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PORuby on Rails: how to get error messages from a child resource displayed?
 

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  1. PORuby on Rails: how to get error messages from a child resource displayed?
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    <p>I'm having a difficult time understanding how to get Rails to show an explicit error message for a child resource that is failing validation when I render an XML template. Hypothetically, I have the following classes:</p> <pre><code>class School &lt; ActiveRecord::Base has_many :students validates_associated :students def self.add_student(bad_email) s = Student.new(bad_email) students &lt;&lt; s end end class Student &lt; ActiveRecord::Base belongs_to :school validates_format_of :email, :with =&gt; /^([^@\s]+)@((?:[-a-z0-9]+\.)+[a-z]{2,})$/i, :message =&gt; "You must supply a valid email" end </code></pre> <p>Now, in the controller, let's say we want to build a trivial API to allow us to add a new School with a student in it (again, I said, it's a terrible example, but plays its role for the purpose of the question)</p> <pre><code>class SchoolsController &lt; ApplicationController def create @school = School.new @school.add_student(params[:bad_email]) respond_to do |format| if @school.save # some code else format.xml { render :xml =&gt; @school.errors, :status =&gt; :unprocessable_entity } end end end end </code></pre> <p>Now the validation is working just fine, things die because the email doesn't match the regex that's set in the validates_format_of method in the Student class. However the output I get is the following:</p> <pre><code>&lt;?xml version="1.0" encoding="UTF-8"?&gt; &lt;errors&gt; &lt;error&gt;Students is invalid&lt;/error&gt; &lt;/errors&gt; </code></pre> <p>I want the more meaningful error message that I set above with validates_format_of to show up. Meaning, I want it to say:</p> <pre><code> &lt;error&gt;You must supply a valid email&lt;/error&gt; </code></pre> <p>What am I doing wrong for that not to show up? </p>
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