FDotErrors

Add f.errors(:method) to Rails view.

Rails 4.2.x

Add this line to your application's Gemfile:

gem 'f_dot_errors'

And then execute:

$ bundle

Or install it yourself as:

$ gem install f_dot_errors

# app/models/post.rb
# sure we support ActiveRecord model
class Post < Struct.new(:author_name, :body, :updated_at)
  include ActiveModel::Model
end


# app/controllers/posts_controller.rb
class PostsController < ApplicationController
  def create
    @post = Post.new(post_params)
    if @post.save
      respond_to do |format|
        format.html { redirect_to posts_path }
      end
    else
      respond_to do |format|
        format.html { render :new }
      end
    end
  end
end

# app/views/posts/new.html.erb
<%= form_for(@post) do |f| %>
  <%= f.text_field(:author_name) %>
  <%= f.errors(:author_name) %>

  <%= f.text_field(:body) %>
  <%= f.errors(:body) %>
<% end %>

If @post has errors about :author_name, f.errors render errors:

<form class="new_post" id="new_post" action="/posts" accept-charset="UTF-8" method="post"><input name="utf8" type="hidden" value="&#x2713;" />
  <input type="text" value="" name="post[author_name]" id="post_author_name" />
  <div class="field_with_errors">Author name can't be empty</div>
  <input type="text" value="" name="post[boyd]" id="post_boyd" />
</form>

By default, these proc is used:

Proc.new { |instance, method, template|
  msgs = instance.errors.full_messages_for(method).join("\n")
  "<div class=\"field_with_errors\">#{msgs}</div>".html_safe
}

If you would use a different proc, you can configure in your initializer.

FDotErrors.configure do |c|
  c.field_error_proc = Proc.new { |instance, method, template|

    lis = instance.errors.full_messages_for(method).map do |msg|
      template.content_tag(:li, msg, {class: "field_with_errors_list_item"}, false)
    end.join("\n").html_safe
    template.content_tag(:ul, lis, class: "field_with_errors_list")
  }
end

After checking out the repo, run bin/setup to install dependencies. Then, run rake rspec to run the tests. You can also run bin/console for an interactive prompt that will allow you to experiment.

To install this gem onto your local machine, run bundle exec rake install. To release a new version, update the version number in version.rb, and then run bundle exec rake release, which will create a git tag for the version, push git commits and tags, and push the .gem file to rubygems.org.

Bug reports and pull requests are welcome on GitHub at https://github.com/yui-knk/f_dot_errors. This project is intended to be a safe, welcoming space for collaboration, and contributors are expected to adhere to the Contributor Covenant code of conduct.

The gem is available as open source under the terms of the MIT License.