Share Ability Definitions
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Let's say the ability of one action depends on the ability of another. For example, what if we have a
has_many :tasks and we want a task's update ability to be dependent on whether the user can update the project. We can perform the
can? call within the ability definition to check the project permission.
can :update, Task do |task| can?(:update, task.project) end
With this it is easy to define one ability based on another.