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  1. PO
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    <p>While I've never seen this ActiveScaffold exception before, I think this is what's going on:</p> <p>The reverse association is set up with the <code>:inverse_of</code> option, and <strong>its effects will be visible only</strong> while the records are unsaved. This is why you don't see it in your console experiment.</p> <p>Try this:</p> <pre><code>place = Place.new =&gt; #&lt;Place ...&gt; producer = place.producers.build =&gt; #&lt;Producer ...&gt; producer.place =&gt; nil place.producers.first.place =&gt; nil </code></pre> <p>These records will fail your validation, when built entirely in memory. If you never build a place and a producer at the same time, then you don't have to worry about this. If you do, however, then your validation rule also should be written to check for the existence of <code>:place</code> (i.e. the object), not <code>:place_id</code>:</p> <pre><code>validates_presence_of :place </code></pre> <p>I don't know which build/creation mechanism ActiveScaffold uses, but I would guess that if they throw this exception, that they may build things in memory.</p> <p>So, to fix this, try:</p> <pre><code>class Producer &lt; ActiveRecord::Base belongs_to :place, inverse_of: producers validates_presence_of :place end class Place &lt; ActiveRecord::Base has_many :producers, inverse_of: place end </code></pre> <p>Note: ActiveRecord used to not support <code>:inverse_of</code> on the <code>has_many</code> side and that limitation used to be commented in the source. As of Rails 3.1, this seems fixed. If you amend your classes with <code>:inverse_of</code> as shown, then the console experiment with in-memory objects should return the associated object.</p> <p>You may want to review the Rails API docs on <a href="http://api.rubyonrails.org/classes/ActiveRecord/Associations/ClassMethods.html#label-Bi-directional+associations" rel="nofollow">bi-directional associations</a></p>
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    1. USWolfram Arnold
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    1. COThanks for the answer, i was desperate (+1 for your time). What you say makes sense, but it won't work. I tried your fix and the same error pops up. Weird thing is that i never create a producer through a place ! Even weirder : other similar AS controllers do work with similar associations. Even more weird : it used to work... and i never saw it was broken until now (never had the time to write the tests, and now i wish i could jump back in time and punch my old self in the nuts in punishment for such frivolity)
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    2. CO@m_x Have you tried tracing the code in the debugger, and/or inspecting the ActiveScaffold code to see where it throws this exception? When I don't know any more, I tend to read through the sources and/or set breakpoints. An editor like RubyMine help a lot in that because you can easily browse and search gems and the debugger integration is also fantastic. Sorry I couldn't help.
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    3. CO...that's what i wanted to avoid... i already spent a ludicrous time debugging another problem in AS. I think that i will kick AS out from any other new project i do, i'm tired of its weird behaviour. As to RubyMine, i already considered purchasing an individual license a while ago, but i'm a bit short on money. Anyway, thanks for your time.
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