Class: Model

Inherits:
Object
  • Object
show all
Includes:
ValueTransformer
Defined in:
lib/projectile/model.rb

Direct Known Subclasses

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Class Method Summary collapse

Instance Method Summary collapse

Methods included from ValueTransformer

included

Constructor Details

#initialize(json = {}) ⇒ Model 



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# File 'lib/projectile/model.rb', line 170

def initialize(json={})
  self.class.get_relationships.each do |relationship|
    name = relationship[:name]
    default = relationship[:default]
    key_path = relationship[:key_path]
    json_value = json.valueForKeyPath(key_path)
    value_to_send = json_value.nil? ? default : json_value
    self.send("#{name}=", value_to_send) unless value_to_send.nil?
  end

  self.class.get_attributes.each do |attribute|
    name = attribute[:name]
    default = attribute[:default]
    key_path = attribute[:key_path]
    json_value = json.valueForKeyPath(key_path)
    value_to_send = json_value.nil? ? default : json_value
    self.send("#{name}=", value_to_send) unless value_to_send.nil?
  end
end

Class Method Details

.attributes ⇒ Object 



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# File 'lib/projectile/model.rb', line 52

def attributes
  @attributes ||= []
end

.get_attributes ⇒ Object

these methods are needed because subclasses do not inherit class instance variables



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# File 'lib/projectile/model.rb', line 32

def get_attributes
  attributes = []
  klass = self
  while klass.respond_to? :attributes
    attributes += klass.attributes
    klass = klass.superclass
  end
  attributes
end

.get_relationships ⇒ Object 



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# File 'lib/projectile/model.rb', line 42

def get_relationships
  relationships = []
  klass = self
  while klass.respond_to? :relationships
    relationships += klass.relationships
    klass = klass.superclass
  end
  relationships
end

.relationships ⇒ Object 



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# File 'lib/projectile/model.rb', line 76

def relationships
  @relationships ||= []
end

.set_attribute(attribute) ⇒ Object 



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# File 'lib/projectile/model.rb', line 56

def set_attribute(attribute)
  name = attribute[:name]
  type = attribute[:type]
  default = attribute[:default]
  attribute[:key_path] ||= name

  attr_accessor name

  # setter
  define_method("#{name}=") do |value|
    transformer = self.class.value_transformers[type][:to]
    new_value = transformer.call(value) if transformer
    self.willChangeValueForKey name
    self.instance_variable_set("@#{name}", new_value)
    self.didChangeValueForKey name
  end

  self.attributes << attribute
end

.set_relationship(relationship) ⇒ Object 



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# File 'lib/projectile/model.rb', line 80

def set_relationship(relationship)
  name = relationship[:name]
  class_name = relationship[:class_name]
  default = relationship[:default]
  relationship[:key_path] ||= name

  attr_accessor name

  # setter
  define_method("#{name}=") do |value|
    cls = Kernel.const_get(class_name.capitalize)
    new_value = case value
    when Hash
      cls.include?(IdentityMap) ? cls.merge_or_insert(value) : cls.new(value)
    when Array
      value.map {|e| (e.is_a?(cls) ? e : (cls.include?(IdentityMap) ? cls.merge_or_insert(e) : cls.new(e)))}
    when cls
      value
    else
      nil
    end if value

    self.willChangeValueForKey name
    self.instance_variable_set("@#{name}", new_value)
    self.didChangeValueForKey name
  end

  self.relationships << relationship
end

Instance Method Details

#to_hash(serialized_hash_by_model = {}) ⇒ Object 



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# File 'lib/projectile/model.rb', line 111

def to_hash(serialized_hash_by_model={})
  hash = {}
  serialized_hash_by_model[self] = hash

  self.class.get_attributes.each do |attribute|
    name = attribute[:name]
    key_path = attribute[:key_path]
    type = attribute[:type]
    default = attribute[:default]

    # grab value
    model_value = self.send("#{name}")
    next unless model_value

    # create intermediate hashes
    components = key_path.split(".")
    inner_hash = hash
    components.each_with_index do |component, index|
      if index == components.count-1
        transformer = self.class.value_transformers[type][:from]
        inner_hash[component] = transformer.call(model_value)
      else
        hash[component] ||= Hash.new
        inner_hash = hash[component]
      end
    end
  end

  self.class.get_relationships.each do |relationship|
    name = relationship[:name]
    key_path = relationship[:key_path]
    class_name = relationship[:class_name]

    model_value = self.send("#{name}")
    next unless model_value

    components = key_path.split(".")
    inner_hash = hash
    components.each_with_index do |component, index|
      if index == components.count-1
        inner_hash[component] = case model_value
        when Array
          model_value.compact.map do |e|
            serialized_hash_by_model[e] ? serialized_hash_by_model[e].clone : e.to_hash(serialized_hash_by_model)
          end
        when Model
          serialized_hash_by_model[model_value] ? serialized_hash_by_model[model_value].clone : model_value.to_hash(serialized_hash_by_model)
        else
        end
      else
        hash[component] ||= Hash.new
        inner_hash = hash[component]
      end
    end
  end

  hash
end