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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