I am working on a pretty simple web application (famous last words) and am working with Rails 2.3.5 + MongoMapper 0.7.2 and using embedded documents. I have two questions to ask:
First, are there any example applications out there using Rails + MongoMapper + EmbeddedDocument? Preferably on GitHub or some other similar site so that I can take a look at the source and see where I am supposed to head? If not ...
... what is the best way to approach this task? How would I go about creating a form to handle an embedded document.
What I am attempting to do is add addresses to users. I can toss up the two models in question if you would like.
Thanks for the help!
Here's the basic approach I took in one of my apps. Problem has many answers - problem is a document, answer is an embedded document. You can use the "add answer" link to generate another answer field, and the "remove" link to delete one.
_form.html.erb:
<% form_for @problem do |f| %>
<%= f.error_messages %>
<p>
<%= f.label :content %><br />
<%= f.text_area :content, :size => '50x7' %>
</p>
...etc...
<%= add_answer_link "(add answer)" %>
<div id="answers">
<%= render :partial => 'answer', :collection => @problem.answers %>
</div>
<p><%= f.submit "Submit" %></p>
<% end %>
_answer.html.erb:
<div class="answer">
<% fields_for 'problem[answers]', answer, :index => nil do |f| -%>
<%= f.label :content, "Answer #{answer.id}:" %>
<%= f.text_field :content, :size => 50 %>
<%= link_to_function "(remove)", "$(this).up('.answer').remove()" %>
<% end -%>
</div>
problems_helper.rb
module ProblemsHelper
def add_answer_link(name)
link_to_function name do |page|
page.insert_html :bottom, "answers", :partial => 'answer', :object => Answer.new
end
end
end
I cut out a couple minor bits of the implementation, but that should work.
Even easier now -- update for Rails 4.1.1, ruby 2.1.1p76:
Models:
class Location
include MongoMapper::EmbeddedDocument
key :state, String, :default => "CA"
key :zip, String
timestamps!
end
class House
include MongoMapper::Document
timestamps!
one :location
end
Controller:
def new
@house = House.new
end
new.html.erb:
<%= form_for @house, url: houses_path do |house_form| %>
<p>
<%= house_form.label :name %><br>
<%= house_form.text_field :name %>
</p>
<%= house_form.fields_for :location do |address_fields| %>
Street : <%= address_fields.text_field :street %>
Zip code: <%= address_fields.text_field :zip %>
<% end %>
<p>
<%= house_form.submit %>
</p>
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