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== HABTM Example
Complex forms on a HABTM association.
Using code borrowed from Pat (http://patshaughnessy.net), whose view_mapper
finally taught this hobbyist hacker to write forms.
Hopefully this will fit snugly into someone else's gem
== Installation
* Install as a gem:
# Add to your Gemfile
gem "anaf_habtm"
* or as a plugin
rails plugin install git://github.com/tylergannon/anaf_habtm.git
Run the generator to place the javascript in the right place:
rails generate anaf_habtm
Add the following to your layout:
<%= javascript_include_tag 'nested_attributes.js' %>
== Usage
Inside your model, call anaf_habtm just as you would call has_and_belongs_to_many,
except now you need to offer a code block telling rails what to do with each object.
The plugin will handle deleting stuff.
# Basically, your code block needs to return an object of the correct
# type for your association collection, or else nil if your code
# determines that the object should be rejected.
class Customer < ActiveRecord::Base
anaf_habtm :orders, :autosave => true, :uniq => false do |params, order|
order = order ||= Order.new
order.attributes = params
logger.error params.inspect
order
end
end
class Order < ActiveRecord::Base
has_and_belongs_to_many :customers
anaf_habtm :items, :autosave => true, :uniq => false do |params, item|
logger.error "ITEM::: #{params.inspect}"
item ||= Item.find_or_create_by_name(params["name"])
end
end
== Additional info
See the example app at http://github.com/tylergannon/accepts-nested-attributes-habtm-example for more details.
Also check out Pat's view_mapper... it can generate the code you need inside your views.
http://github.com/patshaughnessy/view_mapper
Version data entries
43 entries across 43 versions & 2 rubygems