Class: Dynamoid::TransactionWrite::ItemUpdater

Inherits:
Object
  • Object
show all
Defined in:
lib/dynamoid/transaction_write/item_updater.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(model_class) ⇒ ItemUpdater

Returns a new instance of ItemUpdater.



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# File 'lib/dynamoid/transaction_write/item_updater.rb', line 8

def initialize(model_class)
  @model_class = model_class

  @attributes_to_set = {}
  @attributes_to_add = {}
  @attributes_to_delete = {}
  @attributes_to_remove = []
end

Instance Attribute Details

#attributes_to_add ⇒ Object (readonly)

Returns the value of attribute attributes_to_add.



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# File 'lib/dynamoid/transaction_write/item_updater.rb', line 6

def attributes_to_add
  @attributes_to_add
end

#attributes_to_delete ⇒ Object (readonly)

Returns the value of attribute attributes_to_delete.



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# File 'lib/dynamoid/transaction_write/item_updater.rb', line 6

def attributes_to_delete
  @attributes_to_delete
end

#attributes_to_remove ⇒ Object (readonly)

Returns the value of attribute attributes_to_remove.



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# File 'lib/dynamoid/transaction_write/item_updater.rb', line 6

def attributes_to_remove
  @attributes_to_remove
end

#attributes_to_set ⇒ Object (readonly)

Returns the value of attribute attributes_to_set.



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# File 'lib/dynamoid/transaction_write/item_updater.rb', line 6

def attributes_to_set
  @attributes_to_set
end

Instance Method Details

#add(attributes) ⇒ Object

increments a number or adds to a set, starts at 0 or [] if it doesn’t yet exist



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# File 'lib/dynamoid/transaction_write/item_updater.rb', line 38

def add(attributes)
  validate_attribute_names!(attributes.keys)
  @attributes_to_add.merge!(attributes)
end

#delete(attributes) ⇒ Object

deletes a value or values from a set



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# File 'lib/dynamoid/transaction_write/item_updater.rb', line 44

def delete(attributes)
  validate_attribute_names!(attributes.keys)
  @attributes_to_delete.merge!(attributes)
end

#empty? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/dynamoid/transaction_write/item_updater.rb', line 17

def empty?
  [@attributes_to_set, @attributes_to_add, @attributes_to_delete, @attributes_to_remove].all?(&:empty?)
end

#remove(*names) ⇒ Object

adds to array of fields for use in REMOVE update expression



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# File 'lib/dynamoid/transaction_write/item_updater.rb', line 32

def remove(*names)
  validate_attribute_names!(names)
  @attributes_to_remove += names
end

#set(attributes) ⇒ Object 



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# File 'lib/dynamoid/transaction_write/item_updater.rb', line 21

def set(attributes)
  validate_attribute_names!(attributes.keys)
  if Dynamoid.config.store_attribute_with_nil_value
    @attributes_to_set.merge!(attributes)
  else
    @attributes_to_set.merge!(attributes.reject { |_, v| v.nil? })
    @attributes_to_remove += attributes.select { |_, v| v.nil? }.keys
  end
end