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                @@ -171,7 +171,7 @@ class UserCouponInfo(BaseModelMixin): 
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                171
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                171
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                             'has_used': self.has_used, 
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                172
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                172
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                             'admin_id': self.admin_id, 
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                173
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                173
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                             'admin_name': self.admin_name, 
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                174
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                -            'used_at': tc.local_string(utc_dt=self.used_at, format='%Y-%m-%d'), 
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                174
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                +            'used_at': tc.local_string(utc_dt=self.used_at, format='%Y-%m-%d') if self.used_at else '', 
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                175
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                175
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                             'coupon_from': self.activity_name if self.coupon_from == 'PROMOTION' else self.coupon_from, 
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                176
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                             'clerk_name': self.clerk_name, 
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                177
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                177
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                             'distributor_name': self.distributor_name, 
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