How do pass parameters with the `send` function

Question

I'm using cancan in a Rails 3.2 app, and in the abilities.rb classing have a method for each role's abilities

#ability.rb

def initialize(user)
  user_or_admin ||= User.new

  user.roles.each do |role| 
    send(role.name)
  end
end

def role_name_a

end

def role_name_b

end

Some of these methods require access to the user record, how do I pass it with the send function?

e.g. I want to do something like

send(role.name)(user)

and then

def role_name_a(user)

But this doesn't work. Grateful for any ideas.

Logan Serman · Accepted Answer · 2013-02-16 03:56:11Z

2

The arguments are the second parameter to send. The first argument is the method name as a symbol.

send :"#{role.name}", user

You should try looking at Ruby's documentation for questions like this. The language is well documented.

http://ruby-doc.org/core-1.9.3/Object.html#method-i-send

answered Feb 16, 2013 at 3:56

Logan Serman

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1 Comment

Andy Harvey Over a year ago

great, thanks for the reference, I was looking in the wrong place!

CoderHulk · Accepted Answer · 2013-02-16 03:58:32Z

0

I'm not sure if this is best practice but it's what is in the cancan documentation.

def initialize(user)
  @user = user || User.new

  user.roles.each do |role| 
    send(role.name)
  end
end

def role_name_a
  can :manage, User, id: @user.id
end

def role_name_b

end

answered Feb 16, 2013 at 3:58

CoderHulk

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