undefined method `people_index_path'

Question

I'm learning rails and have encountered a problem I can not find a solution to.

When I am using a form for editing and creating new persons, I get this error

undefined method 'people_index_path' for #<#<Class:0x007f68442da790>:0x007f6850013410>

On the following line.

<%= form_for @people do |f| %>

This is what my rake routes look like.

    Prefix Verb   URI Pattern                Controller#Action
       root GET    /                          welcome#index
     events GET    /events(.:format)          events#index
            POST   /events(.:format)          events#create
  new_event GET    /events/new(.:format)      events#new
 edit_event GET    /events/:id/edit(.:format) events#edit
      event GET    /events/:id(.:format)      events#show
            PATCH  /events/:id(.:format)      events#update
            PUT    /events/:id(.:format)      events#update
            DELETE /events/:id(.:format)      events#destroy
     people GET    /people(.:format)          people#index
            POST   /people(.:format)          people#create
 new_person GET    /people/new(.:format)      people#new
edit_person GET    /people/:id/edit(.:format) people#edit
     person GET    /people/:id(.:format)      people#show
            PATCH  /people/:id(.:format)      people#update
            PUT    /people/:id(.:format)      people#update
            DELETE /people/:id(.:format)      people#destroy

And the controller

class PeopleController < ApplicationController
    def new
        @people = People.new
    end

    def edit
        @people = People.find(params[:id])
    end

    def update
        @people = People.find(params[:id])
        if @people.update(people_params)
            redirect_to people_path
        else
            render 'edit'
        end
    end

    def show
        @people = People.find(params[:id])
    end

    def index
        @all_people = People.all
    end

    def create
        @people = People.new(people_params)

        if @people.save
            redirect_to @people
        else
            render 'new'
        end
    end

    def destroy
       @people = People.find(params[:id])
       @people.destroy

       redirect_to people_path
    end

    private
        def people_params
            params.require(:people).permit(:name, :pno, :gender)
        end
end

schema.rb

ActiveRecord::Schema.define(version: 20140417200735) do

  create_table "events", force: true do |t|
    t.string   "title"
    t.string   "location"
    t.datetime "date"
    t.text     "description"
    t.datetime "created_at"
    t.datetime "updated_at"
  end

  create_table "people", force: true do |t|
    t.string   "name"
    t.string   "pno"
    t.string   "gender"
    t.datetime "created_at"
    t.datetime "updated_at"
  end

end

I would appreciate any help to solve this problem.

routes.rb

Nightlife::Application.routes.draw do
  root 'welcome#index'
  resources :events, :people
end

Full error message. I do only get errors while creating a new person.

NoMethodError in People#new
Showing /home/oalsing/Documents/Websites/Rails/Nightlife/app/views/people/_form.html.erb where line #1 raised:

undefined method `people_index_path' for #<#<Class:0x007f68442da790>:0x007f68481c42a8>
Extracted source (around line #1):
1
2
3
4

  <%= form_for @people do |f| %>

      <% if @people.errors.any? %>
          <div id="error_explanation">

Trace of template inclusion: app/views/people/new.html.erb

Rails.root: /home/oalsing/Documents/Websites/Rails/Nightlife

Application Trace | Framework Trace | Full Trace
app/views/people/_form.html.erb:1:in `_app_views_people__form_html_erb__3105468428477628872_70042931049120'
app/views/people/new.html.erb:3:in `_app_views_people_new_html_erb__2301167718720189466_70042999118360'
Request

Parameters:

None

Answer 1

I wonder why everybody here don't point out the problem in model name.

If you have a PeopleController, the model should be Person but NOT People because "people" is plural of "person".

And the instance name should be @person but not @people.

Rails convention is not a must. But please respect it when you can. Only break it when you really have to and know every in and out.

The named path has already bite you. You'll see more for breaking the convention.

Answer 2

As per the comments,you are trying to create a new People record,so change your code to like this

<%= form_for @people, url: {action: "create"} do |f| %>

Answer 3

thats a long standing bug , Check rails issues page

This works in case of edit but wont work on create.

This is what the guides have to say:

A long-standing bug prevents form_for from working automatically with singular resources. As a workaround, specify the URL for the form directly, like so:

form_for @geocoder, url: geocoder_path do |f|

so in your case ,

<%= form_for @people, url: people_path do |f| %>

should work.

Answer 4

Try this when the form is same

<%= form_for @people, :url => (@people.new_record? ? (people_path) : (person_path(@people))), :method => (@people.new_record? ? "post" : "put") do |f| %>