Class: ROM::SQL::Association::ManyToOne

Inherits:
ROM::SQL::Association show all
Defined in:
lib/rom/sql/association/many_to_one.rb

Instance Method Summary collapse

Instance Method Details

#associate(relations, child, parent) ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future. 



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# File 'lib/rom/sql/association/many_to_one.rb', line 48

def associate(relations, child, parent)
  fk, pk = join_key_map(relations)
  child.merge(fk => parent.fetch(pk))
end

#call(relations, left = relations[target.relation]) ⇒ Object 



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# File 'lib/rom/sql/association/many_to_one.rb', line 8

def call(relations, left = relations[target.relation])
  right = relations[source.relation]

  left_pk = left.primary_key
  right_fk = left.foreign_key(source.relation)

  left_schema = left.schema
  right_schema = right.schema.project_pk

  schema =
    if left.schema.key?(right_fk)
      left_schema
    else
      left_schema.merge(right_schema.project_fk(left_pk => right_fk))
    end.qualified

  relation = left
    .inner_join(source_table, join_keys(relations))
    .order(*right_schema.qualified)

  if view
    apply_view(schema, relation)
  else
    schema.(relation)
  end
end

#combine_keys(relations) ⇒ Object 



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# File 'lib/rom/sql/association/many_to_one.rb', line 36

def combine_keys(relations)
  Hash[*with_keys(relations)]
end

#join_keys(relations) ⇒ Object 



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# File 'lib/rom/sql/association/many_to_one.rb', line 41

def join_keys(relations)
  with_keys(relations) { |source_key, target_key|
    { qualify(source_alias, source_key) => qualify(target, target_key) }
  }
end