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POMongoid Map Reduce with has_one
 

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    <p>I am using Mongoid and MongoDB in an application I am making. I have a user that has one profile like so:</p> <pre><code>class User field :email, :type =&gt; String field :name, :type =&gt; String field :date_of_birth, :type =&gt; DateTime has_one :profile end class Profile field :votes, :type =&gt; Hash field :biography, :type =&gt; String belongs_to :profile end </code></pre> <p>The votes hash is structured like so:</p> <pre><code>profile : { "user_id" : ObjectId("511b76b0e80c505750000031"), "votes": { "vote_count": 3, "up_votes": 3, "down_votes": 0 } } </code></pre> <p>I am running map reduce like so:</p> <pre><code>map = " function () { values = { name: this.name } emit(this._id, values); } " reduce = " function (key, emits) { return emits; } " User.map_reduce(map, reduce).out(replace: "leaderboards").each do |document| ap document end </code></pre> <p>This works fine and creates a new collection in Mongo called leaderboards. However I am trying to map some data from the profile so it includes the vote_count field from the profile.</p> <p>Essentially making my map function look like so:</p> <pre><code>map = " function () { values = { name: this.name, votes: this.profile.votes.vote_count } emit(this._id, values); } " </code></pre> <p>However I am have difficulty grabbing the profile associated with the user. Does anyone know how I can pull the data from the users profile?</p> <p>If something isn't clear here let me know. Any help would be appreciated.</p> <p>Tony</p>
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    1. USTony Petley
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