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Dealing with has_many through checkboxes in a nested form
= semantic_form_for @raduser do |f|
  %ul
    %li
      = f.text_field :expiration, :placeholder => 'Expiration Date', :id => 'expiration_date'
    - f.fields_for :radcheck do |builder|
      = builder.text_field :username, :placeholder => 'Stuff'
      -Radgroup.all.each do |group|
        %li
          = check_box_tag 'radcheck[radgroup_ids]', group.id, @radcheck.radgroup_ids.include?(group.id)
          = group.groupname

    %li
      = f.submit

undefined method `radgroup_ids' for #<ActiveRecord::Relation:0x007faaa24c2468>

class Raduser < ActiveRecord::Base

  has_many :radcheck, :dependent => :destroy
  accepts_nested_attributes_for :radcheck, :reject_if => lambda { |a| a[:value].blank? }, :allow_destroy => true

end

class Radcheck < ActiveRecord::Base
  self.table_name = 'radcheck'

  attr_accessible :attribute_name, :username, :value, :op, :radgroupcheck_id, :radcheck_serial, :radgroup_ids

  belongs_to :raduser

  has_many :radusergroup, :dependent => :destroy
  has_many :radgroup, :through => :radusergroup

end

class Radgroup < ActiveRecord::Base
  self.table_name = 'radgroup'

  has_many :radusergroup, :dependent => :destroy
  has_many :radcheck, :through => :radusergroup

end


class Radusergroup < ActiveRecord::Base

belongs_to :radcheck
belongs_to :radgroup

end

def new
  @radcheck = Radcheck.new
  ...
 end

 def create
  @radcheck = Radcheck.new(params[:radcheck])
  ...
 end

+----------------+-----------------------+----------+------+
 | radcheck_id    | radgroup_id           | priority | id   |
 +----------------+-----------------------+----------+------+
 | 8              | 3                     |        1 |    1 |
 | 4              | 9                     |        0 |    2 |
 | 22             | 4                     |        1 |    3 |
 | 2              | 6                     |        1 |    4 |

+----------------+-----------------------+----------+------+
| ...username    | --groupname           | priority | id   |
+----------------+-----------------------+----------+------+
| user123344     | group88888            |        1 |    1 |
| shushQb        | 30-minutes            |        0 |    2 |
| forty          | gigiig                |        1 |    3 |
| snang          | ps-staff              |        1 |    4 |

def radgroup_ids
  radgroups.map(&:id)
end

@radcheck.radgroups.include?(group)