Question

是否可以使用动态ID作为键来更新数据库？

假设我希望数据库看起来像这样：

- Data
     - dynamic key
         - data 1
         - data 2

该键应该在每次调用databaseRef.updateChildValues(addObject)时增大。

此外，有没有办法将var设置为键？我已经尝试过了，但是没有用：

var addId: Int = 0

func updateData() {
        ...

        addId += 1

        let addObject = [
            addId: someData
            ] as [String: Any]

        databaseRef.updateChildValues(addObject)
    }

Answer 1

您可能需要image_path = 'cats-and-dogs/train/dogs/82.jpg' image = np.expand_dims(ndimage.imread(image_path), 0)

childByAutoId()

Answer 2

密钥没有增长。这是关键。

如果这就是您的意思，则可以在该键下下添加其他子节点，但是updateChild值仅在该节点不存在时才添加其他节点。否则它将更新该节点。

此外，如果您想获取新节点的密钥，则可以这样做

buildWorkTracked(data?: ITimecardDet): FormGroup {
    // If data was provided, dynamically create the form controls stored in const
    // Provide values from data param for inputs
    if (data) {
      const buildTimecardDetsLineItem = new FormGroup({
        payCategory: new FormControl(this.buildPayCategories()),
        shiftDifferential: new FormControl(
          this.buildShiftDifferentialCategories()
        ),
        overtimeCategory: new FormControl(this.buildOvertimeCategories()),
        hoursWorked: new FormControl(data.hours),
        earnings: new FormControl({
          value: (data.baserate * data.hours).toFixed(2),
          disabled: true
        })
      });
      // Patch form array to set selected values based off of data param
      buildTimecardDetsLineItem.patchValue({
        payCategory: data.paycatinc,
        shiftDifferential: data.shiftDifferentialTypeId,
        overtimeCategory: data.overtimeTypeId
      });
      // Return const
      return buildTimecardDetsLineItem;
    } else {
      // If no data provided, create blank form array for end user entry
      return new FormGroup({
        payCategory: new FormControl(this.buildPayCategories()),
        shiftDifferential: new FormControl(
          this.buildShiftDifferentialCategories()
        ),
        overtimeCategory: new FormControl(this.buildOvertimeCategories()),
        hoursWorked: new FormControl('0:00'),
        earnings: new FormControl({ value: null, disabled: true })
      });
    }
  }

Swift和Firebase-使用动态密钥更新数据库

2 个答案: