i-arindam

class User < ApplicationRecord
  has_many :posts
  has_many :comments
  #  id                   :integer          not null, primary key
  #  name                 :string(50)       default("")
end

i-arindam

#Model 

@user.should have(1).error_on(:username) # Checks whether there is an error in username 
@user.errors[:username].should include("can't be blank")  # check for the error message 

#Rendering
response.should render_template(:index)

#Redirecting 
response.should redirect_to(movies_path)

i-arindam

1. to_param

  [ 1, 'String', true, String].to_param

"1/String/true/String"

2. with_options

  class ModelName < AR::Base
    has_many :model1, dependent: :destroy