nested forms - Rails 4.2 saving has_and_belongs_to_many association Ids -

i have following bit of code working fine rails 4.1 protected_attributes gem (i didn't have code moved strong_parameters yet)

models/employee.rb

class employee     has_and_belongs_to_many :skills     attr_accessible :skill_ids, ...  end 

models/skill.rb

class skill   has_and_belongs_to_many :employees end 

i bind skills employee while updating employee view looks below

views/employees/_form.html.erb

 <%= form_for @employee,  |f| %> .....    <%= f.collection_select :skill_ids, skill.all, :id, :name, {},      {:multiple => true, class: 'select2 '} %> ...... <% end %> 

skill_ids part of attr_accessible params worked while saving employee form. (note: doesn't require accepts_nested_attributes_for :skills set @ employee model)

rails 4.2

i in process of migrating code rails 4.2 , moving strong parameters.

i've white-listed skill_ids in employees controller , invoking on update action, :

controllers/employee_controller.rb

def update   @employee = employee.find(params[:id])   @employee.update_attributes(employee_params) end  private  def employee_params   params.require(:employee).permit(:skill_ids, .....) end 

but wouldn't update skill ids employees.

can please point me has changed in rails 4.2 saving association values these?

thanks.

the issue how whitelisted param. should whitelisted array param so:

 params.require(:employee).permit({:skill_ids => []}, .....)