Rails, array of objects form

Question

I'm developing a rails application.

I want the user to be able to make a selection between an array of models

In one controller, I create an array of models.

def myController
 @data = []
 @data += [MyData.find(2)]
 @data += [MyData.find(5)]
 @data += [MyData.find(7)]
end

In the view, I can't use the form_for because can't be used in an array, so I have:

<%= form_tag 'myOp' do |f|%>
 <%= fields_for :test, @data do |builder|%>
  <%= render 'sub_form', :f => builder %>
 <% end %>
<% end %>

Now in the sub_form, I want to recieve each of the items of the array, but instead, I'm getting the full array.

How can I get each of the items of the array in the subform?

Is there a better way to do this?

Thanks

Raindal · Accepted Answer · 2013-09-19 16:06:30Z

2

So first in your controller

def my_action
    @datas = MyData.find(2, 5, 7)
end

Then in your view

You need to iterate through the @datas array and yield the fields for each object. That is because fields_for yields fields for one object only, not arrays of objects.

<%= form_tag 'myOp' do |f|%>
    <% @datas.each_with_index do |data, i| %>
        <%= fields_for "test_#{i}", data do |builder|%>
            <%= render 'sub_form', :f => builder %>
        <% end %>
    <% end %>
<% end %>

edited Sep 19, 2013 at 16:06

answered Sep 19, 2013 at 15:34

Raindal

3,23717 silver badges14 bronze badges

Sign up to request clarification or add additional context in comments.

1 Comment

Mateu Over a year ago

.@data = [] .@data += [MyData.find(2)] .@data += [MyData.find(5)] .@data += [MyData.find(7)] is an array of objects. Not an array of arrays.

Rajesh Omanakuttan · Accepted Answer · 2013-09-19 11:51:54Z

0

I hope this will correct the issue:

<%= form_tag 'myOp' do |f|%>
 <%= fields_for :test, @data.each do |builder|%>
  <%= render 'sub_form', :f => builder %>
 <% end %>
<% end %>

Normally an array object can be seperated using .each method. May that would work here also. Try it.

answered Sep 19, 2013 at 11:51

Rajesh Omanakuttan

6,9388 gold badges50 silver badges88 bronze badges

2 Comments

Mateu Over a year ago

The code that I posted usually workd on a form_for. The one that you posted is not working. The subform is recieving an Enumerator.

AOphagen Over a year ago

It works as describe here, but it is necessary to allow the owning model of form 'f' to access the data attributes in order to be able to add fields to form 'builder'. Took me quite a while to find that gap in my program. has_many :datas, accepts_nested_attributes_for :datas

Collectives™ on Stack Overflow

Rails, array of objects form

2 Answers 2

So first in your controller

Then in your view

1 Comment

2 Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

So first in your controller

Then in your view

1 Comment

2 Comments

Your Answer

Sign up or log in

Post as a guest

Related