method

delete_all

rails latest stable - Class: ActiveRecord::Relation

delete_all()

public

Deletes the records without instantiating the records first, and hence not calling the {#destroy}[rdoc-ref:Persistence#destroy] method nor invoking callbacks. This is a single SQL DELETE statement that goes straight to the database, much more efficient than #destroy_all. Be careful with relations though, in particular :dependent rules defined on associations are not honored. Returns the number of rows affected.

Post.where(person_id: 5).where(category: ['Something', 'Else']).delete_all

Both calls delete the affected posts all at once with a single DELETE statement. If you need to destroy dependent associations or call your before_* or after_destroy callbacks, use the #destroy_all method instead.

If an invalid method is supplied, #delete_all raises an ActiveRecordError:

Post.distinct.delete_all
# => ActiveRecord::ActiveRecordError: delete_all doesn't support distinct

# File activerecord/lib/active_record/relation.rb, line 646
    def delete_all
      return 0 if @none

      invalid_methods = INVALID_METHODS_FOR_DELETE_ALL.select do |method|
        value = @values[method]
        method == :distinct ? value : value&.any?
      end
      if invalid_methods.any?
        raise ActiveRecordError.new("delete_all doesn't support #{invalid_methods.join(', ')}")
      end

      arel = eager_loading? ? apply_join_dependency.arel : build_arel
      arel.source.left = table

      group_values_arel_columns = arel_columns(group_values.uniq)
      having_clause_ast = having_clause.ast unless having_clause.empty?
      stmt = arel.compile_delete(table[primary_key], having_clause_ast, group_values_arel_columns)

      klass.connection.delete(stmt, "#{klass} Delete All").tap { reset }
    end

1Note

Works with scoped too

Vidmantas · Feb 23, 20111 thank

It's also available to use after scope chain too, like in any other AR action, for example:

User.where('age > 69').delete_all

delete_all

1Note

Works with scoped too

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