How do I fix this form the Rails way? - ruby-on-rails

Question

I want to have all the errors appear on top of their respective areas.
I ran an if statement with any? on the first one but I know I am repeating myself and have to do it the Rails way.
Any help?
<%= form_for #movie, :html => {:class => "form-horizontal"} do |f| %>
<div class="control-group">
<% if #movie.errors[:title].any? %>
<div class="alert alert-error"><%= #movie.errors[:title].to_sentence %></div>
<% end %>
<%= f.label :title, :class => "control-label" %>
<div class="controls">
<%= f.text_field :title %>
</div>
</div>
<div class="control-group">
<div class="alert alert-error"><%= #movie.errors[:description].to_sentence %></div>
<%= f.label :description,:class => "control-label" %>
<div class="controls">
<%= f.text_area :description, :class => "span8", :rows => "10" %>
</div>
</div>
<div class="control-group">
<div class="alert alert-error"><%= #movie.errors[:rating].to_sentence %></div>
<%= f.label :rating, :class => "control-label" %>
<div class="controls">
<%= f.select :rating, Movie::RATINGS, prompt: "Pick one" %>
</div>
</div>
<div class="control-group">
<div class="alert alert-error"><%= #movie.errors[:total_gross].to_sentence %></div>
<%= f.label :total_gross, :class => "control-label" %>
<div class="controls">
<%= f.number_field :total_gross %>
</div>
</div>
<div class="control-group">
<div class="alert alert-error"><%= #movie.errors[:released_on].to_sentence %></div>
<%= f.label :released_on, :class => "control-label" %>
<div class="controls">
<%= f.date_select :released_on, :order => [:month, :day, :year], :prompt => { :month => 'Select month',:day => 'Select day', :year => 'Select year' }, :start_year => 1950 %>
</div>
</div>
<div class="control-group" >
<%= f.label :image_file_name, :class => "control-label" %>
<div class="controls">
<%= f.text_field :image_file_name %>
</div>
</div>
<div class="form-actions">
<%= f.submit :class => "btn btn-success btn-large" %> <%= link_to "Cancel", root_path, class: "btn btn-danger btn-large" %>
</div>
<% end %>

Answer 1

Here's a solution that will be more DRY and won't necessitate gems like simple_form.
Create a partial for your control group and replace the field name and form field helper with variables:
# File: _control_group.html.erb
<% show_errors = true if show_errors.nil? %>
<div class="control-group">
<% if #movie.errors[field_name].present? && show_errors %>
<div class="alert alert-error">
<%= #movie.errors[field_name].to_sentence %>
</div>
<% end %>
<%= label_tag field_name, :class => "control-label" %>
<div class="controls">
field_helper
</div>
</div>
Then replace these items in your form with a partial render and pass the appropriate code in through the parameters:
<%= form_for #movie, :html => {:class => "form-horizontal"} do |f| %>
<%= render "control_group", field_name: :title, field_helper: f.text_field(:title) %>
<%= render "control_group", field_name: :description, field_helper: f.text_area(:description, :class => "span8", :rows => "10") %>
<%= render "control_group", field_name: :rating, field_helper: f.select(:rating, Movie::RATINGS, prompt: "Pick one") %>
<%= render "control_group", field_name: :total_gross, field_helper: f.number_field(:total_gross) %>
<%= render "control_group", field_name: :released_on, field_helper: f.date_select(:released_on, :order => [:month, :day, :year], :prompt => { :month => 'Select month',:day => 'Select day', :year => 'Select year' }, :start_year => 1950) %>
<%= render "control_group", field_name: :image_file_name, field_helper: f.text_field(:image_file_name), show_errors: false %>
<div class="form-actions">
<%= f.submit :class => "btn btn-success btn-large" %> <%= link_to "Cancel", root_path, class: "btn btn-danger btn-large" %>
</div>
<% end %>

Answer 2

Ran into a similar problem.
Using simple_form worked for me. See an example here