Custom Validation error messages not appearing in view - ruby-on-rails

Question

I have some custom validations in my model for when the user submits a URL using simple_form, but I can't seem to get the error message associated with each custom validation to show in the view (yet the validations seem to work)?
The only error I see is the one defined in the create method. Any guidance would be appreciated....
Model
class Product < ActiveRecord::Base
validates :url, presence: true
validate :check_source, :must_contain_product_id
def check_source
valid_urls = ["foo", "bar"]
errors.add(:url, "Must be from foo or bar") unless valid_urls.any? {|mes| self.url.include? mes}
end
def must_contain_product_id
errors.add(:url, "Must be product page") unless self.url.include? "productID"
end
end
Controller
def create
#product = Product.new
if #product.save
flash[:success] = "Product added to your list"
redirect_to root_path
else
flash[:message] = "Sorry we can't add this product"
redirect_to root_path
end
end
View (using Simple_form)
# Various messaging I've tried
<% if flash[:success].present? %>
<div data-alert class="alert-box success">
<%= flash[:success] %>
</div>
<% end %>
<% if flash[:error].present? %>
<div data-alert class="alert-box">
<%= flash[:error] %>
</div>
<% end %>
<% if flash[:message].present? %>
<div data-alert class="alert-box">
<%= flash[:message] %>
</div>
<% end %>
<% if #product.errors.any? %>
<div id="error_explanation">
<h2><%= pluralize(#product.errors.count, "error") %> prohibited this post from being saved:</h2>
<ul>
<% #product.errors.full_messages.each do |msg| %>
<li><%= msg %></li>
<% end %>
</ul>
</div>
<% end %>
# The actual form...
<%= simple_form_for Product.new do |form| %>
<%= form.input :url, maxlength: false %>
<%= form.button :submit, "Get Product", data: { disable_with: "Retrieving product ..." } %>
<% end %>

Answer 1

I had the same issue solved using:
errors.add(:base, "message here")
However this won't be assigned to a specific form input (e.g url) which was not necessary in my case

Answer 2

You're redirecting to the root_path in the create action regardless of whether or not the save is successful. Your view for the Product form contains divs for the flashes, but unless the view for the root_path renders flash divs as well you won't see them.

Answer 3

I think you neet to redirect to products, or to edit. Otherwise you are unable to see the error, because you are not on the page where it should be displayed.
Try
def create
#product = Product.new
if #product.save
flash[:success] = "Product added to your list"
redirect_to root_path
else
flash[:message] = "Sorry we can't add this product"
render 'edit'
end
end

Answer 4

errors.add(:base, "message")
This is the correct syntax to add message in custom validations.

Answer 5

See your code you are redirecting to root_path if you redirecting means values and variable will not come to your partial.
so you have to change your code like,
def create
#product = Product.new
if #product.save
flash[:success] = "Product added to your list"
redirect_to root_path
else
flash[:message] = "Sorry we can't add this product"
render :action => "new"
end
end
after that in model Instead of
errors.add(:url, "Must be from foo or bar")
Please try like this:
errors[:base] << ("Must be from foo or bar")