Class: MetaModel::Record::Association

Inherits:
Object
  • Object
show all
Defined in:
lib/metamodel/record/association.rb

Relation collapse

Instance Attribute Summary collapse

Validation collapse

Relation collapse

Instance Method Summary collapse

Constructor Details

#initialize(name, major_model, secondary_model, relation, args) ⇒ Association

Returns a new instance of Association.



12
13
14
15
16
17
18
19
20
21
22
23
24
 
# File 'lib/metamodel/record/association.rb', line 12

def initialize(name, major_model, secondary_model, relation, args)
  through = args[:through]
  dependent = args[:dependent] || :nullify

  @name            = name.to_s.camelize :lower
  @relation        = relation
  @through         = through.to_s.camelize.singularize unless through.nil?
  @dependent       = dependent
  @major_model     = major_model
  @secondary_model = secondary_model

  validate_association
end

Instance Attribute Details

#dependent ⇒ Object (readonly)

Returns the value of attribute dependent.



7
8
9
 
# File 'lib/metamodel/record/association.rb', line 7

def dependent
  @dependent
end

#major_model ⇒ Object

Returns the value of attribute major_model.



8
9
10
 
# File 'lib/metamodel/record/association.rb', line 8

def major_model
  @major_model
end

#name ⇒ Object (readonly)

Returns the value of attribute name.



4
5
6
 
# File 'lib/metamodel/record/association.rb', line 4

def name
  @name
end

#relation ⇒ Object (readonly)

Returns the value of attribute relation.



6
7
8
 
# File 'lib/metamodel/record/association.rb', line 6

def relation
  @relation
end

#secondary_model ⇒ Object

Returns the value of attribute secondary_model.



9
10
11
 
# File 'lib/metamodel/record/association.rb', line 9

def secondary_model
  @secondary_model
end

#through ⇒ Object

Returns the value of attribute through.



10
11
12
 
# File 'lib/metamodel/record/association.rb', line 10

def through
  @through
end

#type ⇒ Object (readonly)

Returns the value of attribute type.



5
6
7
 
# File 'lib/metamodel/record/association.rb', line 5

def type
  @type
end

Instance Method Details

#belongs_to? ⇒ Boolean

Returns:

  • (Boolean) 


91
92
93
 
# File 'lib/metamodel/record/association.rb', line 91

def belongs_to?
  @relation == :belongs_to
end

#debug_description ⇒ Object 



101
102
103
104
105
106
107
 
# File 'lib/metamodel/record/association.rb', line 101

def debug_description
  if through
    "#{major_model.name}.#{relation}.#{secondary_model.name}.through.#{through.name}.#{dependent}"
  else
    "#{major_model.name}.#{relation}.#{secondary_model.name}.#{dependent}"
  end
end

#expect_constraint?(constraint) ⇒ Boolean

Returns:

  • (Boolean) 


26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
 
# File 'lib/metamodel/record/association.rb', line 26

def expect_constraint?(constraint)
  result = true
  result &= self.major_model == constraint.secondary_model
  result &= self.secondary_model == constraint.major_model
  result &= self.through == constraint.through

  result &= case [self.relation, constraint.relation]
    when [:has_one, :belongs_to], [:belongs_to, :has_one] then true
    when [:belongs_to, :has_many] then
      return false if self.dependent == :destroy
      return true unless constraint.through
      return false
    when [:has_many, :belongs_to] then
      return false if constraint.dependent == :destroy
      return true unless self.through
      return false
    when [:has_many, :has_many] then
      self.through == constraint.through
    else false
  end
  result
end

#has_many? ⇒ Boolean

Returns:

  • (Boolean) 


87
88
89
 
# File 'lib/metamodel/record/association.rb', line 87

def has_many?
  @relation == :has_many
end

#has_one? ⇒ Boolean

Returns:

  • (Boolean) 


83
84
85
 
# File 'lib/metamodel/record/association.rb', line 83

def has_one?
  @relation == :has_one
end

#secondary_model_instance ⇒ Object 



49
50
51
52
53
54
55
 
# File 'lib/metamodel/record/association.rb', line 49

def secondary_model_instance
  case relation
  when :has_many, :has_one then "#{secondary_model.name}.find(privateId)"
  when :belongs_to then "#{secondary_model.name}.find(#{secondary_model.foreign_id})"
  else ""
  end
end

#validate_association ⇒ Object 



61
62
63
64
 
# File 'lib/metamodel/record/association.rb', line 61

def validate_association
  validate_dependent(@dependent)
  validate_through(@through)
end

#validate_dependent(dependent) ⇒ Object

Raises:



66
67
68
69
70
71
 
# File 'lib/metamodel/record/association.rb', line 66

def validate_dependent(dependent)
  supported_dependent_options = [:nullify, :destroy]
  raise Informative, "Unknown dependent option #{dependent}, \
    MetaModel only supports #{supported_dependent_options} now" \
    unless supported_dependent_options.include? dependent
end

#validate_through(through) ⇒ Object

Raises:



73
74
75
76
 
# File 'lib/metamodel/record/association.rb', line 73

def validate_through(through)
  raise Informative, "belongs_to can't coexist with through." \
    if !!through && @relation == :belongs_to
end