ruby on rails - Update an existing model (User) in a nested form for a new model (Project) -

using rails 4.2.3

i want create form update model (user) , create new ones (project, rewards, bankaccount)

my models:

class user < activerecord::base   has_many :projects   def self.permitted_params     [:id, :last_name, ... , bank_account_attributes: bankaccount.permitted_params]   end     ... end  class project < activerecord::base   belongs_to :user   accepts_nested_attributes_for :user    def self.permitted_params     [:name, :description, ...]   end     ... end 

form:

<%= simple_form_for @project, html: { class: 'saveable-form' } |f| %>   <%= f.input :name %>   ...    <%= f.simple_fields_for :user |user| %>       <%= render 'user_fields', f: user %>   <% end %> <% end %> 

controller

class projectscontroller < applicationcontroller   def new     @project = project.new     @project.user = current_user     @project.user.build_bank_account   end  ...    def project_params     params.require(:project).permit(       project.permitted_params,       rewards_attributes: reward.permitted_params,       user_attributes: user.permitted_params     )   end end 

it simple form.

but when try submit got this:

couldn't find user id=1 project id= 

i got temporary fix this, found here

this fix rails 2.3.8. hope there dryer solution this.

suggestions ? have encountered problem , how have fixed ?

here full code:

form: http://pastebin.com/nwfxcjqh

controller: http://pastebin.com/u2g2sv04

models: http://pastebin.com/5qscsxn6

it sounds need use inverse of in class. in rails docs, this article gives pretty explanation.

btw agree @max's comments re permitted parameters belonging in controller. below how whitelist params in controller , include attributes association.

def user_params   params.require(:user).permit(     :id, :last_name, bank_account_attributes: [:id, :account_number, :sort_code]   ) end