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                @@ -554,7 +554,7 @@ class MemberActivityInfo(BaseModelMixin, BrandInfoMixin): 
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                             'poster_kv_img_url': self.post_kv_image_url, 
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                             'poster_content': self.poster_content, 
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                             'contribution_content_placeholder': self.contribution_content_placeholder, 
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                -            'fields': json.loads(self.fields) if self.fields else '', 
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                557
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                +            'fields': json.loads(self.fields) if self.fields else [], 
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                             'main_activity_id': self.main_activity_id, 
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                             'limit_contribute_num': self.limit_contribute_num, 
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                             'is_series': self.is_series, 
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                @@ -597,7 +597,7 @@ class MemberActivityInfo(BaseModelMixin, BrandInfoMixin): 
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                             'poster_kv_img_url': self.final_poster_kv_img_url, 
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                             'poster_content': self.poster_content, 
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                             'contribution_content_placeholder': self.contribution_content_placeholder, 
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                -            'fields': json.loads(self.fields) if self.fields else '', 
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                +            'fields': json.loads(self.fields) if self.fields else [], 
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                             'main_activity_id': self.main_activity_id, 
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                             'limit_contribute_num': self.limit_contribute_num, 
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                             'is_series': self.is_series, 
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                @@ -642,7 +642,7 @@ class MemberActivityInfo(BaseModelMixin, BrandInfoMixin): 
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                             'poster_content': self.poster_content, 
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                             'contribution_content_placeholder': self.contribution_content_placeholder, 
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                             'welfares': self.welfares, 
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                -            'fields': json.loads(self.fields) if self.fields else '', 
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                +            'fields': json.loads(self.fields) if self.fields else [], 
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                             'main_activity_id': self.main_activity_id, 
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                             'limit_contribute_num': self.limit_contribute_num, 
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                             'is_series': self.is_series, 
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                @@ -692,7 +692,7 @@ class MemberActivityInfo(BaseModelMixin, BrandInfoMixin): 
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                             'poster_content': self.poster_content, 
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                             'contribution_content_placeholder': self.contribution_content_placeholder, 
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                             'welfares': self.welfares, 
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                -            'fields': json.loads(self.fields) if self.fields else '', 
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                695
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                +            'fields': json.loads(self.fields) if self.fields else [], 
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                             'main_activity_id': self.main_activity_id, 
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                             'limit_contribute_num': self.limit_contribute_num, 
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                             'is_series': self.is_series, 
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