Class: RailsAdminImport::Config::Base

Inherits:
Object
  • Object
show all
Defined in:
lib/rails_admin_import/config/base.rb

Direct Known Subclasses

Model

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(parent = nil) ⇒ Base

Returns a new instance of Base.



4
5
 
# File 'lib/rails_admin_import/config/base.rb', line 4

def initialize(parent = nil)
end

Class Method Details

.register_instance_option(option_name, scope = self, &default) ⇒ Object

Register an instance option. Instance option is a configuration option that stores its value within an instance variable and is accessed by an instance method. Both go by the name of the option.



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
53
54
55
56
57
58
59
 
# File 'lib/rails_admin_import/config/base.rb', line 16

def self.register_instance_option(option_name, scope = self, &default)
  unless options = scope.instance_variable_get("@config_options")
    options = scope.instance_variable_set("@config_options", {})
  end

  option_name = option_name.to_s

  options[option_name] = nil

  # If it's a boolean create an alias for it and remove question mark
  if "?" == option_name[-1, 1]
    scope.send(:define_method, "#{option_name.chop!}?") do
      send(option_name)
    end
  end

  # Define getter/setter by the option name
  scope.send(:define_method, option_name) do |*args, &block|
    if !args[0].nil? || block
      # Invocation with args --> This is the declaration of the option, i.e. setter
      instance_variable_set("@#{option_name}_registered", args[0].nil? ? block : args[0])
    else
      # Invocation without args nor block --> It's the use of the option, i.e. getter
      value = instance_variable_get("@#{option_name}_registered")
      case value
        when Proc
          # Track recursive invocation with an instance variable. This prevents run-away recursion
          # and allows configurations such as
          # label { "#{label}".upcase }
          # This will use the default definition when called recursively.
          if instance_variable_get("@#{option_name}_recurring")
            value = instance_eval &default
          else
            instance_variable_set("@#{option_name}_recurring", true)
            value = instance_eval &value
            instance_variable_set("@#{option_name}_recurring", false)
          end
        when nil
          value = instance_eval &default
      end
      value
    end
  end
end

Instance Method Details

#register_instance_option(option_name, &default) ⇒ Object

Register an instance option for this object only



8
9
10
11
 
# File 'lib/rails_admin_import/config/base.rb', line 8

def register_instance_option(option_name, &default)
  scope = class << self; self; end;
  self.class.register_instance_option(option_name, scope, &default)
end