如何使用Casbah更新mongoDB中对象的嵌套数组

我的MongoDB数据如下所示：-

      {
      "_id": 1,
      "categories":[
      {
      "categoryName": "Automobiles",
      "categoryId": 1,
      "catDisplayName": "language1",
      "subCategories": [
        {
            "subCategoryName": "cars",
            "subCategoryId": 1,
            "subCatDisplayName": "language2"
        },
        {
            "subCategoryName": "bykes",
            "subCategoryId": 2,
            "subCatDisplayName": "language3"
        }

    ]
},
{
    "categoryName": "Electronics",
    "categoryId": 2,
    "catDisplayName": "somelanguage1",
    "subCategories": [
        {
            "subCategoryName": "Mobiles",
            "subCategoryId": 1,
            "subCatDisplayName": "somelanguage2"
        },
        {
            "subCategoryName": "cameras",
            "subCategoryId": 2,
            "subCatDisplayName": "somelanguage3"
        }
       ]
      }
      ]
      }

我们正在审理MongoDb Casbah的两起案件，以下案件为：-

如果类别存在而子类别不存在，则更新子类别数组中的子类别

如果类别不存在且子类别不存在，则分别更新类别和子类别数组中的类别和子类别

我的案例1代码看起来像这样，工作正常

val builderObj = MongoDBObject.newBuilder
builderObj += "subCategoryName" -> "cycles"
builderObj += "subCategoryId" -> 3
builderObj += "subCategoryName" -> "language4"
builderObj.result ()

val query = MongoDBObject("categories.categoryName" -> "Automobiles")

val updatingdata = $addToSet("categories.$.subCategories" -> builderObj.result ())
collection.update(query,updatingdata,true,true)

但是如何为案例2写作，我们正在尝试如下

val builderObj1 = MongoDBObject.newBuilder
builderObj1 += "categoryName"-> "Entertainment"
builderObj1 += "categoryId"-> 3
builderObj1 += "catDisplayName"-> "somelanguage4"

val builderObj = MongoDBObject.newBuilder
builderObj += "subCategoryName" -> "Tickets"
builderObj += "subCatDisplayName"-> "language1"
builderObj += "subCategoryId" -> 1
builderObj.result ()

val query = MongoDBObject("categories.$.categoryName" -> "Entertainment") //Entertainment  Category doesn't exist in my data

val updatingdata = ? // How To Update the Cateroy and SubCategory at a time 
collection.update()

请给我一些建议，我在这里感到震惊

致意

---

GSY

由于您正在创建一个新类别，因此新类别的

子类别

数组将为空。因此，您可以直接将其添加到新类别中

val subCatBuilder = MongoDBObject.newBuilder
subCatBuilder += "subCategoryName" -> "Tickets"
subCatBuilder += "subCatDisplayName"-> "language1"
subCatBuilder += "subCategoryId" -> 1
subCatBuilder

val catBuilder = MongoDBObject.newBuilder
catBuilder += "categoryName"-> "Entertainment"
catBuilder += "categoryId"-> 3
catBuilder += "catDisplayName"-> "somelanguage4"
catBuilder += "subCategories" -> MongoDBList(subCatBuilder.result())

val query = MongoDBObject() // How do you know which elements of collection to update?

val updatingdata = $push("categories" -> catBuilder.result())

collection.update(query, updatingdata, true, true)

---

当然，这将更新

集合的每个元素以添加新类别。如果您想更具选择性，则需要适当地更新
查询。
因为您正在创建一个新类别，新类别的
子类别
数组将为空。因此，您可以直接将其添加到新类别中

val subCatBuilder = MongoDBObject.newBuilder
subCatBuilder += "subCategoryName" -> "Tickets"
subCatBuilder += "subCatDisplayName"-> "language1"
subCatBuilder += "subCategoryId" -> 1
subCatBuilder

val catBuilder = MongoDBObject.newBuilder
catBuilder += "categoryName"-> "Entertainment"
catBuilder += "categoryId"-> 3
catBuilder += "catDisplayName"-> "somelanguage4"
catBuilder += "subCategories" -> MongoDBList(subCatBuilder.result())

val query = MongoDBObject() // How do you know which elements of collection to update?

val updatingdata = $push("categories" -> catBuilder.result())

collection.update(query, updatingdata, true, true)

当然，这将更新
集合的每个元素以添加新类别。如果你想更具选择性，你需要适当地更新
query
。
Hi。。。。。Kong上面的代码工作正常，但我们想从电子产品类别中删除子类别（例如：-我想从mydata中删除手机）我们正在尝试的代码如下：-val removingData=$pull（MongoDBObject（“类别”->MongoDBObject（“CategorityName”->“娱乐”））此代码用于删除特定类别，但是如何从特定类别中删除一个或多个子类别。我不确定我是否完全理解您要执行的操作。也许你可以提交一个单独的问题，并进一步阐述你想做什么以及迄今为止你已经尝试了什么。嗨。。。。。Kong上面的代码工作正常，但我们想从电子产品类别中删除子类别（例如：-我想从mydata中删除手机）我们正在尝试的代码如下：-val removingData=$pull（MongoDBObject（“类别”->MongoDBObject（“CategorityName”->“娱乐”））此代码用于删除特定类别，但是如何从特定类别中删除一个或多个子类别。我不确定我是否完全理解您要执行的操作。也许你可以提交一个单独的问题，并进一步阐述你想做什么以及迄今为止你已经尝试了什么。