This hook is triggered before adding child-object data. It allows extra business actions before adding child-object data, including but not limited to intercepting the add operation.

• Intercept adding child-object data

Parameters

Parameter	Description	Type
Common parameters	See details	--
objApiName	Child object apiName	String
recordType	Child object record type	String
newData	Newly added child-object data	Object
newDataIndexs	Row IDs of the newly added child-object data	Array

Basic Example

Intercept adding child-object data

export default class Plugin {
    apply() {
        return [{
            event: 'md.add.before',
            functional: this.mdAddBefore.bind(this)
        }]
    }
  // If this is a middleware plugin in a vcrm project, swap the interaction parameter positions
   // mdAddBefore(plugin, context)
  	mdAddBefore(context, plugin) {
      return new Promise((resolve, reject) => {
        let {newData} = context;
        // If you want to modify some field values of the data being added, directly modify newData
        // newData.sex = 'xxx'
         if(newData.name === 'xxx') {
        		reject();// intercept and prevent adding
      		} else {
            resolve();// allow normal adding
          }
      	})
    }
}

Notes

1. Field values changed in this hook will also participate in subsequent calculations/UI events

After data is modified in this hook, subsequent calculations and UI events will be processed based on the updated field values.

2. In this hook, child-object data obtained through context APIs does not include the newly added data

When this hook is called, the object data has not been fully created yet, so the API cannot find the new data in the object data.