Class: Mara::AttributeFormatter

Inherits:
Object
  • Object
show all
Defined in:
lib/mara/attribute_formatter.rb

Overview

Helper class that provides Attribute Formatting for DynamoDB values.

Author:

  • Maddie Schipper

Since:

  • 1.0.0

Defined Under Namespace

Classes: Error

Class Method Summary collapse

Class Method Details

.flatten(value) ⇒ Object

Convert a Aws::DynamoDB::Types::AttributeValue to a raw value

Parameters:

  • value (Aws::DynamoDB::Types::AttributeValue) —

    The value to convert

Returns:

  • (Object)

Since:

  • 1.0.0



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# File 'lib/mara/attribute_formatter.rb', line 65

def flatten(value)
  unless value.is_a?(Aws::DynamoDB::Types::AttributeValue)
    raise ArgumentError, 'Not an attribute type'
  end

  if value.s.present?
    value.s
  elsif value.n.present?
    format_number(value.n)
  elsif value.ss.present?
    Set.new(value.ss)
  elsif value.ns.present?
    Set.new(value.ns.map { |v| format_number(v) })
  elsif value.m.present?
    flatten_hash(value.m)
  elsif value.l.present?
    flatten_array(value.l)
  elsif value.null
     Mara::NULL
  elsif !value.bool.nil?
    value.bool
  else
    raise Error, 'Unexpected value type from DynamoDB'
  end
end

.format(value) ⇒ Hash

Format a value into a DynamoDB valid format.

Parameters:

  • value (Object) —

    The value to be formatted.

Returns:

  • (Hash)

Since:

  • 1.0.0



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# File 'lib/mara/attribute_formatter.rb', line 30

def format(value)
  case value
  when true, false
    { bool: value }
  when nil,  Mara::NullValue
    { null: true }
  when String
    { s: value }
  when Symbol
    { s: value.to_s }
  when Numeric
    { n: value.to_s }
  when Time
    { n: value.utc.to_i.to_s }
  when DateTime, Date
    format(value.to_time)
  when Hash
    format_hash(value)
  when Array
    format_array(value)
  when Set
    format_set(value)
  else
    raise Error, "Unexpected value type #{value.class.name} <#{value}>"
  end
end