Merge pull request #21720 from byroot/ignore-columns

Implement ActiveRecord::Base.ignored_columns

1 files changed, 8 insertions, 1 deletions

diff --git a/activerecord/lib/active_record/model_schema.rb b/activerecord/lib/active_record/model_schema.rb
index c461c04a26..a9bd094a66 100644
--- a/activerecord/lib/active_record/model_schema.rb
+++ b/activerecord/lib/active_record/model_schema.rb
@@ -50,6 +50,13 @@ module ActiveRecord
       class_attribute :pluralize_table_names, instance_writer: false
       self.pluralize_table_names = true
 
+      ##
+      # :singleton-method:
+      # Accessor for the list of columns names the model should ignore. Ignored columns won't have attribute
+      # accessors defined, and won't be referenced in SQL queries.
+      class_attribute :ignored_columns, instance_accessor: false
+      self.ignored_columns = [].freeze
+
       self.inheritance_column = 'type'
 
       delegate :type_for_attribute, to: :class
@@ -308,7 +315,7 @@ module ActiveRecord
       end
 
       def load_schema!
-        @columns_hash = connection.schema_cache.columns_hash(table_name)
+        @columns_hash = connection.schema_cache.columns_hash(table_name).except(*ignored_columns)
         @columns_hash.each do |name, column|
           warn_if_deprecated_type(column)
           define_attribute(