Rails Collection Select in Form not Saving -

for whatever reason, isn't saving. give me success , redirect page supposed page_id on group item nil.

<%= simple_form_for group |f| %>     <%= f.input :page_id,          collection: @pages,         selected: group.page,         label: false         %>     <%= f.button :submit, "assign page" %> <% end %> 

controller

def update   group = group.find(params[:id])   group.update_attributes(group_params)   redirect_to groups_path, notice: "did it" end 

and params (i have tried every variation on could). odd bit here, form seems creating nested param.

def group_params   params.require(:group).permit(:name, :page, :group => [:page_id]) end 

the returned request params:

{"utf8"=>"✓", "_method"=>"patch", "authenticity_token"=>"cccccii383838=", "group"=>{"page_id"=>"2"}, "commit"=>"assign page", "action"=>"update", "controller"=>"groups", "id"=>"3"} 

a group has_one page. page has_one group. associated ids on each of models.

any thoughts? i'm banging head against wall silly problem.

did try ? think problem group_params method

 def group_params   params.require(:group).permit(:page_id) end