Class: EmbedsMany::Child

Inherits:
Object
  • Object
show all
Extended by:
ActiveModel::Validations::ClassMethods
Includes:
ActiveModel::Dirty, ActiveModel::Validations
Defined in:
lib/embeds_many/child.rb

Defined Under Namespace

Classes: UniquenessValidator

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(attrs = {}) ⇒ Child

Returns a new instance of Child.



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# File 'lib/embeds_many/child.rb', line 36

def initialize(attrs={})
  @attributes = ActiveSupport::HashWithIndifferentAccess.new

  attrs.each do |name, value|
    if respond_to? "#{name}="
      send("#{name}=", value)
    else
      @attributes[name] = value
    end
  end
end

Instance Attribute Details

#parent ⇒ Object

Returns the value of attribute parent.



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# File 'lib/embeds_many/child.rb', line 20

def parent
  @parent
end

Class Method Details

.embedded_fields(*fields) ⇒ Object

add accessors for fields



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# File 'lib/embeds_many/child.rb', line 8

def self.embedded_fields(*fields)
  fields.each do |field_name|
    define_method(field_name) do
      @attributes[field_name]
    end

    define_method("#{field_name}=") do |val|
      @attributes[field_name] = val
    end
  end
end

.model_name ⇒ Object

validation requires model name



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# File 'lib/embeds_many/child.rb', line 32

def self.model_name
  ActiveModel::Name.new(self, nil, self.name || @field_name.to_s.classify)
end

Instance Method Details

#before_parent_save ⇒ Object 



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# File 'lib/embeds_many/child.rb', line 96

def before_parent_save
  return if @operation_pending or !self.valid?

  if new_record?
    fill_parent_field_new_record!
  else
    fill_parent_field_existing_record!
  end
end

#destroy ⇒ Object 



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# File 'lib/embeds_many/child.rb', line 62

def destroy
  # tell rails the field will change
  parent.send "#{field_name}_will_change!"

  parent.read_attribute(field_name).delete_if {|t| t['id'] == self.id}

  @operation_pending = true

  if parent.update(field_name => parent.read_attribute(field_name))
    parent.send(field_name).child_destroyed(self)

    true
  else
    parent.send "#{field_name}=", parent.send("#{field_name}_was")
    false
  end
ensure
  @operation_pending = false
end

#exists_in_parent?(&block) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/embeds_many/child.rb', line 92

def exists_in_parent?(&block)
  parent.read_attribute(field_name).any? &block
end

#new_record? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/embeds_many/child.rb', line 88

def new_record?
  self.id.nil?
end

#save ⇒ Object 



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# File 'lib/embeds_many/child.rb', line 48

def save
  return false unless self.valid?

  @operation_pending = true

  if new_record?
    save_new_record!
  else
    save_existing_record!
  end
ensure
  @operation_pending = false
end

#update(attrs) ⇒ Object 



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# File 'lib/embeds_many/child.rb', line 82

def update(attrs)
  @attributes.update(attrs)

  save
end