Module: NestedLoadAndAuthorize

Defined in:
lib/generators/templates/lib/nested_load_and_authorize.rb

Instance Method Summary collapse

Instance Method Details

#load_and_authorize(name, options = {}) ⇒ Object

load and authorise the resource with the same parameters as the Can Can controller additions class macro load_and_authorize_resource.

This differs in that it is an instance method, so you must call it in a before_filter (or from another instance method).

This method has no effect if the resource is already loaded.

Any block passed to this method will be executed if the resource was successfully loaded by this call. Nested calls automatically supply the :through parameter. To bypass this, set :through => nil. rubocop:disable



14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
 
# File 'lib/generators/templates/lib/nested_load_and_authorize.rb', line 14

def load_and_authorize(name, options = {})
  @_through_stack ||= []

  # only touch can can if the instance variable is nil
  resource = instance_variable_get("@#{name}")
  if resource.nil?
    # apply if, only and except behaviours just is if this was done by before_filter
    proceed = true
    proceed &&= [*options[:only]].include?(action_name.to_sym) if options[:only]
    proceed &&= ![*options[:except]].include?(action_name.to_sym) if options[:except]
    proceed &&= case options[:if]
                  when Symbol
                    send(options[:if])
                  when Proc
                    options[:if].call
                  when nil
                    true
                end

    if proceed
      # automatically load this resource through a nested one unless manually specified
      options[:through] = @_through_stack.last unless @_through_stack.empty? || options.include?(:through)
      # create the can can resource class
      cancan = self.class.cancan_resource_class.new(self, name, options.except(:if, :only, :except, :param))
      resource = cancan.load_resource
      cancan.authorize_resource unless options[:skip_authorize]
      if resource && block_given?
        # only call block if we got an instance variable set
        begin
          @_through_stack.push(name)
          yield
        ensure
          @_through_stack.pop
        end
      end
    end
  end
  resource
end

#load_and_authorize_if_present(name, options = {}, &block) ⇒ Object

load the resource only if its request parameter is present. This allows for optional nesting to work like shallow routes with the before_filter way of doing things.



62
63
64
65
66
67
 
# File 'lib/generators/templates/lib/nested_load_and_authorize.rb', line 62

def load_and_authorize_if_present(name, options = {}, &block)
  key = options[:id_param] || "#{name}_id"
  if params[key]
    load_and_authorize(name, options, &block)
  end
end

#load_resource(name, options = {}, &block) ⇒ Object

syntactic sugar for adding the :skip_authorize option



55
56
57
58
 
# File 'lib/generators/templates/lib/nested_load_and_authorize.rb', line 55

def load_resource(name, options = {}, &block)
  options[:skip_authorize] = true
  load_and_authorize(name, options, &block)
end