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POMongoid: If possible, how to assign a parent to pre-existing child?
 

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  1. POMongoid: If possible, how to assign a parent to pre-existing child?
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    <p>In a model definition can you have more than one belongs_to statement? If the answer is no, read no further. I am trying to create three 1-n referenced relationships with mongoid in a sinatra app. </p> <h1>models</h1> <pre><code>class SkillTrack include Mongoid::Document belongs_to :student belongs_to :grading_period belongs_to :teacher end class Student include Mongoid::Document field :name field :nickname field :dob, type: Date has_many :skill_tracks end class GradingPeriod include Mongoid::Document field :school_year field :period_name field :signing_date, type: Date has_many :skill_tracks end class Teacher include Mongoid::Document field :name has_many :skill_tracks end </code></pre> <h1>routes</h1> <pre><code>post "/skill_track/new" do form = params[:formdata] # using sinatra form helpers gem student = Student.find("#{formdata["student_mongo_id"]}") working = (student.skill_tracks.create).id ??? what do I do with working to make it a child of a teacher and of a grading_period? end </code></pre> <h1>what I have tried</h1> <p>The thing that looked the most promising to me from the <a href="http://mongoid.org/en/mongoid/docs/relations.html#has_many" rel="nofollow">mongoid docs</a> was:</p> <pre><code>band.member_ids = [ id ] #Set the related document ids. </code></pre> <p>I mucked about in irb and tried lots of variations in my models but I could not set a parent teacher or grading period for the newly created skilltracking object. The student foreign key was set properly on creation. I am hoping I have a simple syntax ignorance, but I tried so many variations I wonder if I can do this at all. </p> <h1>UPDATE:</h1> <p>I just needed to add working.save to David Troyer answer and boom working.</p> <pre><code>post "/skill_track/new" do form = params[:formdata] student = Student.find("#{formdata["student_mongo_id"]}") working = student.skill_tracks.create working.teacher = Teacher.create # or find working.grading_period = GradingPeriod.create # or find working.save end </code></pre>
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