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PORails Validate child with parent
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copied!<p>I have a nested Form</p> <p>A Crew can have many meetings, a Meeting can belong to one Crew. A Crew, and a Meeting can both have set a gender_id attribute.</p> <p>I want to add an error to the Meeting object when Crew.meeting_id != Meeting.gender_id</p> <p>I have written a simple validator</p> <pre><code>class MeetingGenderValidator < ActiveModel::EachValidator def validate_each(record, attribute, value) if record.gender_id != record.crew.gender_id msg = :wrong_gender case record.crew.gender_id when 1 then msg = :crew_woman_only when 2 then msg = :crew_man_only record.errors.add(attribute, msg, options) end end end end </code></pre> <p>The problem is, When this validator is run, The record variable (our Meeting model), is not yet associated with the Crew model, so I get an error on calling Nil.gender_id</p> <p>Here is the part of Meeting model:</p> <pre><code>class Meeting < ActiveRecord::Base belongs_to :crew validates :gender_id, :meeting_gender => true end </code></pre> <p>Here is the part of Crew model with the association:</p> <pre><code>class Crew < ActiveRecord::Base has_many :meetings accepts_nested_attributes_for :meetings end </code></pre> <p>And my Crews#Create action snippet (controller):</p> <pre><code>class CrewsController < ApplicationController def create @crew = Crew.new(params[:crew]) # here are the meeting params too @crew.user = current_user # assigning the user from session / not important here if @crew.save ...... end end </code></pre>

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