Method: ActiveRecord::ConnectionAdapters::SchemaStatements#rename_index

Defined in:
activerecord/lib/active_record/connection_adapters/abstract/schema_statements.rb

#rename_index(table_name, old_name, new_name) ⇒ Object

Renames an index.

Rename the index_people_on_last_name index to index_users_on_last_name:

rename_index :people, 'index_people_on_last_name', 'index_users_on_last_name'



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# File 'activerecord/lib/active_record/connection_adapters/abstract/schema_statements.rb', line 980

def rename_index(table_name, old_name, new_name)
  old_name = old_name.to_s
  new_name = new_name.to_s
  validate_index_length!(table_name, new_name)

  # this is a naive implementation; some DBs may support this more efficiently (PostgreSQL, for instance)
  old_index_def = indexes(table_name).detect { |i| i.name == old_name }
  return unless old_index_def
  add_index(table_name, old_index_def.columns, name: new_name, unique: old_index_def.unique)
  remove_index(table_name, name: old_name)
end