Class: Xing::Builders::ListDifferenceBuilder

Inherits:
Object
  • Object
show all
Includes:
Services::Locator
Defined in:
lib/xing/builders/list_difference_builder.rb

Direct Known Subclasses

OrderedListDifferenceBuilder

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods included from Services::Locator

#normalize_path, #route_to, #router

Constructor Details

#initialize(list_data, collection, mapper_class) ⇒ ListDifferenceBuilder

list_data is is an array of JSON objects passed in by the mapper (the new list of records) collection is the ActiveRecord collection of existing records (i.e. person.pets, rainbow.colors, book.chapters)



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# File 'lib/xing/builders/list_difference_builder.rb', line 10

def initialize(list_data, collection, mapper_class)
  @list_data = list_data
  @collection = collection
  @mapper_class = mapper_class

  @errors = Hash.new { |hash, key| hash[key] = {} }
end

Instance Attribute Details

#errors ⇒ Object (readonly)

Returns the value of attribute errors.



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# File 'lib/xing/builders/list_difference_builder.rb', line 18

def errors
  @errors
end

Instance Method Details

#build ⇒ Object 



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# File 'lib/xing/builders/list_difference_builder.rb', line 20

def build
  sort_json_items
  map_items

  { save: @new_list, delete: @delete_ids }
end

#locator_for(data) ⇒ Object 



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# File 'lib/xing/builders/list_difference_builder.rb', line 41

def locator_for(data)
 route_to(data[:links][:self])[:id].to_i
end

#map_items ⇒ Object 



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# File 'lib/xing/builders/list_difference_builder.rb', line 45

def map_items
  @new_list = []
  @list_data.each_with_index do |item, index|

    mapper = @mapper_class.new(item[:incoming], item[:locator])

    # Sets association, attributes
    @collection << mapper.record
    mapper.perform_mapping

    @new_list << mapper
    @errors[index] = mapper.errors[:data] unless mapper.errors[:data].blank?
  end
end

#set_locator(data) ⇒ Object 



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# File 'lib/xing/builders/list_difference_builder.rb', line 37

def set_locator(data)
  locator_for(data) unless (data[:links] || {})[:self].blank?
end

#sort_json_items ⇒ Object 



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# File 'lib/xing/builders/list_difference_builder.rb', line 27

def sort_json_items
  @existing_ids = @collection.map{|item| item.send(@mapper_class.locator_attribute_name)}

  @list_data = @list_data.map do |data|
    { :locator => set_locator(data), :incoming => data}
  end

  @delete_ids = @existing_ids - @list_data.map { |item| item[:locator] }
end