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POHow to associate a new model with existing models using has_and_belongs_to_many
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  1. POHow to associate a new model with existing models using has_and_belongs_to_many
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    copied!<p>I have two models with a many to many relationship using <code>has_and_belongs_to_many</code>. Like so:</p> <pre><code>class Competition &lt; ActiveRecord::Base has_and_belongs_to_many :teams accepts_nested_attributes_for :teams end class Team &lt; ActiveRecord::Base has_and_belongs_to_many :competitions accepts_nested_attributes_for :competitions end </code></pre> <p>If we assume that I have already created several Competitions in the database, when I create a new Team, I would like to use a nested form to associate the new Team with any relevant Competitions.</p> <p>It's at this point onwards that I really do need help (have been stuck on this for hours!) and I think my existing code has already gone about this the wrong way, but I'll show it just in case:</p> <pre><code>class TeamsController &lt; ApplicationController def new @team = Team.new @competitions.all @competitions.size.times {@team.competitions.build} end def create @team = Team.new params[:team] if @team.save # .. usual if logic on save end end end </code></pre> <p>And the view... this is where I'm really stuck so I won't both posting my efforts so far. What I'd like it a list of checkboxes for each competition so that the user can just select which Competitions are appropriate, and leave unchecked those that aren't.</p> <p>I'm really stuck with this one so appreciate any pointing in the right direction you can provide :)</p>
 

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