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Refs #28459 -- Improved performance of select_related() when model is prefetched from its parent.
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@ -1665,21 +1665,10 @@ class RelatedPopulator:
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]
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self.reorder_for_init = None
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else:
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model_init_attnames = [
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f.attname for f in klass_info['model']._meta.concrete_fields
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]
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reorder_map = []
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for idx in select_fields:
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field = select[idx][0].target
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init_pos = model_init_attnames.index(field.attname)
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reorder_map.append((init_pos, field.attname, idx))
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reorder_map.sort()
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self.init_list = [v[1] for v in reorder_map]
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pos_list = [row_pos for _, _, row_pos in reorder_map]
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def reorder_for_init(row):
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return [row[row_pos] for row_pos in pos_list]
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self.reorder_for_init = reorder_for_init
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attname_indexes = {select[idx][0].target.attname: idx for idx in select_fields}
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model_init_attnames = (f.attname for f in klass_info['model']._meta.concrete_fields)
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self.init_list = [attname for attname in model_init_attnames if attname in attname_indexes]
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self.reorder_for_init = operator.itemgetter(*[attname_indexes[attname] for attname in self.init_list])
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self.model_cls = klass_info['model']
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self.pk_idx = self.init_list.index(self.model_cls._meta.pk.attname)
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