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POConnecting two parallel join models in Rails
 

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    <p>Let's say that I have Projects, Users, and two ways to connect Users to Projects - Rsvps and Memberships. Like so:</p> <pre><code>class User &lt; ActiveRecord::Base has_many :memberships has_many :rsvps has_many :projects, :through =&gt; :memberships end class Project &lt; ActiveRecord::Base has_many :memberships has_many :rsvps has_many :members, :through =&gt; :memberships, :class_name =&gt; 'User' end class Rsvp &lt; ActiveRecord::Base belongs_to :project belongs_to :user end class Membership &lt; ActiveRecord::Base belongs_to :project belongs_to :user end </code></pre> <p>Rsvps and Memberships are different enough in their other functions that I don't especially want to combine them into one model, but I do want to be able to associate Rsvps and Memberships. My ideal-world scenario would be something like this:</p> <pre><code>class Membership &lt; ActiveRecord::Base has_one :rsvp, :through =&gt; [:project, :user] end </code></pre> <p>but obviously that's a pipe dream.</p> <p>The two potential solutions I've thought of so far are trying to fake an association with something like</p> <pre><code>def rsvp project.rsvps.find(:conditions =&gt; {:user_id =&gt; user_id}) end </code></pre> <p>but that's less than ideal as it doesn't duplicate all the fun other features that come with Association objects. Alternatively I could add a <code>membership_id</code> field to Rsvp, but that smells like it'll attract syncing-related bugs.</p> <p>Does anyone have any better ideas?</p>
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