code: def build_index(self, idx_name, _type='default'):
          "Build the index related to the `name`."
          indexes = {}
          has_non_string_values = False
          for key, item in self.data.items():
              if idx_name in item:
                  value = item[idx_name]
                  # A non-string index value switches it into a lazy one.
                  if not isinstance(value, six.string_types):
                      has_non_string_values = True
                  if value not in indexes:
                      indexes[value] = set([])
                  indexes[value].add(key)
          self.indexes[idx_name] = indexes
          if self._meta.lazy_indexes or has_non_string_values:
              # Every index is lazy
              _type = 'lazy'
          self.index_defs[idx_name] = {'type': _typef build_index(self, idx_name, _type='default'):
          "Build the index related to the `name`."
          indexes = {}
          has_non_string_values = False
          for key, item in self.data.items():
              if idx_name in item:
                  value = item[idx_name]
                  # A non-string index value switches it into a lazy one.
                  if not isinstance(value, six.string_types):
                      has_non_string_values = True
                  if value not in indexes:
                      indexes[value] = set([])
                  indexes[value].add(key)
          self.indexes[idx_name] = indexes
          if self._meta.lazy_indexes or has_non_string_values:
              # Every index is lazy
              _type = 'lazy'
          self.index_defs[idx_name] = {'type': _type}
docs: Build the index related to the `name`.