CouchRest Model helps you define models that are stored as documents in your CouchDB database.
It supports useful features such as setting properties with typecasting, callbacks, validations, associations, and helps with creating CouchDB views to access your data.
CouchRest Model uses ActiveModel for a lot of the magic, so if you're using Rails, you'll need at least version 3.0. Releases since 2.0.0 are Rails 4.0 compatible, and we recommend Ruby 2.0+.
General API: http://rdoc.info/projects/couchrest/couchrest_model
See the update history for an up to date list of all the changes we've been working on recently.
Upgrading from an earlier version?
Pre 2.2: As of August 2016, dirty tracking has been radically re-factored away from ActiveModel::Dirty, which only has support for basic attributes, into a solution that uses Hashdiff, more details available in the pull request. The result is that some of ActiveModel's Dirty methods are no longer available, these are:
Pre 2.0: As of June 2012, couchrest model no longer supports the
view calls from the model. Views are no only accessed via a design document. If you have older code and wish to upgrade, please ensure you move to the new syntax for using views.
Pre 1.1: As of April 2011 and the release of version 1.1.0, the default model type key is 'type' instead of 'couchrest-type'. Simply updating your project will not work unless you migrate your data or set the configuration option in your initializers:
CouchRest::Model::Base.configure do |config| config.model_type_key = 'couchrest-type' end
$ sudo gem install couchrest_model
If you're using bundler, define a line similar to the following in your project's Gemfile:
CouchRest Model is configured to work out the box with no configuration as long as your CouchDB instance is running on the default port (5984) on localhost. The default name of the database is either the name of your application as provided by the
Rails.application.class.to_s call (with /application removed) or just 'couchrest' if none is available.
The library will try to detect a configuration file at
config/couchdb.yml from the Rails root or
Dir.pwd. Here you can configuration your database connection in a Rails-like way:
development: protocol: 'https' host: sample.cloudant.com port: 443 prefix: project suffix: test username: test password: user
Note that the name of the database is either just the prefix and suffix combined or the prefix plus any text you specify using
use_database method in your models with the suffix on the end.
The example config above for example would use a database called "project_test". Here's an example using the
class Project < CouchRest::Model::Base use_database 'sample' end # The database object would be provided as: Project.database #=> "https://test:firstname.lastname@example.org:443/project_sample_test"
Using instead of ActiveRecord in Rails
A common use case for a new project is to replace ActiveRecord with CouchRest Model, although they should work perfectly well together. If you no longer want to depend on ActiveRecord or any of its sub-dependencies such as sqlite, update your
config/application.rb so the top looks something like:
# We don't need active record, so load everything but: # require 'rails/all' require 'action_controller/railtie' require 'action_mailer/railtie' require 'rails/test_unit/railtie'
You'll then need to make sure any references to
config.active_record are removed from your environment files.
or alternatively below command do the same work
rails new <application-name> --skip-active-record
Now in the gem file just add [couchrest_model] and you are good to go.
$ rails generate couchrest_model:config
$ rails generate model person --orm=couchrest_model
require 'couchrest_model' class Cat < CouchRest::Model::Base property :name, String property :lives, Integer, :default => 9 property :nicknames, [String] timestamps! design do view :by_name end end @cat = Cat.new(:name => 'Felix', :nicknames => ['so cute', 'sweet kitty']) @cat.new? # true @cat.save @cat['name'] # "Felix" @cat.nicknames << 'getoffdamntable' @cat = Cat.new @cat.update_attributes(:name => 'Felix', :random_text => 'feline') @cat.new? # false @cat.random_text # Raises error! # Fetching by views, loading all results into memory cats = Cat.by_name.all cats.first.name # "Felix" # Streaming views, for efficient memory usage Cat.by_name.all do |cat| puts cat.name end
CouchRest Model now comes with a Gemfile to help with development. If you want to make changes to the code, download a copy then run:
That should set everything up for
rake spec to be run correctly. Update the couchrest_model.gemspec if your alterations
use different gems.
The most complete documentation is the spec/ directory. To validate your CouchRest install, from the project root directory run
bundle install to ensure all the development dependencies are available and then
rspec spec or
bundle exec rspec spec.
We will not accept pull requests to the project without sufficient tests.
Please post bugs, suggestions and patches to the bug tracker at http://github.com/couchrest/couchrest_model/issues.
Follow us on Twitter: http://twitter.com/couchrest
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