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POInheriting Rails i18n validation error messages in the subclass
 

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    <h2>What I understand</h2> <p>Suppose I have a class with a handy validation like:</p> <pre><code>User &lt; ActiveRecord::Base validates :username, :format =&gt; {/regex/}, :message =&gt; :name_format end </code></pre> <p>In this case, I can use <code>i18n</code> to make the error message translatable, by including the following in my <code>/config/locals/en.yml</code>:</p> <pre><code>en: activerecord: errors: models: user: attributes: username: name_format: 'has the way-wrong format, bro!' </code></pre> <p>This is fine and generally really handy.</p> <h2>What I want to know:</h2> <p>My question is: What happens when I have subclasses that inherit from User:</p> <pre><code>UserSubclassOne &lt; User # extra stuff end UserSubclassTwo &lt; User # extra stuff end ... UserSubclassEnn &lt; User # extra stuff end </code></pre> <p>Now the problem is that Rails can't find the translation <code>user_subclass_one.attributes.username.name_format</code>.</p> <p>It complains: </p> <pre><code>translation missing: en.activerecord.errors.models.user_subclass_one.attributes.username.name_format </code></pre> <p>I'd hope that Rails would look up the hierarchy of <code>UserSubclassOne</code> to <code>User</code> when searching for a string in <code>en.yml</code> and then notice when it gets a 'hit', but (unless I've done something horribly wrong) apparently that doesn't happen. </p> <p>An obvious solution is to duplicate the data in <code>en.yml.en.errors.models</code> for <code>user</code>, <code>user_subclass_one</code>, <code>user_subclass_two</code>, etc, but my Rails-sense tells me that this is deeply wrong.</p> <p>Any ideas, folks?</p> <h2>Potential Complication:</h2> <p><code>User</code> is defined in a gem <code>MyGem</code> that is included in a Rails engine <code>MyEngine</code> that is included in the full-on Rails app <code>MyApp</code> that defines <code>UserSubclassOne</code>, ..., <code>UserSubclassEnn</code>. I don't think this should matter though, since the validations are running in <code>MyGem::User</code>, which is where the <code>en.yml</code> file lives -- just wanted to let people know in case it does.</p> <h1>Ultimate problem/solution:</h1> <p>So it turns out that the problem was namespacing. Recall that <code>MyApp</code> (which defines <code>UserSubclassOne</code>) uses <code>MyGem</code> (which defines <code>User</code>). It turns out <code>User</code> is actually in the namespace <code>MyGem</code> (this is not necessarily always the case), so the full declaration line at the beginning of <code>User</code> is not:</p> <pre><code>User &lt; ActiveRecord::Base </code></pre> <p>but rather</p> <pre><code>MyGem::User &lt; ActiveRecord::Base </code></pre> <p>.</p> <p>When the i18n gem looks up the class hierarchy, it notices this namespace and searches for <code>my_gem/user</code>, rather than simply <code>user</code>, <code>my_gem.user</code>, <code>my_gem: user</code>, etc.</p> <p>Thus I had to change my <code>en.yml</code> file to: <code>/config/locals/en.yml</code>:</p> <pre><code>en: activerecord: errors: models: my_gem/user: attributes: username: name_format: 'has the way-wrong format, bro!' </code></pre> <p>and bingo!</p>
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