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PO"Contact has_many :addresses" does work when checking presence of :contact, within Address, but not with :contact_id (and without validation)
 

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  1. PO"Contact has_many :addresses" does work when checking presence of :contact, within Address, but not with :contact_id (and without validation)
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    <p>I really had a hard time tracking this problem down, and now I know what's going wrong, but don't know why, and whether it's a bug or not.</p> <pre><code>macbuech:iq josh$ ruby -v ruby 1.9.3p0 (2011-10-30 revision 33570) [x86_64-darwin11.4.0] macbuech:iq josh$ rails -v Rails 3.2.1 </code></pre> <p>I have a model <code>Contact</code> which <code>has_many :addresses</code>. Everything worked perfectly so far, until I decided to validate presence of <code>Address.contact_id</code>, which seems to break the <code>my_contact.addresses &lt;&lt; my_address</code> functionality! First of all how it used to work:</p> <pre><code>class Address &lt; ActiveRecord::Base belongs_to :contact validates :contact, :presence =&gt; true # ... end class Contact &lt; ActiveRecord::Base has_many :addresses # ... end </code></pre> <p>Here's the output of a test in the Rails console:</p> <pre><code>1.9.3p0 :001 &gt; c = FactoryGirl.create :contact =&gt; #&lt;Contact id: 71, corporate: false, companyname: nil, firstname: nil, middlename: nil, lastname: "Doe", initials: nil, nickname: nil, gender: "male", title: nil, profession: nil, department: nil, birthday: nil, spouse: nil, kids: nil, superior: nil, assistant: nil, contacttype_id: 71, language_id: nil&gt; 1.9.3p0 :002 &gt; a = FactoryGirl.create :address =&gt; #&lt;Address id: 63, active: true, standard: false, street: "Mustergasse 123", extraline1: nil, extraline2: nil, city: "Musterhausen", zip: 8088, province: nil, pobox: nil, latitude: nil, longitude: nil, validfrom: nil, validto: nil, label: nil, description: nil, contact_id: 72, addresstype_id: 63, country_id: 63&gt; 1.9.3p0 :003 &gt; c.addresses =&gt; [] 1.9.3p0 :004 &gt; c.addresses &lt;&lt; a =&gt; [#&lt;Address id: 63, active: true, standard: false, street: "Mustergasse 123", extraline1: nil, extraline2: nil, city: "Musterhausen", zip: 8088, province: nil, pobox: nil, latitude: nil, longitude: nil, validfrom: nil, validto: nil, label: nil, description: nil, contact_id: 71, addresstype_id: 63, country_id: 63&gt;] 1.9.3p0 :005 &gt; c.addresses =&gt; [#&lt;Address id: 63, active: true, standard: false, street: "Mustergasse 123", extraline1: nil, extraline2: nil, city: "Musterhausen", zip: 8088, province: nil, pobox: nil, latitude: nil, longitude: nil, validfrom: nil, validto: nil, label: nil, description: nil, contact_id: 71, addresstype_id: 63, country_id: 63&gt;] 1.9.3p0 :006 &gt; c.save! =&gt; true 1.9.3p0 :007 &gt; c.reload 1.9.3p0 :008 &gt; c.addresses =&gt; [#&lt;Address id: 63, active: true, standard: false, street: "Mustergasse 123", extraline1: nil, extraline2: nil, city: "Musterhausen", zip: "8088", province: nil, pobox: nil, latitude: nil, longitude: nil, validfrom: nil, validto: nil, label: nil, description: nil, contact_id: 71, addresstype_id: 63, country_id: 63&gt;] </code></pre> <p>Everything works as expected, the Address#63 now belongs to Contact#71.</p> <p>I then read <a href="https://stackoverflow.com/a/11327575/1439143">here</a> that it doesn't make much sense to validate the presence of the belongs_to relationship name, but that I should validate its foreign key, and so I did:</p> <pre><code>class Address &lt; ActiveRecord::Base belongs_to :contact validates :contact_id, :presence =&gt; true # ... end </code></pre> <p>So here's the Rails console's log for exactly the same commands like above:</p> <pre><code>1.9.3p0 :009 &gt; c = FactoryGirl.create :contact =&gt; #&lt;Contact id: 84, corporate: false, companyname: nil, firstname: nil, middlename: nil, lastname: "Doe", initials: nil, nickname: nil, gender: "male", title: nil, profession: nil, department: nil, birthday: nil, spouse: nil, kids: nil, superior: nil, assistant: nil, contacttype_id: 84, language_id: nil&gt; 1.9.3p0 :010 &gt; a = FactoryGirl.create :address =&gt; #&lt;Address id: 74, active: true, standard: false, street: "Mustergasse 123", extraline1: nil, extraline2: nil, city: "Musterhausen", zip: 8088, province: nil, pobox: nil, latitude: nil, longitude: nil, validfrom: nil, validto: nil, label: nil, description: nil, contact_id: 85, addresstype_id: 74, country_id: 74&gt; 1.9.3p0 :011 &gt; c.addresses =&gt; [] 1.9.3p0 :012 &gt; c.addresses &lt;&lt; a =&gt; [#&lt;Address id: 74, active: true, standard: false, street: "Mustergasse 123", extraline1: nil, extraline2: nil, city: "Musterhausen", zip: 8088, province: nil, pobox: nil, latitude: nil, longitude: nil, validfrom: nil, validto: nil, label: nil, description: nil, contact_id: 85, addresstype_id: 74, country_id: 74&gt;] 1.9.3p0 :013 &gt; c.addresses =&gt; [#&lt;Address id: 74, active: true, standard: false, street: "Mustergasse 123", extraline1: nil, extraline2: nil, city: "Musterhausen", zip: 8088, province: nil, pobox: nil, latitude: nil, longitude: nil, validfrom: nil, validto: nil, label: nil, description: nil, contact_id: 85, addresstype_id: 74, country_id: 74&gt;] =&gt; true 1.9.3p0 :015 &gt; c.reload =&gt; #&lt;Contact id: 84, corporate: false, companyname: nil, firstname: nil, middlename: nil, lastname: "Doe", initials: nil, nickname: nil, gender: "male", title: nil, profession: nil, department: nil, birthday: nil, spouse: nil, kids: nil, superior: nil, assistant: nil, contacttype_id: 84, language_id: nil&gt; 1.9.3p0 :016 &gt; c.addresses =&gt; [] </code></pre> <p>As you can see, the address wasn't properly assigned to the contact! Its <code>:contact_id</code> stayed 85 although it should have changed after <code>c.addresses &lt;&lt; a</code>! Even scarier, when I remove the whole validation, it <strong>also</strong> doesn't work!</p> <pre><code>1.9.3p0 :009 &gt; c = FactoryGirl.create :contact =&gt; #&lt;Contact id: 97, corporate: false, companyname: nil, firstname: nil, middlename: nil, lastname: "Doe", initials: nil, nickname: nil, gender: "male", title: nil, profession: nil, department: nil, birthday: nil, spouse: nil, kids: nil, superior: nil, assistant: nil, contacttype_id: 97, language_id: nil&gt; 1.9.3p0 :010 &gt; a = FactoryGirl.create :address =&gt; #&lt;Address id: 85, active: true, standard: false, street: "Mustergasse 123", extraline1: nil, extraline2: nil, city: "Musterhausen", zip: 8088, province: nil, pobox: nil, latitude: nil, longitude: nil, validfrom: nil, validto: nil, label: nil, description: nil, contact_id: 98, addresstype_id: 85, country_id: 85&gt; 1.9.3p0 :011 &gt; c.addresses =&gt; [] 1.9.3p0 :012 &gt; c.addresses &lt;&lt; a =&gt; [#&lt;Address id: 85, active: true, standard: false, street: "Mustergasse 123", extraline1: nil, extraline2: nil, city: "Musterhausen", zip: 8088, province: nil, pobox: nil, latitude: nil, longitude: nil, validfrom: nil, validto: nil, label: nil, description: nil, contact_id: 98, addresstype_id: 85, country_id: 85&gt;] 1.9.3p0 :013 &gt; c.addresses =&gt; [#&lt;Address id: 85, active: true, standard: false, street: "Mustergasse 123", extraline1: nil, extraline2: nil, city: "Musterhausen", zip: 8088, province: nil, pobox: nil, latitude: nil, longitude: nil, validfrom: nil, validto: nil, label: nil, description: nil, contact_id: 98, addresstype_id: 85, country_id: 85&gt;] 1.9.3p0 :014 &gt; c.save! =&gt; true 1.9.3p0 :015 &gt; c.reload =&gt; #&lt;Contact id: 97, corporate: false, companyname: nil, firstname: nil, middlename: nil, lastname: "Doe", initials: nil, nickname: nil, gender: "male", title: nil, profession: nil, department: nil, birthday: nil, spouse: nil, kids: nil, superior: nil, assistant: nil, contacttype_id: 97, language_id: nil&gt; 1.9.3p0 :016 &gt; c.addresses =&gt; [] </code></pre> <p>Again, the very same scenario that the <code>:contact_id</code> does not change...</p> <p>Any help is highly appreciated, I've wasted about 6 hours already investigating this problem...</p> <p><strong>Update</strong></p> <p>The reason why I'm asking is that I have the following in an RSpec file:</p> <pre><code>let (:contact) do contact = create(:contact) contact.addresses &lt;&lt; create(:address) contact end </code></pre> <p>As said, this works with <code>validates :project, :presence =&gt; true</code>, but it doesn't without any validation or with <code>validates :project_id, :presence =&gt; true</code>.</p> <p>I could write it like this, so it works with <code>validates :project_id, :presence =&gt; true</code>, but it's just not how I guess it should behave (and it's not really DRY).</p> <pre><code>let (:contact) do contact = create(:contact) contact.addresses &lt;&lt; create(:address, :contact =&gt; contact) contact end </code></pre>
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