feat: add source option to attributes

.formatter.exs

@@ -109,6 +109,7 @@ locals_without_parens = [
   sensitive?: 1,
   soft?: 1,
   sort: 1,
+  source: 1,
   source_field: 1,
   source_field_on_join_table: 1,
   strategy: 1,

lib/ash/resource/attribute.ex

@@ -13,6 +13,7 @@ defmodule Ash.Resource.Attribute do
     :default,
     :update_default,
     :description,
+    :source,
     sensitive?: false,
     filterable?: true,
     constraints: []
@@ -52,6 +53,12 @@ defmodule Ash.Resource.Attribute do
       doc:
         "Whether or not the attribute value contains sensitive information, like PII. If so, it will be redacted while inspecting data."
     ],
+    source: [
+      type: :atom,
+      doc: """
+      If the field should be mapped to a different name in the data layer.
+      """
+    ],
     always_select?: [
       type: :boolean,
       default: false,

lib/ash/resource/schema.ex

@@ -33,7 +33,8 @@ defmodule Ash.Schema do
                 constraint_opts,
                 primary_key: attribute.primary_key?,
                 read_after_writes: read_after_writes?,
-                redact: attribute.sensitive?
+                redact: attribute.sensitive?,
+                source: attribute.source
               )
             )
           end
@@ -120,7 +121,8 @@ defmodule Ash.Schema do
                 constraint_opts,
                 primary_key: attribute.primary_key?,
                 read_after_writes: read_after_writes?,
-                redact: attribute.sensitive?
+                redact: attribute.sensitive?,
+                source: attribute.source
               )
             )
           end

lib/ash/resource/transformers/set_types.ex

@@ -25,7 +25,12 @@ defmodule Ash.Resource.Transformers.SetTypes do
             Transformer.replace_entity(
               dsl_state,
               [:attributes],
-              %{attribute | type: type, constraints: constraints},
+              %{
+                attribute
+                | type: type,
+                  constraints: constraints,
+                  source: attribute.source || attribute.name
+              },
               fn replacing ->
                 replacing.name == attribute.name
               end