Salesforce DX Developer Guide

How Salesforce Developer Experience Changes the Way You Work
Enable Dev Hub Features in Your Org
Project Setup
Authorization
Metadata Coverage
Scratch Orgs
Sandboxes
Development
Develop Against Any Org
Assign a Permission Set
Ways to Add Data to Your Org
Create Lightning Apps and Aura Components
Create Lightning Web Components
Create an Apex Class
Create an Apex Trigger
Testing
View Apex Debug Logs
Apex Debugger
Build and Release Your App
First-Generation Managed Packages
Second-Generation Managed Packages
Unlocked Packages
Continuous Integration
Troubleshoot Salesforce DX
Limitations for Salesforce DX
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Create an Apex Trigger

Use Apex triggers to perform custom actions before or after a change to a Salesforce record, such as an insertion, update, or deletion. You can create Apex triggers from the CLI.
  1. If the triggers directory doesn’t exist in <app-dir>/main/default, create it.
  2. Generate skeleton trigger files by executing force:apex:trigger:create.
    • Use the -s parameter to specify the sObject associated with this trigger, such as Account.
    • Use the -e parameter to specify the triggering events, such as before delete or after insert.
    • Specify that the command generate its output into the triggers directory with the -d parameter.

    The command generates two files.

    • mytrigger.trigger-meta.xml—metadata format
    • mytrigger.trigger—Apex source file
  3. Update the generated Apex and metadata format file with your code.