Class: NullObject

Inherits:
Object
  • Object
show all
Defined in:
lib/maybe_null/null_object.rb

Overview

Null object [en.wikipedia.org/wiki/Null_Object_pattern]

Instance Method Summary collapse

Dynamic Method Handling

This class handles dynamic methods through the method_missing method

#method_missing(*args, &block) ⇒ NullObject

Returns:



7
8
9
 
# File 'lib/maybe_null/null_object.rb', line 7

def method_missing(*args, &block)
  self
end

Instance Method Details

#==(other) ⇒ Object 



53
54
55
 
# File 'lib/maybe_null/null_object.rb', line 53

def ==(other)
  other.is_a?(self.class)
end

#blank? ⇒ Boolean

Returns:

  • (Boolean) 


19
20
21
 
# File 'lib/maybe_null/null_object.rb', line 19

def blank?
  true
end

#nil? ⇒ Boolean

Returns:

  • (Boolean) 


15
16
17
 
# File 'lib/maybe_null/null_object.rb', line 15

def nil?
  true
end

#presence ⇒ NilClass

Returns:

  • (NilClass) 


28
29
30
 
# File 'lib/maybe_null/null_object.rb', line 28

def presence
  nil
end

#present? ⇒ Boolean

Returns:

  • (Boolean) 


23
24
25
 
# File 'lib/maybe_null/null_object.rb', line 23

def present?
  false
end

#respond_to?(*args) ⇒ Boolean

Returns:

  • (Boolean) 


11
12
13
 
# File 'lib/maybe_null/null_object.rb', line 11

def respond_to?(*args)
  true
end

#to_a ⇒ Array

Returns:

  • (Array) 


33
 
# File 'lib/maybe_null/null_object.rb', line 33

def to_a; [] end

#to_boolean ⇒ Boolean

Returns:

  • (Boolean) 


48
 
# File 'lib/maybe_null/null_object.rb', line 48

def to_boolean; false end

#to_f ⇒ Float

Returns:

  • (Float) 


39
 
# File 'lib/maybe_null/null_object.rb', line 39

def to_f; 0.0 end

#to_hash ⇒ Hash

Returns:

  • (Hash) 


51
 
# File 'lib/maybe_null/null_object.rb', line 51

def to_hash; {} end

#to_i ⇒ Integer

Returns:

  • (Integer) 


42
 
# File 'lib/maybe_null/null_object.rb', line 42

def to_i; 0 end

#to_int ⇒ Integer

Returns:

  • (Integer) 


45
 
# File 'lib/maybe_null/null_object.rb', line 45

def to_int; 0 end

#to_s ⇒ String

Returns:

  • (String) 


36
 
# File 'lib/maybe_null/null_object.rb', line 36

def to_s; "" end