mongdb查询的结果集中缺少字段 #1192
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mongdb查询的结果集中缺少字段 #1192
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hhyo
approved these changes
Oct 17, 2021
| @@ -825,6 +825,8 @@ def parse_tuple(self, cursor, db_name, tb_name, projection=None): | |||
| result = self.get_all_columns_by_tb(db_name=db_name, tb_name=tb_name) | |||
| columns = result.rows | |||
| columns.insert(0, "mongodballdata") # 隐藏JSON结果列 | |||
| columns = self.fill_query_columns(cursor, columns) | |||
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fill_query_columns方法会解析出cursor（查询结果）中所有包含的字段，检查是否在columns中，如果不在就添加至columns。所以不会遗漏mongodballdata字段
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mongodballdata是为了前台展示json增加的虚拟列，不存在于查询结果中
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fill_query_columns方法只会往columns添加字段，不会影响原来的columns（mongodballdata还在columns中）；可以看一下测试用例test_fill_query_columns
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MongoEngine.get_all_columns_by_tb只取了第一行和最后一行数据的字段名，查询的结果集中可能存在其他的字段，因此需要加上这些字段