diff --git a/activerecord/lib/active_record/associations/builder/association.rb b/activerecord/lib/active_record/associations/builder/association.rb
index 3534e037b7..d4f59100e8 100644
--- a/activerecord/lib/active_record/associations/builder/association.rb
+++ b/activerecord/lib/active_record/associations/builder/association.rb
@@ -40,14 +40,14 @@ def define_accessors
 
       def define_readers
         name = self.name
-        mixin.send(:define_method, name) do |*params|
+        mixin.redefine_method(name) do |*params|
           association(name).reader(*params)
         end
       end
 
       def define_writers
         name = self.name
-        mixin.send(:define_method, "#{name}=") do |value|
+        mixin.redefine_method("#{name}=") do |value|
           association(name).writer(value)
         end
       end
diff --git a/activerecord/lib/active_record/associations/builder/belongs_to.rb b/activerecord/lib/active_record/associations/builder/belongs_to.rb
index 0ca107035f..1759a41d93 100644
--- a/activerecord/lib/active_record/associations/builder/belongs_to.rb
+++ b/activerecord/lib/active_record/associations/builder/belongs_to.rb
@@ -25,14 +25,14 @@ def add_counter_cache_callbacks(reflection)
         name         = self.name
 
         method_name = "belongs_to_counter_cache_after_create_for_#{name}"
-        mixin.send(:define_method, method_name) do
+        mixin.redefine_method(method_name) do
           record = send(name)
           record.class.increment_counter(cache_column, record.id) unless record.nil?
         end
         model.after_create(method_name)
 
         method_name = "belongs_to_counter_cache_before_destroy_for_#{name}"
-        mixin.send(:define_method, method_name) do
+        mixin.redefine_method(method_name) do
           record = send(name)
           record.class.decrement_counter(cache_column, record.id) unless record.nil?
         end
@@ -48,7 +48,7 @@ def add_touch_callbacks(reflection)
         method_name = "belongs_to_touch_after_save_or_destroy_for_#{name}"
         touch       = options[:touch]
 
-        mixin.send(:define_method, method_name) do
+        mixin.redefine_method(method_name) do
           record = send(name)
 
           unless record.nil?
diff --git a/activerecord/lib/active_record/associations/builder/collection_association.rb b/activerecord/lib/active_record/associations/builder/collection_association.rb
index 1805ea2c1e..35f9a3ae8e 100644
--- a/activerecord/lib/active_record/associations/builder/collection_association.rb
+++ b/activerecord/lib/active_record/associations/builder/collection_association.rb
@@ -58,7 +58,7 @@ def define_readers
         super
 
         name = self.name
-        mixin.send(:define_method, "#{name.to_s.singularize}_ids") do
+        mixin.redefine_method("#{name.to_s.singularize}_ids") do
           association(name).ids_reader
         end
       end
@@ -67,7 +67,7 @@ def define_writers
         super
 
         name = self.name
-        mixin.send(:define_method, "#{name.to_s.singularize}_ids=") do |ids|
+        mixin.redefine_method("#{name.to_s.singularize}_ids=") do |ids|
           association(name).ids_writer(ids)
         end
       end
diff --git a/activerecord/lib/active_record/associations/builder/has_many.rb b/activerecord/lib/active_record/associations/builder/has_many.rb
index 8a6f5a87e7..d29a525b9e 100644
--- a/activerecord/lib/active_record/associations/builder/has_many.rb
+++ b/activerecord/lib/active_record/associations/builder/has_many.rb
@@ -28,7 +28,7 @@ def configure_dependency
 
       def define_destroy_dependency_method
         name = self.name
-        mixin.send(:define_method, dependency_method_name) do
+        mixin.redefine_method(dependency_method_name) do
           send(name).each do |o|
             # No point in executing the counter update since we're going to destroy the parent anyway
             counter_method = ('belongs_to_counter_cache_before_destroy_for_' + self.class.name.downcase).to_sym
@@ -45,7 +45,7 @@ class << o
 
       def define_delete_all_dependency_method
         name = self.name
-        mixin.send(:define_method, dependency_method_name) do
+        mixin.redefine_method(dependency_method_name) do
           send(name).delete_all
         end
       end
@@ -53,7 +53,7 @@ def define_delete_all_dependency_method
 
       def define_restrict_dependency_method
         name = self.name
-        mixin.send(:define_method, dependency_method_name) do
+        mixin.redefine_method(dependency_method_name) do
           raise ActiveRecord::DeleteRestrictionError.new(name) unless send(name).empty?
         end
       end
diff --git a/activerecord/lib/active_record/associations/builder/has_one.rb b/activerecord/lib/active_record/associations/builder/has_one.rb
index 2cea8b9805..7a6cd3890f 100644
--- a/activerecord/lib/active_record/associations/builder/has_one.rb
+++ b/activerecord/lib/active_record/associations/builder/has_one.rb
@@ -45,7 +45,7 @@ def dependency_method_name
 
       def define_destroy_dependency_method
         name = self.name
-        mixin.send(:define_method, dependency_method_name) do
+        mixin.redefine_method(dependency_method_name) do
           association(name).delete
         end
       end
@@ -54,7 +54,7 @@ def define_destroy_dependency_method
 
       def define_restrict_dependency_method
         name = self.name
-        mixin.send(:define_method, dependency_method_name) do
+        mixin.redefine_method(dependency_method_name) do
           raise ActiveRecord::DeleteRestrictionError.new(name) unless send(name).nil?
         end
       end
diff --git a/activerecord/lib/active_record/associations/builder/singular_association.rb b/activerecord/lib/active_record/associations/builder/singular_association.rb
index 020e9157b3..436b6c1524 100644
--- a/activerecord/lib/active_record/associations/builder/singular_association.rb
+++ b/activerecord/lib/active_record/associations/builder/singular_association.rb
@@ -16,15 +16,15 @@ def define_accessors
       def define_constructors
         name = self.name
 
-        mixin.send(:define_method, "build_#{name}") do |*params, &block|
+        mixin.redefine_method("build_#{name}") do |*params, &block|
           association(name).build(*params, &block)
         end
 
-        mixin.send(:define_method, "create_#{name}") do |*params, &block|
+        mixin.redefine_method("create_#{name}") do |*params, &block|
           association(name).create(*params, &block)
         end
 
-        mixin.send(:define_method, "create_#{name}!") do |*params, &block|
+        mixin.redefine_method("create_#{name}!") do |*params, &block|
           association(name).create!(*params, &block)
         end
       end