improvement: support for unions

closes ash-project#145

dev/repo/migrations/20240516215427_migrate_resources6.exs

@@ -0,0 +1,47 @@
+defmodule Demo.Repo.Migrations.MigrateResources6 do
+  @moduledoc """
+  Updates resources based on their most recent snapshots.
+
+  This file was autogenerated with `mix ash_postgres.generate_migrations`
+  """
+
+  use Ecto.Migration
+
+  def up do
+    drop_if_exists(
+      unique_index(:users, [:id, :first_name, :last_name],
+        name: "users_representative_name_index"
+      )
+    )
+
+    create(
+      unique_index(:users, [:org, :first_name, :last_name],
+        where: "representative = true",
+        name: "users_representative_name_index"
+      )
+    )
+
+    alter table(:tickets) do
+      add(:metadata, :map)
+    end
+  end
+
+  def down do
+    alter table(:tickets) do
+      remove(:metadata)
+    end
+
+    drop_if_exists(
+      unique_index(:users, [:org, :first_name, :last_name],
+        name: "users_representative_name_index"
+      )
+    )
+
+    create(
+      unique_index(:users, [:org, :first_name, :last_name],
+        where: "representative = true",
+        name: "users_representative_name_index"
+      )
+    )
+  end
+end

dev/resource_snapshots/repo/tickets/20240516215427.json

@@ -0,0 +1,183 @@
+{
+  "attributes": [
+    {
+      "default": "fragment(\"gen_random_uuid()\")",
+      "size": null,
+      "type": "uuid",
+      "source": "id",
+      "references": null,
+      "allow_nil?": false,
+      "primary_key?": true,
+      "generated?": false
+    },
+    {
+      "default": "nil",
+      "size": null,
+      "type": "text",
+      "source": "subject",
+      "references": null,
+      "allow_nil?": false,
+      "primary_key?": false,
+      "generated?": false
+    },
+    {
+      "default": "nil",
+      "size": null,
+      "type": "map",
+      "source": "metadata",
+      "references": null,
+      "allow_nil?": true,
+      "primary_key?": false,
+      "generated?": false
+    },
+    {
+      "default": "nil",
+      "size": null,
+      "type": "text",
+      "source": "description",
+      "references": null,
+      "allow_nil?": true,
+      "primary_key?": false,
+      "generated?": false
+    },
+    {
+      "default": "nil",
+      "size": null,
+      "type": "text",
+      "source": "response",
+      "references": null,
+      "allow_nil?": true,
+      "primary_key?": false,
+      "generated?": false
+    },
+    {
+      "default": "\"new\"",
+      "size": null,
+      "type": "text",
+      "source": "status",
+      "references": null,
+      "allow_nil?": false,
+      "primary_key?": false,
+      "generated?": false
+    },
+    {
+      "default": "fragment(\"(now() AT TIME ZONE 'utc')\")",
+      "size": null,
+      "type": "utc_datetime_usec",
+      "source": "inserted_at",
+      "references": null,
+      "allow_nil?": false,
+      "primary_key?": false,
+      "generated?": false
+    },
+    {
+      "default": "fragment(\"(now() AT TIME ZONE 'utc')\")",
+      "size": null,
+      "type": "utc_datetime_usec",
+      "source": "updated_at",
+      "references": null,
+      "allow_nil?": false,
+      "primary_key?": false,
+      "generated?": false
+    },
+    {
+      "default": "nil",
+      "size": null,
+      "type": "uuid",
+      "source": "reporter_id",
+      "references": {
+        "name": "tickets_reporter_id_fkey",
+        "table": "users",
+        "destination_attribute": "id",
+        "primary_key?": true,
+        "schema": "public",
+        "multitenancy": {
+          "global": null,
+          "attribute": null,
+          "strategy": null
+        },
+        "on_delete": null,
+        "on_update": null,
+        "deferrable": false,
+        "match_with": null,
+        "match_type": null,
+        "destination_attribute_default": null,
+        "destination_attribute_generated": null
+      },
+      "allow_nil?": true,
+      "primary_key?": false,
+      "generated?": false
+    },
+    {
+      "default": "nil",
+      "size": null,
+      "type": "uuid",
+      "source": "representative_id",
+      "references": {
+        "name": "tickets_representative_id_fkey",
+        "table": "users",
+        "destination_attribute": "id",
+        "primary_key?": true,
+        "schema": "public",
+        "multitenancy": {
+          "global": null,
+          "attribute": null,
+          "strategy": null
+        },
+        "on_delete": null,
+        "on_update": null,
+        "deferrable": false,
+        "match_with": null,
+        "match_type": null,
+        "destination_attribute_default": null,
+        "destination_attribute_generated": null
+      },
+      "allow_nil?": true,
+      "primary_key?": false,
+      "generated?": false
+    },
+    {
+      "default": "nil",
+      "size": null,
+      "type": "uuid",
+      "source": "organization_id",
+      "references": {
+        "name": "tickets_organization_id_fkey",
+        "table": "organizations",
+        "destination_attribute": "id",
+        "primary_key?": true,
+        "schema": "public",
+        "multitenancy": {
+          "global": null,
+          "attribute": null,
+          "strategy": null
+        },
+        "on_delete": null,
+        "on_update": null,
+        "deferrable": false,
+        "match_with": null,
+        "match_type": null,
+        "destination_attribute_default": null,
+        "destination_attribute_generated": null
+      },
+      "allow_nil?": false,
+      "primary_key?": false,
+      "generated?": false
+    }
+  ],
+  "table": "tickets",
+  "hash": "24D2DA4ADA475CF4B05D30CF592EAB2C5978B4DBFE4A65CCE0F9CCB793526262",
+  "repo": "Elixir.Demo.Repo",
+  "schema": null,
+  "check_constraints": [],
+  "identities": [],
+  "custom_indexes": [],
+  "multitenancy": {
+    "global": null,
+    "attribute": null,
+    "strategy": null
+  },
+  "base_filter": null,
+  "custom_statements": [],
+  "has_create_action": true
+}