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 



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

def initialize(child)
  @child = child
end

Class Method Details

.builder_for(object_type) ⇒ Object 



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# 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 



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

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

.has_child_id_serializer? ⇒ Boolean 



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# 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 



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# 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 



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

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

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



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# 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 



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# 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) 


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

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

#build_child_from_hash(hash, &block) ⇒ Object 



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# 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 



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

def child_id
  child.child_id
end

#is_persisted?(object) ⇒ Boolean 



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# 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