Undefined built-in django steps

[Крошкин В.И.]

I have model :Mymodel

I wrote feature: 

Feature: Win over lettuce

  Scenario: Search hidden steps
    Given Visit in the "db.com"
    Then Mymodel should be present in the database
      | name    | value |
      | Lettuce | Rocks |
I wrote step:
@step('Visit in the (.*)')
def visit_in_the(step, url):
    pass
I execute lettuce nameMyFeature.feature in console

 Then Mymodel should be present in the database  - it's Undefined
What is correct usage of  this?