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96 lines
2.7 KiB
Text
96 lines
2.7 KiB
Text
= RoleModel
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Ever needed to assign roles to a model, say a User, and build conditional
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behaviour on top of that?
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Assigned roles will be stored as a bitmask in an configurable attribute
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(default: <tt>roles_mask</tt>). Here's how to get started:
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# given a User class with a roles_mask attribute
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require 'rubygems'
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require 'role_model'
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class User
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attr_accessor :roles_mask # in real life this would be an persisted attribute / DB-column
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include RoleModel
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# optionally set the integer attribute to store the roles in,
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# :roles_mask is the default
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roles_attribute :roles_mask
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# declare the valid roles -- do not change the order if you add more
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# roles later, always append them at the end!
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roles :admin, :manager, :author
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end
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#
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# Test drive
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#
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>> u = User.new
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=> #<User ...>
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# role assignment
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>> u.roles = [:admin] # ['admin'] works as well
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=> [:admin]
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# adding roles
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>> u.roles << :manager
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=> [:admin, :manager]
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# quering roles...
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# ... retrieve all assigned roles
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>> u.roles # aliased to role_symbols for DeclarativeAuthorization
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=> [:admin, :manager]
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# ... check for individual roles
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>> u.has_role? :author
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=> false
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>> u.is_a? :admin # has_role? is aliased as is_a?
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=> true
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# see the internal bitmask representation (3 = 0b0011)
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>> u.roles_mask
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=> 3
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Once you have included RoleModel, your model is perfectly fit to be used
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together with a role-based authorization solution, such as
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http://github.com/ryanb/cancan or
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http://github.com/stffn/declarative_authorization .
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== Installation
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gem install role_model
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== Reasoning
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Whenever I introduce a role-based authorization scheme into a project, the
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code gets coupled somehow to the available roles. So it usually does not make
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any sense to have a separate Role model stored within the database. This Role
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model will contain a predefined set of roles anyhow -- changing that set will
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need to be reflected within the authorization code. Putting the available
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roles right into the model that actually uses them, makes things much easier
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and efficient.
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== Note on Patches/Pull Requests
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* Fork the project.
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* Make your feature addition or bug fix.
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* Add tests for it. This is important so I don't break it in a
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future version unintentionally.
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* Commit, do not mess with Rakefile, version, or history.
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(if you want to have your own version, that is fine but bump version in a
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commit by itself I can ignore when I pull)
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* Send me a pull request. Bonus points for topic branches.
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== Credits
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RoleModel is an implementation of the Role Based Authorization scheme
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proposed by Ryan Bates
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(http://wiki.github.com/ryanb/cancan/role-based-authorization).
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== Copyright
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Copyright (c) 2010 Martin Rehfeld. See LICENSE for details.
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