feat: support alias in matcher define_enum (#1419)

lib/shoulda/matchers/active_record/define_enum_for_matcher.rb

@@ -6,16 +6,22 @@ module ActiveRecord
       #
       #     class Process < ActiveRecord::Base
       #       enum status: [:running, :stopped, :suspended]
+      #
+      #       alias_attribute :kind, :SomeLegacyField
+      #
+      #       enum kind: [:foo, :bar]
       #     end
       #
       #     # RSpec
       #     RSpec.describe Process, type: :model do
       #       it { should define_enum_for(:status) }
+      #       it { should define_enum_for(:kind) }
       #     end
       #
       #     # Minitest (Shoulda)
       #     class ProcessTest < ActiveSupport::TestCase
       #       should define_enum_for(:status)
+      #       should define_enum_for(:kind)
       #     end
       #
       # #### Qualifiers
@@ -370,7 +376,10 @@ def expected_column_type
         end
 
         def column
-          model.columns_hash[attribute_name.to_s]
+          key = attribute_name.to_s
+          column_name = model.attribute_alias(key) || key
+
+          model.columns_hash[column_name]
         end
 
         def model

spec/unit/shoulda/matchers/active_record/define_enum_for_matcher_spec.rb

@@ -796,13 +796,27 @@ def self.statuses
     end
   end
 
+  context 'if the attribute is defined as an enum but is an alias' do
+    it 'matches' do
+      record = build_record_with_array_values(attribute_name: :attr, attribute_alias: :attr_alias)
+
+      expect { define_enum_for(:attr_alias) }.
+        to match_against(record).
+        or_fail_with(<<-MESSAGE, wrap: true)
+          Expected Example not to define :attr_alias as an enum backed by an
+          integer, but it did.
+        MESSAGE
+    end
+  end
+
   def build_record_with_array_values(
     model_name: 'Example',
     attribute_name: :attr,
     column_type: :integer,
     values: ['published', 'unpublished', 'draft'],
     prefix: false,
-    suffix: false
+    suffix: false,
+    attribute_alias: nil
   )
     build_record_with_enum_attribute(
       model_name: model_name,
@@ -811,6 +825,7 @@ def build_record_with_array_values(
       values: values,
       prefix: prefix,
       suffix: suffix,
+      attribute_alias: attribute_alias,
     )
   end
 
@@ -828,6 +843,7 @@ def build_record_with_hash_values(
       values: values,
       prefix: prefix,
       suffix: suffix,
+      attribute_alias: nil,
     )
   end
 
@@ -836,18 +852,22 @@ def build_record_with_enum_attribute(
     attribute_name:,
     column_type:,
     values:,
+    attribute_alias:,
     prefix: false,
     suffix: false
   )
+    enum_name = attribute_alias || attribute_name
     model = define_model(
       model_name,
       attribute_name => { type: column_type },
-    )
+    ) do
+      alias_attribute attribute_alias, attribute_name
+    end
 
     if active_record_enum_supports_prefix_and_suffix?
-      model.enum(attribute_name => values, _prefix: prefix, _suffix: suffix)
+      model.enum(enum_name => values, _prefix: prefix, _suffix: suffix)
     else
-      model.enum(attribute_name => values)
+      model.enum(enum_name => values)
     end
 
     model.new