Fix for alias_attribute.

lib/aasm/persistence/active_record_persistence.rb

@@ -117,9 +117,15 @@ def aasm_enum(name=:default)
 
         def aasm_column_looks_like_enum(name=:default)
           column_name = self.class.aasm(name).attribute_name.to_s
-          column = self.class.columns_hash[column_name]
-          raise NoMethodError.new("undefined method '#{column_name}' for #{self.class}") if column.nil?
-          column.type == :integer
+
+          # required for rails -v < 6
+          column_name = self.class.attribute_alias(column_name) if self.class.attribute_alias?(column_name)
+
+          attr_type = self.type_for_attribute(column_name)
+
+          raise NoMethodError.new("undefined method '#{column_name}' for #{self.class}") if attr_type.nil? || attr_type.type.nil?
+
+          attr_type.type == :integer
         end
 
         def aasm_guess_enum_method(name=:default)

spec/database.rb

@@ -1,5 +1,5 @@
 ActiveRecord::Migration.suppress_messages do
-  %w{gates multiple_gates readers writers transients simples no_scopes multiple_no_scopes no_direct_assignments multiple_no_direct_assignments thieves multiple_thieves localizer_test_models persisted_states provided_and_persisted_states with_enums with_enum_without_columns multiple_with_enum_without_columns with_true_enums with_false_enums false_states multiple_with_enums multiple_with_true_enums multiple_with_false_enums multiple_false_states readme_jobs}.each do |table_name|
+  %w{gates multiple_gates readers writers transients simples no_scopes multiple_no_scopes no_direct_assignments multiple_no_direct_assignments thieves multiple_thieves localizer_test_models persisted_states provided_and_persisted_states with_enums with_enum_without_columns multiple_with_enum_without_columns with_true_enums with_false_enums false_states multiple_with_enums multiple_with_true_enums multiple_with_false_enums multiple_false_states readme_jobs with_aliases}.each do |table_name|
     ActiveRecord::Migration.create_table table_name, :force => true do |t|
       t.string "aasm_state"
     end

spec/models/active_record/with_alias.rb

@@ -0,0 +1,20 @@
+# frozen_string_literal: true
+
+class WithAlias < ActiveRecord::Base
+  include AASM
+
+  alias_attribute :aasm_state_alias, :aasm_state
+
+  aasm :aasm_state_alias do
+    state :active, initial: true
+    state :inactive
+
+    event :activate do
+      transitions from: :inactive, to: :active
+    end
+
+    event :deactivate do
+      transitions from: :active, to: :inactive
+    end
+  end
+end

spec/unit/persistence/active_record_persistence_multiple_spec.rb

@@ -25,23 +25,22 @@
       subject { lambda{ gate.send(:aasm_column_looks_like_enum, :left) } }
 
       let(:column_name) { "value" }
-      let(:columns_hash) { Hash[column_name, column] }
 
       before :each do
         allow(gate.class.aasm(:left)).to receive(:attribute_name).and_return(column_name.to_sym)
-        allow(gate.class).to receive(:columns_hash).and_return(columns_hash)
+        allow(gate.class).to receive(:type_for_attribute).with(column_name).and_return(OpenStruct.new(type: type))
       end
 
       context "when AASM column has integer type" do
-        let(:column) { double(Object, type: :integer) }
+        let(:type) { :integer }
 
         it "returns true" do
           expect(subject.call).to be_truthy
         end
       end
 
       context "when AASM column has string type" do
-        let(:column) { double(Object, type: :string) }
+        let(:type) { :string }
 
         it "returns false" do
           expect(subject.call).to be_falsey
@@ -120,7 +119,7 @@
         # Enum are introduced from Rails 4.1, therefore enum syntax will not work on Rails <= 4.1
         context "when AASM enum setting is not enabled and aasm column not present" do
 
-          let(:multiple_with_enum_without_column) {MultipleWithEnumWithoutColumn.new}
+          let(:multiple_with_enum_without_column) { MultipleWithEnumWithoutColumn.new }
 
           it "should raise NoMethodError for transitions" do
             expect{multiple_with_enum_without_column.send(:view, :left)}.to raise_error(NoMethodError, /undefined method .status./)

spec/unit/persistence/active_record_persistence_spec.rb

@@ -25,15 +25,14 @@
       subject { lambda{ gate.send(:aasm_column_looks_like_enum) } }
 
       let(:column_name) { "value" }
-      let(:columns_hash) { Hash[column_name, column] }
 
       before :each do
         allow(gate.class.aasm).to receive(:attribute_name).and_return(column_name.to_sym)
-        allow(gate.class).to receive(:columns_hash).and_return(columns_hash)
+        allow(gate.class).to receive(:type_for_attribute).with(column_name).and_return(OpenStruct.new(type: column))
       end
 
       context "when AASM column has integer type" do
-        let(:column) { double(Object, type: :integer) }
+        let(:column) { :integer }
 
         it "returns true" do
           expect(subject.call).to be_truthy

spec/unit/with_alias_spec.rb

@@ -0,0 +1,21 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+if defined?(ActiveRecord)
+  require 'models/active_record/with_alias'
+
+  load_schema
+
+  describe 'With Allias' do
+    it 'should not break aasm methods' do
+      with_allias = WithAlias.new
+      expect(with_allias.aasm(:aasm_state_alias).current_state).to eq(:active)
+
+      with_allias.deactivate!
+
+      expect(with_allias.aasm_state).to eq('inactive')
+      expect(with_allias.aasm(:aasm_state_alias).current_state).to eq(:inactive)
+    end
+  end
+end