feat(member). added search action to ressource

lib/membership/member.ex

@@ -3,6 +3,11 @@ defmodule Mv.Membership.Member do
     domain: Mv.Membership,
     data_layer: AshPostgres.DataLayer
 
+  require Ash.Query
+  import Ash.Expr
+
+  @default_fields [:first_name, :last_name, :email, :phone_number, :city, :street, :house_number, :postal_code]
+
   postgres do
     table "members"
     repo Mv.Repo
@@ -108,6 +113,47 @@ defmodule Mv.Membership.Member do
         where [changing(:user)]
       end
     end
+
+    read :search do
+      argument :query, :string, allow_nil?: true
+      argument :fields, {:array, :atom}, allow_nil?: true
+      argument :similarity_threshold, :float, allow_nil?: true
+
+      prepare fn query, _ctx ->
+        q = Ash.Query.get_argument(query, :query) || ""
+        fields = Ash.Query.get_argument(query, :fields) || @default_fields
+        threshold = Ash.Query.get_argument(query, :similarity_threshold) || 0.2
+
+        if is_binary(q) and String.trim(q) != "" do
+          q2 = String.trim(q)
+          pat = "%" <> q2 <> "%"
+
+          # FTS as main filter and fuzzy search just fo first name, last name and strees
+          query
+          |> Ash.Query.filter(
+            expr(
+              fragment("search_vector @@ websearch_to_tsquery('simple', ?)", ^q2) or
+                fragment("search_vector @@ plainto_tsquery('simple', ?)", ^q2) or
+                # Substring on numeric-like fields (best effort, supports middle substrings)
+                contains(postal_code, ^q2) or
+                contains(house_number, ^q2) or
+                contains(phone_number, ^q2) or
+                fragment("? % first_name", ^q2) or
+                fragment("? % last_name", ^q2) or
+                fragment("? % street", ^q2) or
+                fragment("word_similarity(?, first_name) > ?", ^q2, ^threshold) or
+                fragment("word_similarity(?, last_name) > ?", ^q2, ^threshold) or
+                fragment("word_similarity(?, street) > ?", ^q2, ^threshold) or
+                fragment("similarity(first_name, ?) > ?", ^q2, ^threshold) or
+                fragment("similarity(last_name, ?) > ?", ^q2, ^threshold) or
+                fragment("similarity(street, ?) > ?", ^q2, ^threshold)
+            )
+          )
+        else
+          query
+        end
+      end
+    end
   end
 
   validations do
@@ -281,4 +327,21 @@ defmodule Mv.Membership.Member do
   identities do
     identity :unique_email, [:email]
   end
+
+  # Fuzzy Search function that can be called by live view and calls search action
+  def fuzzy_search(query, opts) do
+    q = (opts[:query] || opts["query"] || "") |> to_string()
+
+    if String.trim(q) == "" do
+      query
+    else
+      args =
+        case (opts[:fields] || opts["fields"]) do
+          nil -> %{query: q}
+          fields -> %{query: q, fields: fields}
+        end
+
+      Ash.Query.for_read(query, :search, args)
+    end
+  end
 end