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POundefined method 'delete' for String:Class when using Mongoid and creating records via console
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  1. POundefined method 'delete' for String:Class when using Mongoid and creating records via console
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    copied!<p>I have a class that looks like this: </p> <pre><code>class SearchService include Mongoid::Document key :name, String field :url, String field :searchBaseUrl, String validates_presence_of :name, :url, :searchBaseUrl validates_uniqueness_of :name end </code></pre> <p>The first issue here is that I was using <code>validates_presence_of</code> incorrectly or so it would seem. I commented the line out and I could create the class instance at the console with no problem. But when I tried to create the object with validates_presence_of in place I got an error: </p> <pre><code>NoMethodError: undefined method `delete' for String:Class from D:/Ruby193/lib/ruby/gems/1.9.1/gems/mongoid-2.3.3/lib/mongoid/fields.rb:230:in `add_field' from D:/Ruby193/lib/ruby/gems/1.9.1/gems/mongoid-2.3.3/lib/mongoid/fields.rb:145:in `field' </code></pre> <p>Is this error message meaningful? I'm having a hard time seeing the relationship between a missing method on the String class and me using <code>validates_presence_of</code> incorrectly. If I could pick only one thing about Ruby that bugs me it would have to be terrible error messages. </p> <p>The <a href="http://api.rubyonrails.org/classes/ActiveRecord/Validations/ClassMethods.html" rel="nofollow">rails docs</a> say that validates_presence_of is for association. But the <a href="http://www.mongodb.org/display/DOCS/MongoDB+Data+Modeling+and+Rails" rel="nofollow">mongo db page</a> says that it's used for required fields. Are the mongodb docs incorrect? </p> <p>I'm trying to decide if this is an issue I should report to the mongoid team or if I'm just not understanding how the language works. </p> <p><strong>Update</strong>: OK now I'm getting a very similar error in a class that doesn't use validates_presence_of at all. So it's some other issue (even though commenting out that line fixed it initially). </p> <p><strong>Update2</strong>: This appears to me to be bug in mongoid. Changing this line: </p> <p><code>field :name</code> to <code>field :name, String</code></p> <p>will cause the error to show up. Seems that any field that is defined with a type will mess up mongoid. Or those aren't supposed to be there anymore? The mongodb docs (linked above) have code that looks like <code>key :votes, Integer, :default =&gt; 0</code> so if it isn't valid the docs are wrong. </p> <p>Rails 3.1.1, Ruby 1.9.3</p>
 

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