Nested forms issue - rails

Question

I have some rails nested forms

    = form_for @model do |f|
    ...
      = f.fields_for :user_partnership do |builder|
        - user_partners.each do |index|
          = builder.hidden_field :user_partner_id
          = content_tag(:li,index.name)

In my model I have set has_many :user_partner, through: :users_partnership.

So now I have two problems : the first, I have no input inside the fields_for process. So, following some SO posts, I had to add this

@model = model.new
@user_partners = User_Partner.all
@user_partners.count.times{@model.users_partnership.build}

but this really seam awkward. The secound question is how I get the enumerator of the fields_for block so I can set correctly index.name ?

Edit, here's my models

class model
  has_many :user_partners, through: :users_partnerships
  accepts_nested_attributes_for :users_partnerships
end

class User_Partner
  has_many :models, through: :users_partnerships
end

class Users_Partnership
  belongs_to :model
  belongs_to :user_partner
end

It feels like there are so many missing connections, can you post your models in question and explain a little more what you are trying to do. — vee
– vee, Commented Aug 21, 2013 at 22:37
Are you sure your model class is infact all lower-case, and the other two classes have underscore in them? Also, don't they inherit from ActiveRecord::Base? More importantly what I want another clarification is what is users in your view, where does it come from? — vee
– vee, Commented Aug 21, 2013 at 22:56
@vinodadhikary sorry i have edited my post, it is in fact user_partners and not users. Btw, I tried ` = builder.options[:child_index]` to see if the index was showing, but nothong was displayed — user1611830
– user1611830, Commented Aug 21, 2013 at 23:27

epsilones · Accepted Answer · 2013-08-22 00:18:24Z

First, fields_for creates a scope around model and not tag inside. So, as far as I know you have, you should build it from controller the appropriate models you want to loop through.

Second, since you indicated in some comment that = builder.options[:child_index] didn't work and that there are as many user_partners as user_partnerships, you can try this :

= @model.user_partnerships.each.with_index do |user_partnership,index|
    = f.fields_for :user_partnerships, user_partnership do |builder|
      %ul
        = builder.hidden_field :user_id
        = content_tag(:li, :id => "#{users[index].name})"

Btw, the iterator for fields_for seems to have been a long standing question, and it was expected that would come with rails 3.2 some method fields_for_with_index. I found this post interesting, but in my rails 3.2.13, I didn't find any method of this kind. So perhaps, we can rely on *.options[:child_index] but I never tested it !

Charles · Accepted Answer · 2013-08-21 23:07:10Z

0

If I am understanding your question correctly, you need fields for user_partners for each instance of users.

In your controller you need

@instance_variable = @model.user_partnership.build

Then you should loop over the users and build a form for each instance.

= form_for @model do |f|
...
 - users.each do |index|
  = f.fields_for :user_partnership do |builder|
      = builder.hidden_field :user_partner_id
      = content_tag(:li,index.name)

Like others have pointed out your classes should inherit from activerecord and you to check the case and pluralization. Give the guide a read. http://edgeguides.rubyonrails.org/active_record_basics.html

answered Aug 21, 2013 at 23:07

Charles

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