Class: SequelMapper::ManyToManyAssociation

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

Defined Under Namespace

Classes: JoinedDataset

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(mapping_name:, foreign_key:, key:, proxy_factory:, association_foreign_key:, association_key:, join_mapping_name:, join_dataset:, order:) ⇒ ManyToManyAssociation

Returns a new instance of ManyToManyAssociation.



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

def initialize(mapping_name:, foreign_key:, key:, proxy_factory:, association_foreign_key:, association_key:, join_mapping_name:, join_dataset:, order:)
  @mapping_name = mapping_name
  @foreign_key = foreign_key
  @key = key
  @proxy_factory = proxy_factory
  @association_foreign_key = association_foreign_key
  @association_key = association_key
  @join_mapping_name = join_mapping_name
  @join_dataset = join_dataset
  @order = order
end

Instance Attribute Details

#join_mapping_name ⇒ Object (readonly)

Returns the value of attribute join_mapping_name.



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

def join_mapping_name
  @join_mapping_name
end

#mapping_name ⇒ Object (readonly)

Returns the value of attribute mapping_name.



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

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_many_association.rb', line 22

def build_proxy(data_superset:, loader:, record:)
 proxy_factory.call(
    query: build_query(data_superset, record),
    loader: ->(record_list) {
      record = record_list.first
      join_records = record_list.last

      loader.call(record, join_records)
    },
    mapping_name: mapping_name,
  )
end

#build_query(superset, parent_record) ⇒ Object 



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# File 'lib/sequel_mapper/many_to_many_association.rb', line 50

def build_query(superset, parent_record)
  order
    .apply(
      superset.join(join_mapping_name, association_foreign_key => key)
        .where(foreign_key => foreign_key_value(parent_record))
    )
    .lazy.map { |record|
      [record, [foreign_keys(parent_record, record)]]
    }
end

#delete(parent_record, collection, &block) ⇒ Object 



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# File 'lib/sequel_mapper/many_to_many_association.rb', line 141

def delete(parent_record, collection, &block)
  flat_list_of_just_join_records(parent_record, collection, &block)
end

#dump(parent_record, collection, &block) ⇒ Object 



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# File 'lib/sequel_mapper/many_to_many_association.rb', line 137

def dump(parent_record, collection, &block)
  flat_list_of_records_and_join_records(parent_record, collection, &block)
end

#eager_superset(superset, associated_dataset) ⇒ Object 



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# File 'lib/sequel_mapper/many_to_many_association.rb', line 35

def eager_superset(superset, associated_dataset)
  # TODO: All these keys can be confusing, write some focused tests.
  eager_join_dataset = Dataset.new(
    join_dataset
      .where(foreign_key => associated_dataset.select(association_key))
      .to_a
  )

  eager_dataset = superset
    .where(key => eager_join_dataset.select(association_foreign_key))
    .to_a

  JoinedDataset.new(eager_dataset, eager_join_dataset)
end