simple_form select-field turns into input-field after validation - ruby-on-rails

Question

I'm using simple_form combined with twitter boostrap for my rails application. And I've one problem that stops me.
<%= f.input :title %>
<%= f.input :url %>
<%= f.input :tag_list, :label => 'Tags' %>
<%= f.input :type_id, :collection => #types, :label_method => :type_name, :value_method => :id, :include_blank => false %>
<%= f.input :description %>
That creates me nice form. But when the validation fails every input-field shows their error.
But not the select field, it only changes from a select-field into a normal input-field filled with the id and I don't know why.
Any ideas?

Answer 1

For some reasons, it seems Rails + Bootstrap + Simple_form keep you select field after validation when the collection is placed into the field itself instead of your controller's action. This should work :
<%= f.input :title %>
<%= f.input :url %>
<%= f.input :tag_list, :label => 'Tags' %>
<%= f.input :type_id, :collection => Type.all.order('type_name'), :label_method => :type_name, :value_method => :id, :include_blank => false %>
<%= f.input :description %>
Hope this helps.

Answer 2

Well I would need more information to help you out.
Could you post your models? or explain what #types is and what it is for.
This is a basic simple for association:
models/type.rb
belongs_to :post
models/post.rb
has_many :types
views/post/_form.html.haml
= f.association :types
Make sure you have a column named "title" or "name" for types.

Answer 3

You need to set #types in methods create or update before render action new or edit respectively
For example
def new
#your_object = YourObject.new
#types = Type.all
....
end
def create
#your_object = YourObject.new(your_object_params)
respond_to do |format|
if #your_object.save
format.html { redirect_to ... }
format.json { render action: 'show' ... }
else
### ! init data for the form ! ###
#types = Type.all
format.html { render action: 'new' }
format.json { render json: ... }
end
end
end