# db.command.push
Update command. Appends one or more values to the end of an array when the value of a field is the array. Alternatively, if the value of a field is empty, creates the field and sets the array as the incoming value.
Function signature:
function push(values: any[]): Command
Sample code
const cloud = require('wx-server-sdk')
cloud.init()
const db = cloud.database()
const _ = db.command
exports.main = async (event, context) => {
try {
return await db.collection('todos').doc('doc-id').update({
data: {
tags: _.push(['mini-program', 'cloud'])
}
})
} catch(e) {
console.error(e)
}
}