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 -- Freelance programmer & coach Author, http://pragprog.com/book/hwcuc/the-cucumber-book Founder, http://www.relishapp.com/ Twitter, https://twitter.com/mattwynne
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