Nested parameters in rails 3

Question

I have two models:- a) A b) B

model A looks like this:-

class A < ActiveRecord::Base

has_many :bs ,:dependent => :destroy   
validates :name, :presence=>true
accepts_nested_attributes_for :bs
attr_accessible :bs_attributes

end

model B looks like this

class PlanDay < ActiveRecord::Base

belongs_to :a
attr_accessible :a_attributes

end

In my view I have used form_for and fields_for, but I am confused in the parameter that I am getting:-

 Parameters: {"a"=>{"name"=>"swsdw" , "bs_attributes"=>{"0"=>{"friday"=>"true", "wednesday"=>"", "tuesday"=>"", "sunday"=>"true", "saturday"=>"true", "monday"=>"", "thursday"=>""}}

What is this 0 I am getting in bs_attributes? Is this the reason that I am not able to save the values of my days in 'bs' table?

I am saving this as follow:- @a = A.new(params[:a])

and this is saving my both the models are getting saved , but the all the days that are present in parameters are getting saved with null.

prasvin · Accepted Answer · 2012-02-17 12:31:29Z

2

A has a has_many relationship with B. So, the bs_attributes will actually be an array containing multiple Bs. So, 0 means the first B. If you had passed two Bs, then there would have been 0 as above and an additional hash beginning with 1.

I dont think the 0 is causing B to have null values. And 0 is not causing a problem because you are able to save multiple bs when saving A.

You stated "I am saving this as follow:- @a = A.new(params[:a])". Did you not save @a or you forgot to include it in your question ? Add @a.save! after that. The bang(!) will show you the failed validations if @a is not saved.

answered Feb 17, 2012 at 12:31

prasvin

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