Been playing with merb.
One of the helpers I liked in rails was on form validations. Found
this was real easy to port over, so I thought I'd share.
It doesn't highlight the field with the error, but it gives that same
nice little div on top.
Say I had an articles controller
def create
@article = Article.new(params[:article])
@article.save!
redirect article_path(@article)
rescue
render :action => 'new'
end
I would catch the activerecord exception there with the rescue
Then in global_helper.rb, I add the error_messages_for method. This
is taken from rails and stripped of some of its pieces like
content_tag and pluralize. I'm sure more of it could be cleaned up if
you wanted to.
def error_messages_for(*params)
options = params.last.is_a?(Hash) ? params.pop.symbolize_keys : {}
objects = params.collect {|object_name|
instance_variable_get("@#{object_name}") }.compact
count = objects.inject(0) {|sum, object| sum + object.errors.count }
unless count.zero?
html = {}
[:id, :class].each do |key|
if options.include?(key)
value = options[key]
html[key] = value unless value.blank?
else
html[key] = 'errorExplanation'
end
end
header_message = "Errors prohibited this
#{(options[:object_name] || params.first).to_s.gsub('_', ' ')} from
being saved"
error_messages = objects.map {|object|
object.errors.full_messages.map {|msg| "<li>#{msg}</li>" } }
"<div class=\"errorExplanation\" id=\"errorExplanation\">
<h2>#{header_message}</h2>
<p>There were problems with the following fields:</p>
<ul>
#{error_messages}
</div>"
else
''
end
end
in your _form.herb, you simply call error_messages_for
<%= error_messages_for 'article' %>
<dl>
<dt>Title</dt>
<dd><%= control_for @article, :title, :text %></dd>
<dt>Intro</dt>
<dd><%= control_for @article, :intro, :textarea, :rows => 10, :cols
=> 50 %></dd>
<dt>Body</dt>
<dd><%= control_for @article, :body, :textarea, :rows => 20, :cols =>
50 %></dd>
</dl>
When you try to save something that fails validation, you get your
nice error div.
<div class="errorExplanation" id="errorExplanation">
<h2>Errors prohibited this article from being saved</h2>
<p>There were problems with the following fields:</p>
<ul>
<li>Title can't be blank</li>
</div>
fun.
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