我的动作管理器有这个方法。但是在mail(to: @reservation.restaurant.user.email, subject: "Reservation Notification for #{@reservation.restaurant.res_name}")行上我得到了一个未定义的方法（NoMethodError）。我真的不明白这里的链接。任何人都可以帮助我吗？
class ReservationMailer < ActionMailer::Base
default from: 'kgan@kgapplications.com'
def reservation_notification(reservation)
@reservation = reservation
mail(to: @reservation.restaurant.user.email, subject: "Reservation Notification for #{@reservation.restaurant.res_name}")
end
def reservation_edit(reservation)
@reservation = reservation
mail(to: @reservation.user.email, subject: "Reservation has been changed for #{@reservation.restaurant.res_name}")
end
end
class ReservationsController < ApplicationController
def index
@reservation = Reservation.all
end
def show
@reservation = Reservation.find(params[:id])
end
def new
@restaurant = Restaurant.find(params[:restaurant_id])
@reservation = @restaurant.reservations.build
end
def create
if user_signed_in?
@restaurant = Restaurant.find(params[:restaurant_id])
@reservation = @restaurant.reservations.build(reservation_params)
if @reservation.save
ReservationMailer.reservation_notification(@reservation).deliver
redirect_to restaurant_reservation_path(@reservation.restaurant_id, @reservation.reservation_id)
else
render 'new'
end
else
redirect_to new_owner_session_path
end
end
def edit
@reservation = Reservation.find(params[:id])
end
def update
@reservation = Reservation.find(params[:id])
if @reservation.update_attributes(reservation_params)
flash.now[:notice] = "You have successfully updated #{@reservation.reservation_id.titleize}."
redirect_to @reservation
else
render 'edit'
end
end
def destroy
@reservation = Reservation.find(params[:id])
@reservation.destroy
flash.now[:notice] = "#{@reservation.reservation_id.titleize} has been deleted!"
redirect_to reservations_url
end
private
def reservation_params
params.require(:reservation).permit(:name, :email, :requested_date_time, :message).merge(user_id: current_user.id)
end
end
class Reservation < ActiveRecord::Base
belongs_to :restaurants
validates :name, :email, :requested_date_time, presence: true
end
class Restaurant < ActiveRecord::Base
before_save :set_address
belongs_to :users
has_many :reservations
has_many :pictures, as: :imageable
accepts_nested_attributes_for :pictures, allow_destroy: true
validates :res_name, :res_description, :address_street1, :address_city, :address_state, :address_zipcode, :address_country, presence: true
def set_contact_info
"Phone: #{self[:number_phone]} Fax: #{self[:number_fax]} Email: #{self[:email]}".squish
end
def set_address
address.squish
end
private
def address
"#{self[:address_street1]} #{self[:address_street2]} #{self[:address_city]} #{self[:address_state]} #{self[:address_zipcode]} #{self[:address_country]}"
end
end
Started GET "/restaurants/3/reservations/new" for 127.0.0.1 at 2014-07-21 02:51:48 -0500
Processing by ReservationsController#new as HTML
Parameters: {"restaurant_id"=>"3"}
Restaurant Load (0.3ms) SELECT "restaurants".* FROM "restaurants" WHERE "restaurants"."restaurant_id" = $1 LIMIT 1 [["restaurant_id", 3]]
Rendered shared/_error_messages.html.erb (0.0ms)
Rendered reservations/_form.html.erb (5.6ms)
Rendered reservations/new.html.erb within layouts/application (6.3ms)
User Load (0.6ms) SELECT "users".* FROM "users" WHERE "users"."id" = 8 ORDER BY "users"."id" ASC LIMIT 1
Completed 200 OK in 29ms (Views: 11.7ms | ActiveRecord: 3.9ms)
Started POST "/restaurants/4/reservations" for 127.0.0.1 at 2014-07-21 07:06:49 -0500
Processing by ReservationsController#create as HTML
Parameters: {"utf8"=>"✓", "authenticity_token"=>"3XKqwdNcRSTveqJ9n6ggiMQGwLWkoe0Jemx1+oGZvjw=", "reservation"=>{"name"=>"test", "email"=>"test@test.com", "requested_date_time(1i)"=>"2014", "requested_date_time(2i)"=>"7", "requested_date_time(3i)"=>"21", "requested_date_time(4i)"=>"07", "requested_date_time(5i)"=>"00", "message"=>"etetetetete"}, "commit"=>"Submit", "restaurant_id"=>"4"}
User Load (0.5ms) SELECT "users".* FROM "users" WHERE "users"."id" = 7 ORDER BY "users"."id" ASC LIMIT 1
Restaurant Load (0.2ms) SELECT "restaurants".* FROM "restaurants" WHERE "restaurants"."restaurant_id" = $1 LIMIT 1 [["restaurant_id", 4]]
(0.1ms) BEGIN
SQL (0.3ms) INSERT INTO "reservations" ("created_at", "email", "message", "name", "requested_date_time", "restaurant_id", "updated_at", "user_id") VALUES ($1, $2, $3, $4, $5, $6, $7, $8) RETURNING "reservation_id" [["created_at", "2014-07-21 12:06:49.727918"], ["email", "test@test.com"], ["message", "etetetetete"], ["name", "test"], ["requested_date_time", "2014-07-21 07:00:00.000000"], ["restaurant_id", 4], ["updated_at", "2014-07-21 12:06:49.727918"], ["user_id", 7]]
(6.4ms) COMMIT
ReservationMailer#reservation_notification: processed outbound mail in 0.6ms
Completed 500 Internal Server Error in 18ms
NoMethodError - undefined method `restaurant' for #<Reservation:0x007ffeb0fb8360>:
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activerecord (4.1.4) lib/active_record/attribute_methods.rb:208:in `method_missing'
app/mailers/reservation_mailer.rb:7:in `reservation_notification'
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actionmailer (4.1.4) lib/action_mailer/base.rb:551:in `new'
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app/controllers/reservations_controller.rb:21:in `create'
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/home/kareem/.rbenv/versions/2.1.2/lib/ruby/2.1.0/webrick/httpserver.rb:138:in `service'
/home/kareem/.rbenv/versions/2.1.2/lib/ruby/2.1.0/webrick/httpserver.rb:94:in `run'
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Started POST "/__better_errors/70365933492240/variables" for 127.0.0.1 at 2014-07-21 07:06:49 -0500
答案 0 :(得分：1)
尝试改变：
class Reservation < ActiveRecord::Base
belongs_to :restaurants
end
到
class Reservation < ActiveRecord::Base
belongs_to :restaurant
end