| | 51 | def select_related_descend(field, restricted, requested): |
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| | 52 | """ |
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| | 53 | Returns True if this field should be used to descend deeper for |
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| | 54 | select_related() purposes. Used by both the query construction code |
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| | 55 | (sql.query.fill_related_selections()) and the model instance creation code |
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| | 56 | (query.get_cached_row()). |
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| | 57 | """ |
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| | 58 | if not field.rel: |
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| | 59 | return False |
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| | 60 | if field.rel.parent_link: |
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| | 61 | return False |
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| | 62 | if restricted and field.name not in requested: |
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| | 63 | return False |
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| | 64 | if not restricted and field.null: |
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| | 65 | return False |
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| | 66 | return True |
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| | 67 | |
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