Rails - May 2013 - Ransack, acts-as-taggable-on and checkboxes in search form

need some help on ransack filtering.

I have model Project, which has many tags through acts_as_taggable gem.
Project.rb:

    class Project < ActiveRecord::Base
      include PublicActivity::Common

      belongs_to :customer
      belongs_to :category
      has_many :attachments, :as => :attachable
      has_many :reports, :dependent => :destroy
      has_many :messages, :dependent => :destroy
      has_many :screens, :dependent => :destroy

      accepts_nested_attributes_for :attachments, :allow_destroy => true

      acts_as_taggable
    end

so the @project.tags - works in console just fine.

However, I have advanced search form with ransack gem on index page, and i 
need to filter projects depending on tags which are selected by user. So 
that only projects which have all of the selected tags were displayed.

Also a have categories, projects belong to categories. So the checkboxes 
for categories work as expected. But how can i do checkboxes for tags? 
Here''s my form for search:

    = search_form_for @search do |f|
      - @categories.each do |category|
        = check_box_tag(''q[category_id_eq_any][]'',
category.id)
          = category.name
      = f.text_field :budjet_gteq
      = f.text_field :budjet_lteq
      - @tags.each do |tag|
        = check_box_tag(''q[tags_id_eq_all][]'', tag.id)
        = tag.name

That''s what i have in console after submiting the form (so i have no
tags
query at all, even though i checked two checkboxes):

    Processing by ProjectsController#index as HTML
      Parameters: {"utf8"=>"✓",
"q"=>{"category_id_eq_any"=>["1"],
"budjet_gteq"=>"100000",
"budjet_lteq"=>"70000000"}}

Any help will be appreciated.

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Edited my view, so now checkboxes for tags look like:

  - @tags.each do |tag|
    = check_box_tag("q[tags_id_eq_all][]", tag.id, {})
    = tag.name

So in console i can see such query:

Processing by ProjectsController#index as HTML
  Parameters: {"utf8"=>"✓",
"q"=>{"budjet_gteq"=>"",
"budjet_lteq"=>"",
"tags_id_eq_all"=>["1", "2", "3",
"4", "5", "6"]}}

So now, it passes all tags, even though i''ve selected only two of them.
As
the result it shows all projects, when i want to show only one, with two 
tags which i''ve checked.

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Now i''ve played a bit and see that when in view i have:

  - @tags.each do |tag|
    = check_box_tag("q[tags_id_eq_all][]", tag.id, {})
    = tag.name

every checkbox in html is set to "checked" by default.
If i make it false, like this:

  - @tags.each do |tag|
    = check_box_tag("q[tags_id_eq_all][]", tag.id, false, {})
    = tag.name

Checkboxes are nit checked by default, but it doesn''t send query with 
tags_ids array at all, even if i click on them.
Can''t figure out, how can i get it working..

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Sorry guys, problem was not in Ransack or checkboxes. it''s all about
html
and styles, as checkboxes simply didn''t get checked when i clicked
them.
Fixing styles helped

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