:ok, date} -> Date.to_string(date)
+      _ -> value
+    end
+  end
+
+  defp format_value_by_type(value, _type, _), do: to_string(value)
+end