Databases
StackOverflow2013
Postsdbo
POHow to set polymorphic relations using Fabricator-gem?
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POHow to set polymorphic relations using Fabricator-gem?
    primarykey
    data
    text
    <p>I am trying to setup fabricator-gem to handle my models for testing. The problem I am running into is that it doesn't seem to be able to handle polymorphic relations. I am using MongoDB as my database and Mongoid as my ORM. Consider this example:</p> <pre><code>class Description include Mongoid::Document include Mongoid::Timestamps embeds_many :images, as: :photo, cascade_callbacks: true end class Image include Mongoid::Document include Mongoid::Timestamps embedded_in :photo, polymorphic: true end </code></pre> <p>Using this code, you can embed Image documents into many different types of documents, because you set <code>polymorphic: true</code>. This turns out to be a problem when using fabricator, because you would like to do something like this: </p> <pre><code>Fabricator(:description) do |f| f.images(count: 1) { |description, i| Fabricate(:image, photo: description) } end </code></pre> <p>But Fabricator-gem automatically assumes there must be a class named Photo. Therefore, when you run your tests, the following error is thrown: </p> <pre><code>NameError: uninitialized constant Photo </code></pre> <p>How do I tell Fabricator that this is a polymorphic association?</p> <p>EDIT: Stacktrace Here:</p> <pre><code>NameError: uninitialized constant PhotoOf from /Users/max/.rvm/gems/ruby-1.9.3-p362/gems/activesupport-3.2.11/lib/active_support/inflector/methods.rb:230:in `block in constantize' from /Users/max/.rvm/gems/ruby-1.9.3-p362/gems/activesupport-3.2.11/lib/active_support/inflector/methods.rb:229:in `each' from /Users/max/.rvm/gems/ruby-1.9.3-p362/gems/activesupport-3.2.11/lib/active_support/inflector/methods.rb:229:in `constantize' from /Users/max/.rvm/gems/ruby-1.9.3-p362/gems/activesupport-3.2.11/lib/active_support/core_ext/string/inflections.rb:54:in `constantize' from /Users/max/.rvm/gems/ruby-1.9.3-p362/gems/mongoid-3.0.17/lib/mongoid/relations/metadata.rb:602:in `klass' from /Users/max/.rvm/gems/ruby-1.9.3-p362/gems/mongoid-3.0.17/lib/mongoid/relations/builders/nested_attributes/one.rb:33:in `build' from /Users/max/.rvm/gems/ruby-1.9.3-p362/gems/mongoid-3.0.17/lib/mongoid/attributes/processing.rb:170:in `block in process_relations' from /Users/max/.rvm/gems/ruby-1.9.3-p362/gems/mongoid-3.0.17/lib/mongoid/attributes/processing.rb:167:in `each_pair' from /Users/max/.rvm/gems/ruby-1.9.3-p362/gems/mongoid-3.0.17/lib/mongoid/attributes/processing.rb:167:in `process_relations' from /Users/max/.rvm/gems/ruby-1.9.3-p362/gems/mongoid-3.0.17/lib/mongoid/attributes/processing.rb:153:in `process_pending' from /Users/max/.rvm/gems/ruby-1.9.3-p362/gems/mongoid-3.0.17/lib/mongoid/attributes/processing.rb:32:in `block in process_attributes' from /Users/max/.rvm/gems/ruby-1.9.3-p362/gems/mongoid-3.0.17/lib/mongoid/attributes/processing.rb:193:in `with_mass_assignment' from /Users/max/.rvm/gems/ruby-1.9.3-p362/gems/mongoid-3.0.17/lib/mongoid/attributes/processing.rb:22:in `process_attributes' from /Users/max/.rvm/gems/ruby-1.9.3-p362/gems/mongoid-3.0.17/lib/mongoid/document.rb:148:in `block in initialize' from /Users/max/.rvm/gems/ruby-1.9.3-p362/gems/mongoid-3.0.17/lib/mongoid/threaded/lifecycle.rb:84:in `_building' from /Users/max/.rvm/gems/ruby-1.9.3-p362/gems/mongoid-3.0.17/lib/mongoid/document.rb:143:in `initialize' ... 33 levels... from /Users/max/.rvm/gems/ruby-1.9.3-p362/gems/fabrication-2.5.4/lib/fabrication/generator/base.rb:91:in `block in process_attributes' from /Users/max/.rvm/gems/ruby-1.9.3-p362/gems/fabrication-2.5.4/lib/fabrication/generator/base.rb:90:in `each' from /Users/max/.rvm/gems/ruby-1.9.3-p362/gems/fabrication-2.5.4/lib/fabrication/generator/base.rb:90:in `process_attributes' from /Users/max/.rvm/gems/ruby-1.9.3-p362/gems/fabrication-2.5.4/lib/fabrication/generator/base.rb:6:in `build' from /Users/max/.rvm/gems/ruby-1.9.3-p362/gems/fabrication-2.5.4/lib/fabrication/generator/base.rb:26:in `create' from /Users/max/.rvm/gems/ruby-1.9.3-p362/gems/fabrication-2.5.4/lib/fabrication/schematic/definition.rb:62:in `block in fabricate' from /Users/max/.rvm/gems/ruby-1.9.3-p362/gems/fabrication-2.5.4/lib/fabrication/schematic/definition.rb:61:in `instance_eval' from /Users/max/.rvm/gems/ruby-1.9.3-p362/gems/fabrication-2.5.4/lib/fabrication/schematic/definition.rb:61:in `fabricate' from /Users/max/.rvm/gems/ruby-1.9.3-p362/gems/fabrication-2.5.4/lib/fabrication/fabricator.rb:10:in `fabricate' from /Users/max/.rvm/gems/ruby-1.9.3-p362/gems/fabrication-2.5.4/lib/fabrication.rb:51:in `Fabricate' from (irb):1 from /Users/max/.rvm/gems/ruby-1.9.3-p362/gems/railties-3.2.11/lib/rails/commands/console.rb:47:in `start' from /Users/max/.rvm/gems/ruby-1.9.3-p362/gems/railties-3.2.11/lib/rails/commands/console.rb:8:in `start' from /Users/max/.rvm/gems/ruby-1.9.3-p362/gems/railties-3.2.11/lib/rails/commands.rb:41:in `&lt;top (required)&gt;' from script/rails:6:in `require' from script/rails:6:in `&lt;main&gt;' </code></pre>
    singulars
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. USMax
    1. USMax
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. This table or related slice is empty.
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload