Add enum prefix/suffix option to enum definition

Fixes #17511 and #17415

6 files changed, 104 insertions, 6 deletions

diff --git a/activerecord/CHANGELOG.md b/activerecord/CHANGELOG.md
index 6680ef4bd2..bf21851ed0 100644
--- a/activerecord/CHANGELOG.md
+++ b/activerecord/CHANGELOG.md
@@ -1,3 +1,9 @@
+*   Add `:enum_prefix`/`:enum_suffix` option to `enum` definition.
+
+    Fixes #17511 and #17415
+
+    *Igor Kapkov*
+
 *   Correctly handle decimal arrays with defaults in the schema dumper.
 
     Fixes #20515.
diff --git a/activerecord/lib/active_record/enum.rb b/activerecord/lib/active_record/enum.rb
index 2b99899e42..ad33c84dbc 100644
--- a/activerecord/lib/active_record/enum.rb
+++ b/activerecord/lib/active_record/enum.rb
@@ -75,6 +75,22 @@ module ActiveRecord
   #
   #   Conversation.where("status <> ?", Conversation.statuses[:archived])
   #
+  # You can use <tt>:enum_prefix</tt>/<tt>:enum_suffix</tt> option then you need
+  # to define multiple enums with same values. If option value is <tt>true</tt>,
+  # the methods are prefixed/suffixed with the name of the enum.
+  #
+  #   class Invoice < ActiveRecord::Base
+  #     enum verification: [:done, :fail], enum_prefix: true
+  #   end
+  #
+  # It is also possible to supply a custom prefix.
+  #
+  #   class Invoice < ActiveRecord::Base
+  #     enum verification: [:done, :fail], enum_prefix: :verification_status
+  #   end
+  #
+  # Note that <tt>:enum_prefix</tt>/<tt>:enum_postfix</tt> are reserved keywords
+  # and can not be used as an enum name.
 
   module Enum
     def self.extended(base) # :nodoc:
@@ -121,6 +137,8 @@ module ActiveRecord
 
     def enum(definitions)
       klass = self
+      enum_prefix = definitions.delete(:enum_prefix)
+      enum_suffix = definitions.delete(:enum_suffix)
       definitions.each do |name, values|
         # statuses = { }
         enum_values = ActiveSupport::HashWithIndifferentAccess.new
@@ -138,19 +156,31 @@ module ActiveRecord
         _enum_methods_module.module_eval do
           pairs = values.respond_to?(:each_pair) ? values.each_pair : values.each_with_index
           pairs.each do |value, i|
+            if enum_prefix == true
+              prefix = "#{name}_"
+            elsif enum_prefix
+              prefix = "#{enum_prefix}_"
+            end
+            if enum_suffix == true
+              suffix = "_#{name}"
+            elsif enum_suffix
+              suffix = "_#{enum_suffix}"
+            end
+
+            value_method_name = "#{prefix}#{value}#{suffix}"
             enum_values[value] = i
 
             # def active?() status == 0 end
-            klass.send(:detect_enum_conflict!, name, "#{value}?")
-            define_method("#{value}?") { self[name] == value.to_s }
+            klass.send(:detect_enum_conflict!, name, "#{value_method_name}?")
+            define_method("#{value_method_name}?") { self[name] == value.to_s }
 
             # def active!() update! status: :active end
-            klass.send(:detect_enum_conflict!, name, "#{value}!")
-            define_method("#{value}!") { update! name => value }
+            klass.send(:detect_enum_conflict!, name, "#{value_method_name}!")
+            define_method("#{value_method_name}!") { update! name => value }
 
             # scope :active, -> { where status: 0 }
-            klass.send(:detect_enum_conflict!, name, value, true)
-            klass.scope value, -> { klass.where name => value }
+            klass.send(:detect_enum_conflict!, name, value_method_name, true)
+            klass.scope value_method_name, -> { klass.where name => value }
           end
         end
         defined_enums[name.to_s] = enum_values
diff --git a/activerecord/test/cases/enum_test.rb b/activerecord/test/cases/enum_test.rb
index 3641826daa..769b171717 100644
--- a/activerecord/test/cases/enum_test.rb
+++ b/activerecord/test/cases/enum_test.rb
@@ -14,16 +14,26 @@ class EnumTest < ActiveRecord::TestCase
     assert_not @book.proposed?
 
     assert @book.read?
+    assert @book.in_english?
+    assert @book.author_visibility_visible?
+    assert @book.illustrator_visibility_visible?
+    assert @book.with_medium_font_size?
   end
 
   test "query state with strings" do
     assert_equal "published", @book.status
     assert_equal "read", @book.read_status
+    assert_equal "english", @book.language
+    assert_equal "visible", @book.author_visibility
+    assert_equal "visible", @book.illustrator_visibility
   end
 
   test "find via scope" do
     assert_equal @book, Book.published.first
     assert_equal @book, Book.read.first
+    assert_equal @book, Book.in_english.first
+    assert_equal @book, Book.author_visibility_visible.first
+    assert_equal @book, Book.illustrator_visibility_visible.first
   end
 
   test "find via where with values" do
@@ -72,6 +82,10 @@ class EnumTest < ActiveRecord::TestCase
   test "update by declaration" do
     @book.written!
     assert @book.written?
+    @book.in_english!
+    assert @book.in_english?
+    @book.author_visibility_visible!
+    assert @book.author_visibility_visible?
   end
 
   test "update by setter" do
@@ -96,42 +110,61 @@ class EnumTest < ActiveRecord::TestCase
 
   test "enum changed attributes" do
     old_status = @book.status
+    old_language = @book.language
     @book.status = :proposed
+    @book.language = :spanish
     assert_equal old_status, @book.changed_attributes[:status]
+    assert_equal old_language, @book.changed_attributes[:language]
   end
 
   test "enum changes" do
     old_status = @book.status
+    old_language = @book.language
     @book.status = :proposed
+    @book.language = :spanish
     assert_equal [old_status, 'proposed'], @book.changes[:status]
+    assert_equal [old_language, 'spanish'], @book.changes[:language]
   end
 
   test "enum attribute was" do
     old_status = @book.status
+    old_language = @book.language
     @book.status = :published
+    @book.language = :spanish
     assert_equal old_status, @book.attribute_was(:status)
+    assert_equal old_language, @book.attribute_was(:language)
   end
 
   test "enum attribute changed" do
     @book.status = :proposed
+    @book.language = :french
     assert @book.attribute_changed?(:status)
+    assert @book.attribute_changed?(:language)
   end
 
   test "enum attribute changed to" do
     @book.status = :proposed
+    @book.language = :french
     assert @book.attribute_changed?(:status, to: 'proposed')
+    assert @book.attribute_changed?(:language, to: 'french')
   end
 
   test "enum attribute changed from" do
     old_status = @book.status
+    old_language = @book.language
     @book.status = :proposed
+    @book.language = :french
     assert @book.attribute_changed?(:status, from: old_status)
+    assert @book.attribute_changed?(:language, from: old_language)
   end
 
   test "enum attribute changed from old status to new status" do
     old_status = @book.status
+    old_language = @book.language
     @book.status = :proposed
+    @book.language = :french
     assert @book.attribute_changed?(:status, from: old_status, to: 'proposed')
+    assert @book.attribute_changed?(:language, from: old_language, to: 'french')
   end
 
   test "enum didn't change" do
@@ -201,11 +234,15 @@ class EnumTest < ActiveRecord::TestCase
   test "building new objects with enum scopes" do
     assert Book.written.build.written?
     assert Book.read.build.read?
+    assert Book.in_spanish.build.in_spanish?
+    assert Book.illustrator_visibility_invisible.build.illustrator_visibility_invisible?
   end
 
   test "creating new objects with enum scopes" do
     assert Book.written.create.written?
     assert Book.read.create.read?
+    assert Book.in_spanish.create.in_spanish?
+    assert Book.illustrator_visibility_invisible.create.illustrator_visibility_invisible?
   end
 
   test "_before_type_cast returns the enum label (required for form fields)" do
@@ -355,4 +392,17 @@ class EnumTest < ActiveRecord::TestCase
     book2 = klass.single.create!
     assert book2.single?
   end
+
+  test "query state by predicate with prefix" do
+    assert @book.author_visibility_visible?
+    assert_not @book.author_visibility_invisible?
+    assert @book.illustrator_visibility_visible?
+    assert_not @book.illustrator_visibility_invisible?
+  end
+
+  test "query state by predicate with custom prefix" do
+    assert @book.in_english?
+    assert_not @book.in_spanish?
+    assert_not @book.in_french?
+  end
 end
diff --git a/activerecord/test/fixtures/books.yml b/activerecord/test/fixtures/books.yml
index 380dd3dfca..93cfabd61c 100644
--- a/activerecord/test/fixtures/books.yml
+++ b/activerecord/test/fixtures/books.yml
@@ -5,6 +5,10 @@ awdr:
   format: "paperback"
   status: :published
   read_status: :read
+  language: :english
+  author_visibility: :visible
+  illustrator_visibility: :visible
+  font_size: :medium
 
 rfr:
   author_id: 1
diff --git a/activerecord/test/models/book.rb b/activerecord/test/models/book.rb
index 2170018068..24bfe47bbf 100644
--- a/activerecord/test/models/book.rb
+++ b/activerecord/test/models/book.rb
@@ -10,6 +10,10 @@ class Book < ActiveRecord::Base
   enum status: [:proposed, :written, :published]
   enum read_status: {unread: 0, reading: 2, read: 3}
   enum nullable_status: [:single, :married]
+  enum language: [:english, :spanish, :french], enum_prefix: :in
+  enum author_visibility: [:visible, :invisible], enum_prefix: true
+  enum illustrator_visibility: [:visible, :invisible], enum_prefix: true
+  enum font_size: [:small, :medium, :large], enum_prefix: :with, enum_suffix: true
 
   def published!
     super
diff --git a/activerecord/test/schema/schema.rb b/activerecord/test/schema/schema.rb
index 8b010f265c..dffccc9326 100644
--- a/activerecord/test/schema/schema.rb
+++ b/activerecord/test/schema/schema.rb
@@ -100,6 +100,10 @@ ActiveRecord::Schema.define do
     t.column :status, :integer, default: 0
     t.column :read_status, :integer, default: 0
     t.column :nullable_status, :integer
+    t.column :language, :integer, default: 0
+    t.column :author_visibility, :integer, default: 0
+    t.column :illustrator_visibility, :integer, default: 0
+    t.column :font_size, :integer, default: 0
   end
 
   create_table :booleans, force: true do |t|