1
2
3
4
5
6
7
8
9
10
11
12
13
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
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
|
# This is a model class to represent dogs and is an example of how they have to
# be structured for a better comprehension
class Dog < ApplicationRecord
#### Includes and extends
include AnimalSystems
include ActiveModel::AttributeMethods
#### Constants
NUMBER_OF_LEGS = 4
NUMBER_OF_QUEUES = 1
NUMBER_OF_EYES = 2
POSSIBLE_COLORS = ['white', 'black', 'brown', 'vanilla', 'chocolate', 'dotted'].freeze
#### Self config
self.table_name = 'OBS_dogs'
#### Attributes
attr_accessor :number_of_barks
attribute_method_prefix 'reset_'
alias_method :go_home, :save
alias_method :go_home!, :save!
#### Associations macros (Belongs to, Has one, Has many)
belongs_to :owner, class_name: 'Person'
belongs_to :herd
belongs_to :house
has_one :prefered_person, class_name: 'Person'
has_many :places_to_pee, class_name: 'Place'
has_many :places_to_sleep, through: :house
#### Callbacks macros: before_save, after_save, etc.
before_destroy :bark
after_destroy :cry
#### Scopes (first the default_scope macro if is used)
default_scope where(alive: true)
scope :blacks, -> { where(color: 'brown') }
scope :deads, -> { rewhere(alive: false) }
#### Validations macros
validates :name, :color, pressence: true
#### Class methods using self. (public and then private)
#### To define class methods as private use private_class_method
def self.born!(attributes)
say("It's alive!")
dog = new(attributes)
dog.alive = true
dog.save!
dog.cry
dog
end
def self.killall_by(attributes = {})
say('Die!')
where(attributes).each(&:kill)
end
def self.call_all
say('Fiuuiuuuu!')
all.each(&:bark)
end
#### private
def self.say(string)
puts "[Dog's Master] >> #{string}"
end
private_class_method :say
#### Instance methods (public and then protected/private)
def initialize(attributes = {})
super
@number_of_barks = 0
end
def bark
say('Guau!')
@number_of_barks += 1
end
def cry
say('Iiiiii Iiii Iiiii!!')
end
protected
def say(string)
puts "[#{name}] >> #{string}"
end
private
def reset_attribute(attribute)
send("#{attribute}=", 0)
end
end
|
