Class: Dynamoid::TransactionWrite::Upsert

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

Instance Method Summary collapse

Constructor Details

#initialize(model_class, hash_key, range_key, attributes) ⇒ Upsert

Returns a new instance of Upsert.



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# File 'lib/dynamoid/transaction_write/upsert.rb', line 9

def initialize(model_class, hash_key, range_key, attributes)
  super()

  @model_class = model_class
  @hash_key = hash_key
  @range_key = range_key
  @attributes = attributes
end

Instance Method Details

#aborted? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/dynamoid/transaction_write/upsert.rb', line 27

def aborted?
  false
end

#action_request ⇒ Object 



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# File 'lib/dynamoid/transaction_write/upsert.rb', line 40

def action_request
  # changed attributes to persist
  changes = @attributes.dup
  changes = add_timestamps(changes, skip_created_at: true)
  changes_dumped = Dynamoid::Dumping.dump_attributes(changes, @model_class.attributes)

  # primary key to look up an item to update
  key = { @model_class.hash_key => @hash_key }
  key[@model_class.range_key] = @range_key if @model_class.range_key?

  # Build UpdateExpression and keep names and values placeholders mapping
  # in ExpressionAttributeNames and ExpressionAttributeValues.
  update_expression_statements = []
  expression_attribute_names = {}
  expression_attribute_values = {}

  changes_dumped.each_with_index do |(name, value), i|
    name_placeholder = "#_n#{i}"
    value_placeholder = ":_s#{i}"

    update_expression_statements << "#{name_placeholder} = #{value_placeholder}"
    expression_attribute_names[name_placeholder] = name
    expression_attribute_values[value_placeholder] = value
  end

  update_expression = "SET #{update_expression_statements.join(', ')}"

  {
    update: {
      key: key,
      table_name: @model_class.table_name,
      update_expression: update_expression,
      expression_attribute_names: expression_attribute_names,
      expression_attribute_values: expression_attribute_values
    }
  }
end

#observable_by_user_result ⇒ Object 



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# File 'lib/dynamoid/transaction_write/upsert.rb', line 36

def observable_by_user_result
  nil
end

#on_commit ⇒ Object 



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# File 'lib/dynamoid/transaction_write/upsert.rb', line 23

def on_commit; end

#on_registration ⇒ Object 



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# File 'lib/dynamoid/transaction_write/upsert.rb', line 18

def on_registration
  validate_primary_key!
  Dynamoid::Persistence::UpdateValidations.validate_attributes_exist(@model_class, @attributes)
end

#on_rollback ⇒ Object 



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# File 'lib/dynamoid/transaction_write/upsert.rb', line 25

def on_rollback; end

#skipped? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/dynamoid/transaction_write/upsert.rb', line 31

def skipped?
  attributes_to_assign = @attributes.except(@model_class.hash_key, @model_class.range_key)
  attributes_to_assign.empty? && !@model_class.timestamps_enabled?
end