使用Firebase实时数据库进行一对多关系查询

Question

当前，我正在使用带Firebase实时数据库的应用程序。在数据库中，它们是客户和工作对象。我当前数据的结构如下所示。我想按客户的要求进行过滤。我必须在firebase中执行哪种查询？

+--customers
  |
  +-- customerKey1
  |  |
  |  +-- <customerData1> ..
  |  
  +-- customerKey2
     |
     +-- <customerData2>..

+--works
  |
  +-- workKey1
  |  |
  |  +-- customerKey : customerKey2  // this work belongs to customer2
  |  |
  |  +-- <the rest of work1 data
  |  
  +-- workKey2
  |  |
  |  +-- customerKey : customerKey2  // this work belongs to customer2
  |  |
  |  +-- <the rest of work2 data
  |  
  +-- workKey3
  |  |
  |  +-- customerKey : customerKey1  // this work belongs to customer1
  |  |
  |  +-- <the rest of work3 data
  |  
  +-- workKey4
     |
     +-- customerKey : customerKey1  // this work belongs to customer1
     |
     +-- <the rest of work4 data

Answer 1

要获取特定客户的works节点，请使用Firebase查询：

firebase.database().ref('works').orderBy('customerKey').equalTo('customerKey2')

有关更多信息，请参见Firebase documentation on sorting and filtering lists of data。