Rich text area validation

I’ve got a rich text area on a form, and I’ve added a simple validation that validates_presence_of :content

but when the form fails the submission, it doesn’t display content can’t be blank (it displays that for the regular fields).

How would I get this error message to display? It does say, please fix the following error…

What about this:

class Post  < ApplicationRecord
...
  # for validation only
  attr_accessor :content

  # action text
  has_rich_text :content
...
  validate :post_content_present

  def post_content_present
    errors.add(:content, "can't be empty") if message.blank?
  end
...
end

It’s validate (without s). I’m using this with simple_form, it should work with plain forms too.

ok, it does work but it just says ‘Please review the problems below:’ but it’s missing ‘content can’t be blank.’ (that’s part of the error message that works for the regular text boxes).

I guess that rich text field isn’t wrapped to display error messages?

What is shown in the error message depends depends - simply spoken - on your code. How do you show errors in your form?

Plain rails 7.0 generator provides something like this (my model here is Person):

<%= form_with(model: person) do |form| %>
  <% if person.errors.any? %>
    <div style="color: red">
      <h2><%= pluralize(person.errors.count, "error") %> prohibited this person from being saved:</h2>
      <ul>
        <% person.errors.each do |error| %>
          <li><%= error.full_message %></li>
        <% end %>
      </ul>
    </div>
  <% end %>

It iterates over person.errors and shows each single error separate. SimpleForm generates the following code:

 <%= form.error_notification %>
 <%= form.error_notification message: form.object.errors[:base].to_sentence if form.object.errors[:base].present? %>

so only errors[:base] is shown, not the errors for each attribute. With a working initializer for simple form it shows the errors for a single attribute below the input field and set the failing input field in red.

Without knowing your error display code, which may be different from those above, you can also put the error message in errors[:base]:

def post_content_present
    errors.add(:base, "content can't be empty") if content.blank?
end

The example above has an error, please replace message.blank? with content.blank? (sorry, I#m not able to edit it).

Just for reference: with rails 7.0 it is not neccessary to do something fancy for validations on rich_text. Just standard validations works well:

class Post < ApplicationRecord
  has_rich_text :content
  
  validates_presence_of :content
  ...
end

I mixed up the form error display: blue is rails standard style from the generator, all in red is from the SimpleForm template generator. Both works fine.

Source code: https://github.com/swobspace/rails-playground

1 Like

I’ve got this with Wolfgang’s solution.

def post_content_present errors.add(:base, “content can’t be empty”) if content.blank? end

unfortunately still on Rails 6.1.4.4

you can use active_storage_validations gem

Thanks for sharing this information. It was useful.