ruby on rails - How to find nested attribute ID? -


how can show :user_id of dueler in edit page?

edit.html.erb

<%= simple_form_for(@duel) |f| %>   <%= @dueler.user_id %> <% end %>

rails c

duel.last  id: 11,  consequence: "bad",  reward: "good",  dueler.find(15)  id: 15,  user_id: 78, # want id  challenge_id: 179,  duel_id: 11,  dueler.last  id: 16,  user_id: 15,  challenge_id: 190,  duel_id: 11,

duels_controller

@dueler = dueler.find(params[:user_id]) # gives error: activerecord::recordnotfound in duelscontroller#edit couldn't find dueler 'id'=

by request

full duels_controller

class duelscontroller < applicationcontroller   before_action :set_duel, only: [:show, :edit, :update, :destroy]    respond_to :html    def index     @duels = duel.joins(:duelers).all     respond_with(@duels)   end    def show     respond_with(@duel)   end    def new     @duel = duel.new     respond_with(@duel)   end    def edit     @dueler = dueler.find_by(user_id: params[:dueler][:user_id]) # sri vishnu totakura's suggested change   end    def create     @duel = duel.new(duel_params)     @duel.save     respond_with(@duel)   end    def update     @duel.update(duel_params)     respond_with(@duel)   end    def destroy     @duel.destroy     respond_with(@duel)   end    private     def set_duel       @duel = duel.find(params[:id])     end      def duel_params       params.require(:duel).permit(:consequence, :reward, duelers_attributes: [:id, :user_id, :challenge_id, :accept])     end end

since updated question, answer invalid! should have added controller actions initially! suggestion not work problem.

i'm not deleting answer because there discussion in comments.

you need use find_by instead of find.

find queries on id. if need find based on other columns, use find_by

your code should be:

@dueler = dueler.find_by(user_id: params[:dueler][:user_id])

documentation:


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