diff --git a/activerecord/lib/active_record/associations/through_association.rb b/activerecord/lib/active_record/associations/through_association.rb
index 07e7bf1a89f925ac41d56d505ce1f563245a9045..6b87993ba3fedd4bd529efc01112b890a16606bf 100644
--- a/activerecord/lib/active_record/associations/through_association.rb
+++ b/activerecord/lib/active_record/associations/through_association.rb
@@ -10,7 +10,7 @@ module ThroughAssociation #:nodoc:
         #
         #   1. To get the default_scope conditions for any of the other reflections in the chain
         #   2. To get the type conditions for any STI models in the chain
-        def target_scope # :doc:
+        def target_scope
           scope = super
           reflection.chain.drop(1).each do |reflection|
             relation = reflection.klass.all
diff --git a/activerecord/lib/active_record/attribute.rb b/activerecord/lib/active_record/attribute.rb
index 2a8e8f9de4c4a399ad58639b0f49ac98860e022f..38281158d87e46ba5a859e7ff72e87f30bc2e1aa 100644
--- a/activerecord/lib/active_record/attribute.rb
+++ b/activerecord/lib/active_record/attribute.rb
@@ -135,7 +135,7 @@ def encode_with(coder)
       attr_reader :original_attribute
       alias_method :assigned?, :original_attribute
 
-      def original_value_for_database # :doc:
+      def original_value_for_database
         if assigned?
           original_attribute.original_value_for_database
         else
@@ -144,17 +144,17 @@ def original_value_for_database # :doc:
       end
 
     private
-      def initialize_dup(other) # :doc:
+      def initialize_dup(other)
         if defined?(@value) && @value.duplicable?
           @value = @value.dup
         end
       end
 
-      def changed_from_assignment? # :doc:
+      def changed_from_assignment?
         assigned? && type.changed?(original_value, value, value_before_type_cast)
       end
 
-      def _original_value_for_database # :doc:
+      def _original_value_for_database
         type.serialize(original_value)
       end
 
diff --git a/activerecord/lib/active_record/validations/uniqueness.rb b/activerecord/lib/active_record/validations/uniqueness.rb
index 453d7079aca6b48567b8e62c7a0c6ff24289489e..9e8edfbfaf201a0a4369e25ec5a0a69d07c4cd1a 100644
--- a/activerecord/lib/active_record/validations/uniqueness.rb
+++ b/activerecord/lib/active_record/validations/uniqueness.rb
@@ -83,7 +83,7 @@ def build_relation(klass, attribute, value)
         end
       end
 
-      def scope_relation(record, relation) # :doc:
+      def scope_relation(record, relation)
         Array(options[:scope]).each do |scope_item|
           scope_value = if record.class._reflect_on_association(scope_item)
             record.association(scope_item).reader
@@ -96,7 +96,7 @@ def scope_relation(record, relation) # :doc:
         relation
       end
 
-      def map_enum_attribute(klass, attribute, value) # :doc:
+      def map_enum_attribute(klass, attribute, value)
         mapping = klass.defined_enums[attribute.to_s]
         value = mapping[value] if value && mapping
         value
diff --git a/activerecord/lib/rails/generators/active_record/migration/migration_generator.rb b/activerecord/lib/rails/generators/active_record/migration/migration_generator.rb
index 1de2aff63250d68092f4291e52526c01f04cf60d..8511531af77db7c68d74b021cf963b9eb7231e5c 100644
--- a/activerecord/lib/rails/generators/active_record/migration/migration_generator.rb
+++ b/activerecord/lib/rails/generators/active_record/migration/migration_generator.rb
@@ -23,7 +23,7 @@ def create_migration_file
         # Sets the default migration template that is being used for the generation of the migration.
         # Depending on command line arguments, the migration template and the table name instance
         # variables are set up.
-        def set_local_assigns! # :doc:
+        def set_local_assigns!
           @migration_template = "migration.rb"
           case file_name
           when /^(add|remove)_.*_(?:to|from)_(.*)/
@@ -42,13 +42,13 @@ def set_local_assigns! # :doc:
           end
         end
 
-        def set_index_names # :doc:
+        def set_index_names
           attributes.each_with_index do |attr, i|
             attr.index_name = [attr, attributes[i - 1]].map { |a| index_name_for(a) }
           end
         end
 
-        def index_name_for(attribute) # :doc:
+        def index_name_for(attribute)
           if attribute.foreign_key?
             attribute.name
           else
diff --git a/activerecord/lib/rails/generators/active_record/model/model_generator.rb b/activerecord/lib/rails/generators/active_record/model/model_generator.rb
index ff768818348e301838e03a6415ed504bde00d820..61a8d3c1000447968b84ddd9e4a219de2640fb74 100644
--- a/activerecord/lib/rails/generators/active_record/model/model_generator.rb
+++ b/activerecord/lib/rails/generators/active_record/model/model_generator.rb
@@ -35,29 +35,29 @@ def create_module_file
 
       private
 
-        def attributes_with_index # :doc:
+        def attributes_with_index
           attributes.select { |a| !a.reference? && a.has_index? }
         end
 
         # FIXME: Change this file to a symlink once RubyGems 2.5.0 is required.
-        def generate_application_record # :doc:
+        def generate_application_record
           if self.behavior == :invoke && !application_record_exist?
             template "application_record.rb", application_record_file_name
           end
         end
 
         # Used by the migration template to determine the parent name of the model
-        def parent_class_name # :doc:
+        def parent_class_name
           options[:parent] || "ApplicationRecord"
         end
 
-        def application_record_exist? # :doc:
+        def application_record_exist?
           file_exist = nil
           in_root { file_exist = File.exist?(application_record_file_name) }
           file_exist
         end
 
-        def application_record_file_name # :doc:
+        def application_record_file_name
           @application_record_file_name ||= if mountable_engine?
             "app/models/#{namespaced_path}/application_record.rb"
           else