Ruby on Rails Wie kann ich eine Validierungsfehlermeldung anzeigen?

Question

Mein Code funktioniert, aber es wird keine Fehlermeldung angezeigt. Ich muss anzeigen, dass das Erstellen einer neuen Reservierung nicht gültig ist, da die Tabellennummer, die @ requested_time und das Datum bereits gebucht wurden.

reservations_controller.rb

def create 
    if !current_user.try(:admin?) 
    @user = User.find(params[:user_id]) 
    @reservation = current_user.reservations.build(reservations_params) 
    @reservation.user = @user 
    @reservation.save 
    redirect_to @user 
    else 
    @user = User.find(params[:user_id]) 
    @reservation = current_user.reservations.build(reservations_params) 
    @reservation.user = @user 
    @reservation.save 
    redirect_to "/lists/reservationlist" 
    end 
end 

reservation.rb

class Reservation < ActiveRecord::Base 

    belongs_to :user 
    belongs_to :customer 
    belongs_to :table 
    belongs_to :payment 

    validates :table_id, uniqueness: { :scope => [:requested_date, :requested_time], :message => "Reservation is not available" } 
end 

new.html.erb

<br> 
<%= form_for [@user, @reservation] do |f| %> 
    <% if current_user.try(:admin?) %> 
    <label>Client Name:</label><p &nbsp;></p> 
    <span class="login"> 
     <%= f.text_field :client_name %><br> 
    </span> 
    <label>Client Address:</label><p &nbsp;></p> 
    <span class="login"> 
     <%= f.text_field :client_address %><br> 
    </span> 
    <label>Client Contact:</label><p &nbsp;></p> 
    <span class="login"> 
     <%= f.text_field :client_contact %><br><br> 
    </span> 
    <% end %> 

    <label>Table Number:</label><p &nbsp;></p> 
    <span class="table"> 
    <%= f.select(:table_id, options_for_select(Table.all.map{ |g| [g.table_number, g.id] }), {:class => "styled-select"}) %><br> 
    </span> 

    <br><label>Number of Guest:</label><p &nbsp;></p> 
    <span class="table"> 
    <%= f.select(:guest_size, options_for_select(1..6), {:class => "styled-select"}) %><p &nbsp;><br> 
    </span> 

    <label>Reservation date </label><p &nbsp;>  
    <div> 
    <span class="datetime"> 
     <%= f.date_select :requested_date, order: [:month, :day, :year],:class => "styled-select"%><br><br> 
    </span> 
    </div> 

    <label>Reservation Time</label><p &nbsp;>   
    <div> 
    <span class="datetime"> 
     <%= f.time_select :requested_time, ampm: true , minute_step: 30, start_hour: 8, end_hour: 22, :class => "styled-select" %> 
    </span> 
    </div><br><br> <!-- ,{ampm: true} --> 

    <label>Reservation fee:</label><p &nbsp;></p> 
    <div> 
    <span class="datetime"> 
    <%= f.select :payment_id, Payment.all.map{ |j| [j.pay_reservation, j.id] }, :class => "styled-select"%><br><br> 
    </span> 
    </div> 
    <div class="field"> 
    <br><div class="actions"><%= f.submit "Confirm Reservation", class: "btn-style" %></div><br> 
    </div> 
<% end %> 

Answer 1

Try adding these lines 

def create 
    if !current_user.try(:admin?) 
    @user = User.find(params[:user_id]) 
    @reservation = current_user.reservations.build(reservations_params) 
    @reservation.user = @user 
    **if @reservation.valid? 
     @reservation.save 
     redirect_to @user 
    else 
     # code to redirect to same page 
    end** 
    else 
      @user = User.find(params[:user_id]) 
      @reservation = current_user.reservations.build(reservations_params) 
      @reservation.user = @user 
      @reservation.save 
      redirect_to "/lists/reservationlist" 
    end 
end 

Answer 2

Es gibt viele Überschneidungen in Ihrem Controller und Sie überprüfe nicht ob es wa ist s einen Fehler, während der Aufzeichnung zu speichern:

<% if @reservation.errors.any? %> 
    <ul> 
    <% @reservation.errors.full_messages.each do |msg| %> 
     <li><%= msg %></li> 
    <% end %> 
    </ul> 
<% end %> 

:

def create 
    @reservation = current_user.reservations.build(
    reservations_params.merge(user: User.find(params[:user_id])) 
) 

    if @reservation.save 
    redirect_to current_user.admin? ? '/lists/reservationlist' : @user 
    else 
    render :edit # re-render the edit form if there was an error 
    end 
end 

Und in Ihrer edit Ansicht, die Sie so etwas wie hinzufügen müssen