Konnte nicht finden Welt mit 'ID' =

Question

Ich habe ein World Elternobjekt und ein Kind State-Objekt. Ich versuche, ein neues State-Objekt zu erstellen, und rails findet die ID der Welt nicht. Ich versuche, von der Weltshow-Seite auf das neue Statusformular zu verlinken, und die URL zeigt .../worlds/1/states/new, also warum greift das nicht auf die Eltern-ID zu? Der Fehler stammt angeblich von dieser Leitung in der Steuerung @world = World.find(params[:id]). Ich habe versucht, (params[:world_id]) sogar zu verwenden.

Der Kürze halber schreibe ich nur den relevanten Code hier.

world.rb

class World < ApplicationRecord 
    belongs_to :user 
    has_many :states 
end 

state.rb

class State < ApplicationRecord 
    belongs_to :world 
    belongs_to :user 
end 

states_controller.rb

class StatesController < ApplicationController 
    before_action :set_state, only: [:show, :edit, :update, :destroy] 
    before_action :authenticate_user!, except: [:index, :show] 

    def index 
    @states = State.all 
    end 

    def new 
    @world = World.find(params[:id]) 
    @state = @world.states.build 
    end 

    def create 
    @world = World.find(params[:id]) 
    @state = @world.states.build(state_params) 
    @state.user = current_user 

    respond_to do |format| 
     if @state.save 
     format.html { redirect_to @state, notice: 'State was successfully created.' } 
     else 
     format.html { render :new } 
     end 
    end 
    end 

    private 
    def set_state 
     @state = State.find(params[:id]) 
    end 

    def state_params 
     params.require(:state).permit(:name, :summary, :history, :population, :inception, :life_expectancy, :land_mass, 
            :climate, :industry, :education, :mythology, :law, :culture, :world_id, :user_id) 
    end 
end 

Der Link zum neuen Staatsform in Welten/show.html.erb:

<%= link_to 'New State', new_world_state_path(@world) %> 

routes.rb

Rails.application.routes.draw do 
    resources :states 
    resources :worlds 
    devise_for :users, path: '', path_names: { sign_in: 'login', sign_out: 'logout', sign_up: 'register' } 
    root to: "home#index" 

    resources :users 
    resources :worlds do 
    resources :states 
    end 
end 

Staaten/_form.html.erb

<div class="form"> 
    <%= form_for(state) do |f| %> 
    <% if state.errors.any? %> 
     <div id="error_explanation"> 
     <h2><%= pluralize(world.errors.count, "error") %> prohibited this state from being saved:</h2> 

     <ul> 
     <% state.errors.full_messages.each do |message| %> 
      <li><%= message %></li> 
     <% end %> 
     </ul> 
     </div> 
    <% end %> 

    <%= f.text_field :name, placeholder: 'Name' %><br /> 

    <fieldset> 
     <legend>Basic Info</legend> 
     <%= f.text_area :summary, placeholder: 'Summary About', rows: 6 %><br /> 
     <%= f.text_area :history, placeholder: 'History', rows: 6 %><br /> 
     <%= f.text_area :climate, placeholder: 'Climate', rows: 3 %><br /> 
     <%= f.text_area :industry, placeholder: 'Industry', rows: 3 %><br /> 
     <%= f.text_area :education, placeholder: 'Education', rows: 3 %><br /> 
     <%= f.text_area :culture, placeholder: 'Culture', rows: 3 %><br /> 
     <%= f.text_area :law, placeholder: 'Legal System, Crime & Punishment', rows: 3 %><br /> 
     <%= f.text_area :mythology, placeholder: 'Mythology', rows: 3 %><br /> 
    </fieldset> 

    <fieldset> 
     <legend>Quick Stats</legend> 
     <%= f.text_field :inception, placeholder: 'Inception' %><br /> 
     <%= f.text_field :population, placeholder: 'Population' %><br /> 
     <%= f.text_field :life_expectancy, placeholder: 'Ave. Life Expectance' %><br /> 
     <%= f.text_field :land_mass, placeholder: 'Land Mass' %><br /> 
    </fieldset> 

    <p><%= f.submit %></p> 
    <% end %> 
</div> 

Ergebnisse Schienen Konsole, wenn Link 'New State' klicken

Started GET "/worlds/1/states/new" for 70.196.17.76 at 2017-05-22 13:43:47 +0000 
Cannot render console from 70.196.17.76! Allowed networks: 127.0.0.1, ::1, 127.0.0.0/127.255.255.255 
Processing by StatesController#new as HTML 
    Parameters: {"world_id"=>"1"} 
    User Load (0.3ms) SELECT "users".* FROM "users" WHERE "users"."id" = ? ORDER BY "users"."id" ASC LIMIT ? [["id", 2], ["LIMIT", 1]] 
    World Load (0.1ms) SELECT "worlds".* FROM "worlds" WHERE "worlds"."id" = ? LIMIT ? [["id", nil], ["LIMIT", 1]] 
Completed 404 Not Found in 3ms (ActiveRecord: 0.4ms) 



ActiveRecord::RecordNotFound (Couldn't find World with 'id'=): 

app/controllers/states_controller.rb:13:in `new' 
    Rendering /usr/local/rvm/gems/ruby-2.3.0/gems/actionpack-5.0.3/lib/action_dispatch/middleware/templates/rescues/diagnostics.html.erb within rescues/layout 
    Rendering /usr/local/rvm/gems/ruby-2.3.0/gems/actionpack-5.0.3/lib/action_dispatch/middleware/templates/rescues/_source.html.erb 
    Rendered /usr/local/rvm/gems/ruby-2.3.0/gems/actionpack-5.0.3/lib/action_dispatch/middleware/templates/rescues/_source.html.erb (4.7ms) 
    Rendering /usr/local/rvm/gems/ruby-2.3.0/gems/actionpack-5.0.3/lib/action_dispatch/middleware/templates/rescues/_trace.html.erb 
    Rendered /usr/local/rvm/gems/ruby-2.3.0/gems/actionpack-5.0.3/lib/action_dispatch/middleware/templates/rescues/_trace.html.erb (2.6ms) 
    Rendering /usr/local/rvm/gems/ruby-2.3.0/gems/actionpack-5.0.3/lib/action_dispatch/middleware/templates/rescues/_request_and_response.html.erb 
    Rendered /usr/local/rvm/gems/ruby-2.3.0/gems/actionpack-5.0.3/lib/action_dispatch/middleware/templates/rescues/_request_and_response.html.erb (1.1ms) 
    Rendered /usr/local/rvm/gems/ruby-2.3.0/gems/actionpack-5.0.3/lib/action_dispatch/middleware/templates/rescues/diagnostics.html.erb within rescues/layout (36.6ms) 

Answer 1

Ändern Sie bitte Ihre link_to Helfer angeben und sagen Sie Rails, was der Parameter ist, den Sie senden:

Von:

<%= link_to 'New State', new_world_state_path(@world) %> 

An:

<%= link_to 'New State', new_world_state_path(id: @world) %> 

id, weil Sie die World durch :id als param zu finden versuchen.

auch versuchen, die param ändern, die innerhalb der Steuerung empfangen hat wird, wo Sie die @world Variable sind Einstellung:

def new 
    @world = World.find(params[:world_id]) 
    ... 
end 

Im show.html.erb:

<%= link_to 'New World', new_world_state_path(world_id: @world) %> 

aktualisieren: Was wir gemacht:

In der app/views/worlds/show.html.erb zu ändern e die Art und Weise der param gefassten wurde:

Von:

<%= link_to 'New Nation', new_world_state_path(world_id: @world_id) %> # @world_id wasn't defined 

An:

<%= link_to 'New Nation', new_world_state_path(world_id: @world.id) %> 

Im /app/views/states/_form.html.erb die world_id als hidden_field hinzuzufügen:

<%= f.hidden_field :world_id, value: @world.id %> 

Und dann in app/controllers/states_controller.rb die w zu ändern ay die params empfangen wurden:

def new 
    @world = World.find(params[:world_id]) 
    @state = @world.states.build 
end 

def create 
    @world = World.find(params[:state][:world_id]) 
    ... 

Answer 2

Die world_id während es an die weitergegeben wird: neue Aktion, kann es nicht wieder auf dem Formular an die erstellen Aktion übergeben werden.

Ihr state_params erwartet a: world_id wird zurückgesendet, fügen Sie also ein verstecktes Feld hinzu, um es zurück auf das Formular zu senden.

new.html.erb

<%= f.hidden_field :world_id, :value => @world.id %> 

und die Aktion schaffen aktualisieren, um

@world = World.find(params[:world_id])