Re: [rspec-users] mocking a reference to a polymorphic model?
Are you really sure you need a polymorphic table?
On Thu, Mar 22, 2012 at 12:27, Fearless Fool li...@ruby-forum.com wrote:
The basic question: how do you mock a reference to a polymorphic class
in RSpec? Trying the obvious thing leads to an error of the form:
undefined method `base_class' for Post:Class
=== The details:
# file: app/models/relation.rb
class Relation ActiveRecord::Base
belongs_to :entity, :polymorphic = true
end
# file: db/xxx_create_relations.rb
class CreateRelations ActiveRecord::Migration
def change
create_table :relations do |t|
t.references :entity, :polymorphic = true, :null = false
end
end
end
# file: spec/models/relation_spec.rb
describe Relation do
it 'should create instance without error' do
post = mock_model(Post)
lambda { Relation.create!(:entity = @post)}.should_not raise_error
end
end
=== Running the test:
1) Relation should create instance without error
Failure/Error: lambda { Relation.create!(:entity = post)
}.should_not raise_error
expected no Exception, got #NoMethodError: undefined method
`base_class' for Post:Class
# ./spec/models/relation_spec.rb:39:in `block (2 levels) in top
(required)'
My hunch is that ActiveRecord is calling base_class on the mocked model
(Post) to determine what to stick in the 'entity_type' column in the
relations table. I tried explicitly setting it, as in:
post = mock_model(Post, :base_class = Post)
but the error was the same.
For all the reasons that DC espouses, I'd love to mock references to the
polymorphic models, but I don't see how to do that.
Any ideas?
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Re: [rspec-users] mocking a reference to a polymorphic model?
On 22 Mar 2012, at 17:27, Fearless Fool wrote:
The basic question: how do you mock a reference to a polymorphic class
in RSpec? Trying the obvious thing leads to an error of the form:
undefined method `base_class' for Post:Class
=== The details:
# file: app/models/relation.rb
class Relation ActiveRecord::Base
belongs_to :entity, :polymorphic = true
end
# file: db/xxx_create_relations.rb
class CreateRelations ActiveRecord::Migration
def change
create_table :relations do |t|
t.references :entity, :polymorphic = true, :null = false
end
end
end
# file: spec/models/relation_spec.rb
describe Relation do
it 'should create instance without error' do
post = mock_model(Post)
lambda { Relation.create!(:entity = @post)}.should_not raise_error
end
end
=== Running the test:
1) Relation should create instance without error
Failure/Error: lambda { Relation.create!(:entity = post)
}.should_not raise_error
expected no Exception, got #NoMethodError: undefined method
`base_class' for Post:Class
# ./spec/models/relation_spec.rb:39:in `block (2 levels) in top
(required)'
My hunch is that ActiveRecord is calling base_class on the mocked model
(Post) to determine what to stick in the 'entity_type' column in the
relations table. I tried explicitly setting it, as in:
post = mock_model(Post, :base_class = Post)
but the error was the same.
For all the reasons that DC espouses, I'd love to mock references to the
polymorphic models, but I don't see how to do that.
Can you enumerate those reasons? This doesn't seem like a good use-case for
mock_model, to me.
cheers,
Matt
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Author, http://pragprog.com/book/hwcuc/the-cucumber-book
Founder, http://www.relishapp.com/
Twitter, https://twitter.com/mattwynne
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