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Modify a View修改视图

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To modify a view, you can either:要修改视图，可以执行以下操作之一：

  • Drop and recreate the view.删除并重新创建视图。

  • Use the collMod command.使用collMod命令。

Example实例

Consider the following view named lowStock:考虑以下名为lowStock的视图：

db.createView(
   "lowStock",
   "products",
   [ { $match: { quantity: { $lte: 20 } } } ]
)

Drop and Recreate the View删除并重新创建视图

The following commands modify lowStock by dropping and recreating the view:以下命令通过删除并重新创建视图来修改lowStock：

db.lowStock.drop()

db.createView(
   "lowStock",
   "products",
   [ { $match: { quantity: { $lte: 10 } } } ]
)

Use the collMod Command使用collMod命令

Alternatively, you can use the collMod command to modify the view:或者，可以使用collMod命令修改视图：

db.runCommand( {
   collMod: "lowStock",
   viewOn: "products",
   "pipeline": [ { $match: { quantity: { $lte: 10 } } } ]
} )