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POCreating a gem with associated Rails models
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  1. POCreating a gem with associated Rails models
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    copied!<p>I would like to package a gem that includes ActiveRecord models that can be associated with models in the existing Rails application. I've been trying to follow the code for acts_as_taggable_on, but I'm running into some problems getting the associations to work.</p> <p>My gem is called Kitchen. My model defined in the gem is Dish, and I want to add a polymorphic association (as Cook) to a model in the main application such as User.</p> <p>In <code>lib/kitchen.rb</code></p> <pre><code>require "active_record" require "kitchen/dish.rb" require "kitchen/cook.rb" </code></pre> <p>In <code>lib/kitchen/dish.rb</code></p> <pre><code>module Kitchen class Dish &lt; ::ActiveRecord::Base belongs_to :cook, :polymorphic =&gt; true end end </code></pre> <p>In <code>lib/kitchen/cook.rb</code> (lifting code from <a href="http://guides.rubyonrails.org/plugins.html#add-an-acts_as-method-to-active-record" rel="nofollow">http://guides.rubyonrails.org/plugins.html#add-an-acts_as-method-to-active-record</a> without much understanding)</p> <pre><code>module Kitchen module Cook extend ActiveSupport::Concern included do end module ClassMethods def acts_as_cook class_eval do has_many :dishes, :as =&gt; :cook end end end end end ActiveRecord::Base.send :include, Kitchen::Cook </code></pre> <p>Finally, I've migrated everything in my dummy app, and include the association in <code>spec/dummy/app/models/user.rb</code></p> <pre><code>class User &lt; ActiveRecord::Base acts_as_cook end </code></pre> <p>I'm getting an error any time I try to access <code>user.dishes</code> for a User instance:</p> <pre><code> NameError: uninitialized constant User::Dish </code></pre> <p>Any idea what's missing? </p>
 

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