Class: SequelMapper::ManyToOneAssociation

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

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(mapping_name:, foreign_key:, key:, proxy_factory:) ⇒ ManyToOneAssociation

Returns a new instance of ManyToOneAssociation.



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# File 'lib/sequel_mapper/many_to_one_association.rb', line 5

def initialize(mapping_name:, foreign_key:, key:, proxy_factory:)
  @mapping_name = mapping_name
  @foreign_key = foreign_key
  @key = key
  @proxy_factory = proxy_factory
end

Instance Attribute Details

#mapping_name ⇒ Object (readonly)

Returns the value of attribute mapping_name.



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# File 'lib/sequel_mapper/many_to_one_association.rb', line 12

def mapping_name
  @mapping_name
end

Instance Method Details

#build_proxy(data_superset:, loader:, record:) ⇒ Object 



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# File 'lib/sequel_mapper/many_to_one_association.rb', line 17

def build_proxy(data_superset:, loader:, record:)
  proxy_factory.call(
    query: build_query(data_superset, record),
    loader: loader,
    preloaded_data: {
      key => foreign_key_value(record),
    },
  )
end

#build_query(superset, record) ⇒ Object 



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# File 'lib/sequel_mapper/many_to_one_association.rb', line 33

def build_query(superset, record)
  superset.where(key => foreign_key_value(record))
end

#dump(parent_record, collection, &block) ⇒ Object Also known as: delete 



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# File 'lib/sequel_mapper/many_to_one_association.rb', line 37

def dump(parent_record, collection, &block)
  collection.flat_map { |object|
    block.call(mapping_name, object, _foreign_key_does_not_go_here = {})
      .flat_map { |associated_record|
        foreign_key_pair = {
          foreign_key => associated_record.fetch(key),
        }

        [
          associated_record,
          parent_record.merge(foreign_key_pair),
        ]
      }
  }
end

#eager_superset(superset, associated_dataset) ⇒ Object 



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# File 'lib/sequel_mapper/many_to_one_association.rb', line 27

def eager_superset(superset, associated_dataset)
  Dataset.new(
    superset.where(key => associated_dataset.select(foreign_key)).to_a
  )
end