Received unexpected message :id= with (20)

Testing RSpec
1

Please help me to understand this error message:

  1. PostsController#create when logged in should create a new post and
    redirect to a successful message page
    Failure/Error: post ‘create’, { post: {title: ‘New post’,
    Mock Post(id: integer, title: string, description: text,
    location: string, created_at: datetime, updated_at: datetime, status:
    string, tags: string, views: integer, user_id: integer) received
    unexpected message :id= with (20)

    ./spec/controllers/posts_controller_spec.rb:56:in `block (4

levels) in <top (required)>’

Finished in 0.59991 seconds
6 examples, 1 failure

I’m trying to figure out this for about a week or more :frowning: