How to use join_custom_field method in autotest

Best Python code snippet using autotest_python

query_lib.py

Source:query_lib.py

...99        related_query = self._model.objects.filter(**{self._field: value})100        if not related_query:101            raise ConstraintError('%s %s not found' % (self._model_name, value))102        alias = self._make_alias_fn()103        queryset = queryset.model.objects.join_custom_field(queryset,104                                                            related_query,105                                                            alias)106        if is_inverse:107            condition = '%s.%s IS NULL'108        else:109            condition = '%s.%s IS NOT NULL'110        condition %= (alias,111                      queryset.model.objects.key_on_joined_table(related_query))112        queryset = queryset.model.objects.add_where(queryset, condition)113        return queryset114class _KeyvalConstraint(Constraint):115    def __init__(self, model, key_field, value_field, make_alias_fn):116        self._model = model117        self._key_field = key_field118        self._value_field = value_field119        self._make_alias_fn = make_alias_fn120    def apply_constraint(self, queryset, value, comparison_type, is_inverse):121        if comparison_type not in (None, 'equals'):122            raise ConstraintError('Can only use equals or not equals with '123                                  'this selector')124        if '=' not in value:125            raise ConstraintError('You must specify a key=value pair for this '126                                  'selector')127        key, actual_value = value.split('=', 1)128        related_query = self._model.objects.filter(129                **{self._key_field: key, self._value_field: actual_value})130        alias = self._make_alias_fn()131        queryset = queryset.model.objects.join_custom_field(queryset,132                                                            related_query,133                                                            alias)134        if is_inverse:135            condition = '%s.%s IS NULL'136        else:137            condition = '%s.%s IS NOT NULL'138        condition %= (alias,139                      queryset.model.objects.key_on_joined_table(related_query))140        queryset = queryset.model.objects.add_where(queryset, condition)...

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