Rails4: collection_check_boxes from array

Question

There is some way to serialize a collection_check_boxes from one constant? Something like this:

# model
class tutorial < ActiveRecord::Base
  serialize :option
  TYPES = ["Option 1", "Option 2", "Option 3"]
end

# view
<%= form_for(@tutorial) do |b| %>
  <%= f.collection_check_boxes(:option, Tutorial::TYPES, :id, :name) do |b| %>
         <%= b.label class:"label-checkbox" do%>
         <%=b.check_box + b.text%>
      <%end%>
   <% end %>
<% end %>

Or just:

<%= f.collection_check_boxes :option, Tutorial::TYPES, :id, :name %>

When I try both it I get the error:

undefined method `id' for "Option\t1":String

My permit parameters are already set with option: []

Someone did something like that before?

Thanks!

Vasili · Accepted Answer · 2017-03-31 22:40:03Z

1

The definition is:

collection_check_boxes(method, collection, value_method, text_method, options = {}, html_options = {}, &block)`

The first one is a method to send, the second is a collection, the third is a method which is called to set an option value property, and the fourth is a method that is called to get a text and place it as a label for an option.

<%= f.collection_check_boxes :option, Tutorial::TYPES, :id, :name %>

There you are using Tutorial::TYPES (which is an array if strings) as a collection, and call id and name methods on each string.

Your collection should be Tutorial.all, and to get a label, you should implement a method on a Tutorial object for that, for example:

enum type: [
  :type1,
  :type2,
  :type3,
]

And use it like this:

<%= f.collection_check_boxes :option, Tutorial.all, :id, :type %>

answered Mar 31, 2017 at 22:40

Vasili

9057 silver badges12 bronze badges

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

4 Comments

Fernando Aureliano Over a year ago

But using 'Tutorial.all' I do a query from model. This is exactly what I do not want to do. Whats I need is call it from array, like we do when we use the 'select' helper: <%= f.select(:lang, options_for_select(User::LANGS, @user.lang), {}, {} ) %>

Vasili Over a year ago

@FernandoAureliano okay, then two last elements should not be :id and :name because these are methods that you call on each element of collection, so you're trying to call :id and :name on "Option 1":String. You can change TYPES to hash where keys or values are indices, and use it like that: <%= f.collection_check_boxes :option, Tutorial::TYPES, :key, :value %>.

Fernando Aureliano Over a year ago

Got the same error undefined method key' for [1, using an array like: [[1, "option 1"], [2, "option 2"], [3, "option 3"]]

Vasili Over a year ago

@FernandoAureliano of course, if you're using an array, there's no key or value methods. You should use :first and :last instead.

Collectives™ on Stack Overflow

Rails4: collection_check_boxes from array

1 Answer 1

4 Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

4 Comments

Your Answer

Sign up or log in

Post as a guest

Related