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Fixtures, mock objects or in-memory ActiveRecord objects?

Wilson Bilkovich has posted an article about mocking ActiveRecord objects.

A new method mock_model is defined that builds a mock object which will respond the same way as a real ActiveRecord object. As I understand it, this means he can replace…

@campaign = mock("campaign")
@campaign.stub!(:is_a?).and_return(true)
@campaign.stub!(:new_record?).and_return(false)
@campaign.stub!(:id).and_return(rand(1000))

with…

mock_model :campaign

Although I agree with him that using fixtures is not a good idea, why not use a real ActiveRecord object…

@campaign = Campaign.new

Sometimes due to the way ActiveRecord couples your models to the database, it becomes essential to have a model in the database and not just in memory. In which case why not just do this…

@campaign = Campaign.create!

I’ve written up a couple more thoughts here and here.

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