| 1 | The exception is raised because in file django/contrib/admin/options.py the method lookup_allowed in class BaseModelAdmin will return 'False' for this filter query.
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| 2 |
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| 3 | This method receives value 'employee__person_ptr__exact' in paramter 'lookup'.
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| 4 |
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| 5 | The 'lookup' is splitted by the lookup_seperator ('--'). Code snippet:
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| 6 |
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| 7 | 209 parts = lookup.split(LOOKUP_SEP)
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| 8 |
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| 9 | So, 'parts' will now contain: ['employee', 'person_ptr', 'exact']
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| 10 |
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| 11 |
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| 12 | The last term is ignored since it is a query term. Code snippet:
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| 13 |
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| 14 | 211 # Last term in lookup is a query term (__exact, __startswith etc)
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| 15 | 212 # This term can be ignored.
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| 16 | 213 if len(parts) > 1 and parts[-1] in QUERY_TERMS:
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| 17 | 214 parts.pop()
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| 18 |
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| 19 | Now 'parts' contains: ['employee', 'person_ptr']
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| 20 |
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| 21 | The first element from 'parts' is tried to be a 'field' of the class. 'employee' indeed is, so the 'else' part of the exception handler is executed. A variable 'clean_lookup' is made which concats the two values of 'parts' together. 'clean_lookup' has the value 'employee__person_ptr'. This string is not included in 'list_filter' and not included in 'date_hierarchy'. So 'False' is returned. Lookup is not allowed. Code snippet:
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| 22 |
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| 23 | 235 try:
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| 24 | 236 self.model._meta.get_field_by_name(parts[0])
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| 25 | 237 except FieldDoesNotExist:
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| 26 | 238 # Lookups on non-existants fields are ok, since they're ignored
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| 27 | 239 # later.
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| 28 | 240 return True
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| 29 | 241 else:
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| 30 | 242 if len(parts) == 1:
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| 31 | 243 return True
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| 32 | 244 clean_lookup = LOOKUP_SEP.join(parts)
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| 33 | 245 return clean_lookup in self.list_filter or clean_lookup == self.date_hierarchy
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| 34 |
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