2ndtry.py

@KeyTransform.register_lookup
class KeyTransformIsInteger(KeyTransformTextLookupMixin, Lookup):
    lookup_name = "is_int"

    def as_sql(self, compiler, connection):
            import ipdb

            ipdb.set_trace()
        lhs, lhs_params = self.process_lhs(compiler, connection)
        rhs, rhs_params = self.process_rhs(compiler, connection)

        params = lhs_params + lhs_params + rhs_params
        sql = "(jsonb_typeof(%s) = 'number' AND (%s)::numeric %% 1 = 0) is %s"
        result = sql % (lhs, lhs, rhs), params
        return result

2ndtry.sh

> /app/rea/models/structural/linkages.py(31)as_sql()
     30         result = sql % (lhs, lhs, rhs), params
---> 31         return result
     32

ipdb> result
('(jsonb_typeof(("linkage" #>> %s)) = \'number\' AND (("linkage" #>> %s))::numeric % 1 = 0) is %s', [['root', 'in_subproject'], ['root', 'in_subproject'], 'True'])

3rdtry.py

@KeyTransform.register_lookup
class KeyTransformIsInteger(KeyTransformTextLookupMixin, Lookup):
    lookup_name = "is_int"

    def as_sql(self, compiler, connection):
        import ipdb

        ipdb.set_trace()
        lhs_sql, params = self.process_lhs(compiler, connection)
        rhs_sql, rhs_params = self.process_rhs(compiler, connection)
        params.extend(params)
        params.extend(rhs_params)
        sql = "(jsonb_typeof(%s) = 'number' AND (%s)::numeric %% 1 = 0) IS %s"
        result = sql % (lhs_sql, lhs_sql, rhs_sql), params
        return result

3rdtry.sh

 File "/usr/local/lib/python3.7/site-packages/django/db/backends/base/schema.py", line 343, in add_constraint
    sql = constraint.create_sql(model, self)
  File "/usr/local/lib/python3.7/site-packages/django/db/models/constraints.py", line 47, in create_sql
    check = self._get_check_sql(model, schema_editor)
  File "/usr/local/lib/python3.7/site-packages/django/db/models/constraints.py", line 40, in _get_check_sql
    return sql % tuple(schema_editor.quote_value(p) for p in params)
ValueError: unsupported format character ' ' (0x20) at index 82

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when i debug.sh

ipdb> lhs_sql
'("linkage" #>> %s)'

ipdb> lhs_params
[['root', 'in_subproject']]