Class: HashMapHash

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

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(mapping) ⇒ HashMapHash

Returns a new instance of HashMapHash.



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# File 'lib/hash_map_hash.rb', line 4

def initialize(mapping)
  @mapping = mapping
end

Instance Attribute Details

#mapping ⇒ Object (readonly)

Returns the value of attribute mapping.



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# File 'lib/hash_map_hash.rb', line 2

def mapping
  @mapping
end

Instance Method Details

#add_nested_properties(nested_properties) ⇒ Object 



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# File 'lib/hash_map_hash.rb', line 52

def add_nested_properties(nested_properties)
  @mapping.merge! nested_mapping(nested_properties) if nested_properties.any?
  self
end

#map(source_data) ⇒ Object

Data sample (source_data)

{ ‘Contractors’ =>

{ 'Contractor' =>
  [
    {
      'Value' => 'FirstAid, Moscow',
      'Role' => 'Payer'
    },
    {
      'Value' => '84266',
      'OfficialName' => 'FirstAid, Moscow (442, Glow st)',
      'Role' => 'Receiver'
    }
  ]
},
'Items' => {
  'NumberOfPositions' => 10
},
'Total' => 123.45

}

To get data, we should pass a mapping:

mapping = 

payer:    ['Contractors', 'Contractor', %w(Role Payer), 'Value'],
receiver: ['Contractors', 'Contractor', %w(Role Receiver), 'Value'],
amount:   ['Items', 'NumberOfPositions'],
summ:     'Total'

output: 

payer: 'FirstAid, Moscow',
receiver: '84266',
amount: 10,
summ: 123.45




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# File 'lib/hash_map_hash.rb', line 46

def map(source_data)
  mapping.dup.each_with_object({}) do |(attribute_key, attribute_mapping), result|
    result[attribute_key] = filtered_deep_fetch source_data, Array(attribute_mapping)
  end
end