https://github.com/tylerrick/active_record_auto_build_associations

Automatically calls `build_assoc_model` for you, ensuring that model.assoc_model is always an instance of model and not nil.
https://github.com/tylerrick/active_record_auto_build_associations

Last synced: 26 days ago
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Automatically calls `build_assoc_model` for you, ensuring that model.assoc_model is always an instance of model and not nil.

• Host: GitHub
• URL: https://github.com/tylerrick/active_record_auto_build_associations
• Owner: TylerRick
• Created: 2011-08-08T00:48:49.000Z (almost 15 years ago)
• Default Branch: master
• Last Pushed: 2012-11-29T22:59:22.000Z (over 13 years ago)
• Last Synced: 2026-02-15T06:15:42.136Z (4 months ago)
• Language: Ruby
• Homepage:
• Size: 102 KB
• Stars: 3
• Watchers: 0
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: Readme.md

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README

          
ActiveRecord::AutoBuildAssociations

===================================

Now you never have to remember to manually call `build_address` or `comments.build` again.

Now you never have to worry about `NoMethodErrors` when you call `user.address.country`.

If you have an associated that should always be there when you need it, whether as a record that is already saved or (if it hasn't been saved yet), a newly built object, you can just add this to your model:

    class User < ActiveRecord::Base

      include ActiveRecord::AutoBuildAssociations

      auto_build_association :address

    end

This makes it so that any time you do `user.address`, if an existing associated record can't be found, it will automatically call `build_address` for you, ensuring that user.address will always be an instance of `Address` (even if a blank one), instead of sometimes being `nil`.

This can be very convenient for building forms for records with associations (using fields_for).

Note: You can't just check `user.address.nil?` to check if the user has supplied an address, because

`user.address` will *never* be nill when using `auto_build_association`. Instead you can check

`user.address.persisted?`.

Compatibility

=============

Tested with Rails 3.2.

To do

=====

* Currently it only works for has_one -- make it work for has_many and belongs_to (belongs_to kind of works but not well)

* Add tests

*Warning*: `belongs_to` doesn't work well because the parent record will try to auto-save the associated record

even if it's blank. In other words, simply checking if the associated record is presented/persisted has unwanted

**side effects**. So if you call `user.address.persisted?`, that causes the associated address to be

built, which may cause unexpected behavior/failure when you try to change the user.

License

=======

Copyright 2011-2012, Tyler Rick

This is free software, distributed under the terms of the MIT License.