associated_with?

# File activerecord/lib/active_record/table_metadata.rb, line 25
    def associated_with?(table_name)
      if reflection = klass&._reflect_on_association(table_name)
        reflection
      elsif ActiveRecord.allow_deprecated_singular_associations_name && reflection = klass&._reflect_on_association(table_name.singularize)
        ActiveRecord.deprecator.warn(<<~MSG)
          Referring to a singular association (e.g. `#{reflection.name}`) by its plural name (e.g. `#{reflection.plural_name}`) is deprecated.

          To convert this deprecation warning to an error and enable more performant behavior, set config.active_record.allow_deprecated_singular_associations_name = false.
        MSG
        reflection
      end
    end