use of halper form_for

[authera]

I'm confused... using a helper. form_for:

<%= form_for @foods do |f| %>
<% end %>

in contrast @foods Like:

def index
  @foods = Food.all
end

migration is defined as:

create_table "foods", force: :cascade do |t|
t.string   "name"
t.datetime "created_at", null: false
t.datetime "updated_at", null: false
end

The model is defined as:

class Food < ActiveRecord::Base
end

so the tracks (gem 'rails', '4.2.6') on the shirts ( ruby 2.3.0p0 (2015-12-25 revision 53290) [x86_64-linux] ) are issued:

undefined method `to_key' for "#Food: ActiveRecord_Relation:0x00002af6f98" Did you mean? to_query to_ary

What's wrong?

[inna]

If the shape is emitted in the route of the appropriate method indexthe mistake is that instead of creating one new model

@food = Food.new

or search for an existing record

@food = Food.find(params[:id])

You extract all the records that match the models. Food

@foods = Food.all

You're not making an object. FoodThe one that's waiting forchopper. from_fora collection ActiveRecord::Relationwhich cannot be processed. ♪ from_for Only one object should be transferred.