How to set up error messages of associated model? - ruby-on-rails

Question

Hello rails community!
I have booking_post model that has_many reservations.
class BookingPost < ApplicationRecord
has_many :reservations, dependent: :destroy
end
All reservation belongs_to booking_post and have some validations
class Reservation < ApplicationRecord
belongs_to :booking_post
before_save { self.email = email.downcase }
VALID_EMAIL_REGEX = /\A[\w+\-.]+#[a-z\d\-.]+\.[a-z]+\z/i
validates :email, presence: true, length: { maximum: 255 },
format: { with: VALID_EMAIL_REGEX }
validates :name, :email, :phone_number, :start, :end, presence: true
end
My routes are next:
resources :booking_posts do
resources :reservations, only: [:new, :create]
end
Methods:
class BookingPostsController < ApplicationController
def show
#booking_picture = #booking_post.booking_pictures.build
#booking_pictures = #booking_post.booking_pictures
#reservation = #booking_post.reservations.build
#reservations = #booking_post.reservations
end
end
class ReservationsController < ApplicationController
def new
#reservation = Reservation.new
end
def create
#booking_post = BookingPost.find(params[:booking_post_id])
#email= User.where(admin: true).first.email
#reservation = #booking_post.reservations.build(reservation_params)
if #reservation.save
#saved_reservation = #reservation
redirect_to :back
flash[:notice] = 'Reservation was successfully created.'
ReservationMailer.fresh_message(#saved_reservation, #email).deliver_now
else
redirect_to #booking_post
flash[:info] = #reservation.errors.full_messages do |m|
m
end
end
end
end
I would like to create on booking_posts/show.html.erb form_for #reservation, and render on this page errors for #reservation. When I create valid #reservation, I see on booking_posts/show.html.erb successfull flash message, but unvalid #reservation appear without any error flash messages.
form_for #reservation on booking_posts/show.html.erb:
<div class="card-action">
<%= form_for([#reservation.booking_post, #reservation], html: {multipart: true}, class: "col s12") do |f| %>
<% if #reservation.errors.any? %>
<div id="error_explanation">
<h2><%= pluralize(#reservation.errors.count, "error") %> prohibited this post from being saved:</h2>
<ul>
<% #reservation.errors.full_messages.each do |message| %>
<li><%= message %></li>
<% end %>
</ul>
</div>
<% end %>
<div class="col s6">
<%= f.label :start %>
<%= f.date_field :start, placeholder: "start time", class: "datepicker" %>
</div>
<div class="col s6">
<%= f.label :end %>
<%= f.date_field :end, placeholder: "end time", class: "datepicker" %>
</div>
<div class="col s6">
<%= f.label :reservation_time %>
<%= f.time_field :reservation_time, placeholder: "time", class: "timepicker", id: "timepicker", type: "time" %>
</div>
<div class="input-field col s6">
<%= f.label :name %>
<%= f.text_field :name, class: "validate" %>
</div>
<div class="input-field col s6">
<%= f.label :email %>
<%= f.text_field :email, class: "validate" %>
</div>
<div class="input-field col s6">
<%= f.label :phone_number %>
<%= f.text_field :phone_number, class: "validate" %>
</div>
<div class="waves-effect waves-light btn">
<%= f.submit t(:submit_reservation)%>
</div>
<% end %>
<br>
</div>
I would like render error messages for #reservation on #booking_post page
(in booking_post_path, not in new_reservation_path or anyting else). How can I do so?
Thanks for solutions

Answer 1

In your else block, Please update it like this
flash[:notice] = #reservation.errors.full_messages.to_sentence
redirect_to #booking_post