Class: ObjectMomma::Builder

Inherits:
Object
  • Object
show all
Extended by:
ClassAttributes
Defined in:
lib/object_momma/builder.rb

Class Method Summary collapse

Instance Method Summary collapse

Methods included from ClassAttributes

class_attribute, inherited

Constructor Details

#initialize(child) ⇒ Builder

Returns a new instance of Builder.



48
49
50
 
# File 'lib/object_momma/builder.rb', line 48

def initialize(child)
  @child = child
end

Class Method Details

.builder_for(object_type) ⇒ Object 



61
62
63
64
65
66
67
68
69
70
71
72
 
# File 'lib/object_momma/builder.rb', line 61

def self.builder_for(object_type)
  if ObjectMomma.builder_path
    builder_file = File.join(ObjectMomma.builder_path, "#{object_type}_builder.rb")
    require builder_file if File.size?(builder_file)
  end

  classified_name = "_#{object_type}Builder".gsub(/_\w/) do |underscored|
    underscored[1].upcase
  end

  ObjectMomma.const_get(classified_name)
end

.child_id(&block) ⇒ Object 



132
133
134
 
# File 'lib/object_momma/builder.rb', line 132

def child_id(&block)
  self.child_id_serializer = block
end

.has_child_id_serializer? ⇒ Boolean

Returns:

  • (Boolean) 


74
75
76
 
# File 'lib/object_momma/builder.rb', line 74

def self.has_child_id_serializer?
  self.child_id_serializer.respond_to?(:to_proc)
end

.has_siblings(*args) ⇒ Object 



136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
 
# File 'lib/object_momma/builder.rb', line 136

def has_siblings(*args)
  if args.last.is_a?(Hash)
    hash = args.pop.each_with_object({}) do |(sibling_name, object_type), hash|
      hash[sibling_name] = object_type
    end
  else
    hash = {}
  end

  args.each_with_object(hash) do |sibling_name|
    object_type = sibling_name
    hash[sibling_name] = object_type
  end

  self.siblings = hash
end

.has_siblings? ⇒ Boolean

Returns:

  • (Boolean) 


78
79
80
 
# File 'lib/object_momma/builder.rb', line 78

def self.has_siblings?
  self.siblings.is_a?(Hash)
end

.run_with_binding(props = {}, &block) ⇒ Object 



82
83
84
85
86
87
88
89
90
91
92
93
94
 
# File 'lib/object_momma/builder.rb', line 82

def self.run_with_binding(props = {}, &block)
  Object.new.tap do |o|
    props.each do |name, value|
      ivar_name = "@#{name}".to_sym
      o.singleton_class.class_eval do
        define_method(name) { instance_variable_get(ivar_name) }
      end
      o.instance_variable_set(ivar_name, value)
    end

    o.singleton_class.class_eval(&block) if block_given?
  end.instance_exec(&child_id_serializer)
end

.string_to_hash(object_type, string) ⇒ Object 



96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
 
# File 'lib/object_momma/builder.rb', line 96

def self.string_to_hash(object_type, string)
  builder = builder_for(object_type)

  if builder.has_child_id_serializer?
    vars = []

    builder.run_with_binding(vars: vars) do
      def method_missing(sym, *args, &block)
        return super unless args.empty? && !block_given?
        vars << sym unless vars.include?(sym)
      end
    end

    string_matcher = "([#{VALID_IDENTIFIER_CHARS}]+)"
    regex_string = builder.run_with_binding(string_matcher: string_matcher) do
      def method_missing(sym, *args, &block)
        return super unless args.empty? && !block_given?
        string_matcher
      end
    end

    regex = Regexp.new("^#{regex_string}$")
    matches = string.match(regex).to_a[1..-1]

    if matches.nil?
      raise BadChildIdentifier, "Bad child_id `#{string}' for builder "\
        "`#{name}'"
    end

    Hash[vars.zip(matches)]
  else
    {child_id: string}
  end
end

Instance Method Details

#build!(*args) ⇒ Object

Raises:

  • (Objectmomma::SubclassNotImplemented) 


40
41
42
 
# File 'lib/object_momma/builder.rb', line 40

def build!(*args)
  raise Objectmomma::SubclassNotImplemented
end

#build_child_from_hash(hash, &block) ⇒ Object 



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
 
# File 'lib/object_momma/builder.rb', line 12

def build_child_from_hash(hash, &block)
  if has_child_id_serializer?
    child.child_id = self.class.run_with_binding(hash)

    hash.each do |name, value|
      if has_siblings?
        sibling_object_type = self.class.siblings[name]
        if sibling_object_type
          if value.is_a?(ObjectMomma::Child)
            child = value
          else
            child = yield(sibling_object_type, value)
          end
          value = child.child_object
        end
      end

      ivar_name = "@#{name}"
      instance_variable_set(ivar_name, value)
      self.singleton_class.instance_exec(name, ivar_name) do |name, ivar_name|
        define_method(name) { instance_variable_get(ivar_name) }
      end
    end
  else
    child.child_id = hash.delete(:child_id)
  end
end

#child_id ⇒ Object 



44
45
46
 
# File 'lib/object_momma/builder.rb', line 44

def child_id
  child.child_id
end

#is_persisted?(object) ⇒ Boolean

Returns:

  • (Boolean) 


52
53
54
55
56
57
58
59
 
# File 'lib/object_momma/builder.rb', line 52

def is_persisted?(object)
  if object.respond_to?(:persisted?)
    object.persisted?
  else
    raise ObjectMomma::SubclassNotImplemented, "Override #is_persisted? "\
      "to support objects that do not respond to #persisted?"
  end
end