CODEWITHSUNDEEP
ruby-on-railsrails-activerecord
no_lyf_programmer
no_lyf_programmer

Reputation: 595

change has_many to has_one relation

I'm trying to convert models from has_many relation to has_one here is my code

models

class Activity < ActiveRecord::Base

  has_many :product_outline_attribute, dependent: :destroy

  accepts_nested_attributes_for :product_outline_attribute

end

class ProductOutlineAttribute < ActiveRecord::Base

  belongs_to :activity

end

controller

class ActivitiesController < ProductOutlinesController

  def new
    @activity = Activity.new
    @activity.product_outline_attributes.new()
    render layout: false
  end

end

View

new.html.haml

.panel
  = form_for ([ @activity]), html: { class: 'ajax_form' } do |f|

    = render partial: 'product_outlines/form_activity_section', locals: { f: f }

form_activity_section.html.haml

= f.fields_for :product_outline_attribute do |ff_poa|
    = ff_poa.label :depth_of_knowledge
    = ff_poa.select :depth_of_knowledge, DEPTH_OF_KNOWLEDGE_LEVELS.map{ |k,v| [v,k] }, prompt: ( ff_poa.object.depth_of_knowledge.blank? ? 'Select Level' : nil )

earlier same code with has_many relation works because

@activity.product_outline_attributes.new returns an object

but with has_one

@activity.product_outline_attribute is nil

@activity.product_outline_attribute.new raises an exception

it makes sense after reading rails guide

Could someone help me on overcoming this issue.

Upvotes: 0

Views: 152

Answers (1)

Evan
Evan

Reputation: 571

If activity has_one product_outline_attribute. You must new an instance by codes like this:

 @activity.build_product_outline_attribute

Upvotes: 2

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