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June 17, 2021 16:38
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Auto-incrementing ID's in Loopback
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| module.exports = function (Account) { | |
| Account.observe('before save', function addAccountId(ctx, next) { | |
| if (!ctx.isNewInstance) { | |
| debug('id is already set, returning', ctx.data); | |
| return next(); | |
| } | |
| app.dataSources.db.connector.collection("Sequences").findAndModify({name: 'Account'}, [['_id', 'asc']], {$inc: {value: 1}}, {new: true}, function (err, rec) { | |
| if (err) { | |
| console.err(err); | |
| } else { | |
| if (ctx.instance) { | |
| ctx.instance.id = rec.value.value; | |
| } else { | |
| ctx.data.id = rec.value.value; | |
| } | |
| } | |
| next(); | |
| }); | |
| }); | |
| } |
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| { | |
| "name": "Account", | |
| "base": "PersistedModel", | |
| "idInjection": false, | |
| "properties": { | |
| "id": { | |
| "type": "Number", | |
| "id": true, | |
| "default": 0 | |
| }, | |
| ... | |
| } | |
| } |
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| { | |
| "name": "Sequences", | |
| "base": "PersistedModel", | |
| "public": false, | |
| "idInjection": true, | |
| "options": { | |
| "validateUpsert": true | |
| }, | |
| "properties": { | |
| "name": { | |
| "type": "string" | |
| }, | |
| "value": { | |
| "type": "number", | |
| "default": 100000 | |
| } | |
| }, | |
| "validations": [], | |
| "relations": {}, | |
| "acls": [], | |
| "methods": {} | |
| } |
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How we can change the no of digit id which is already in single digit and auto increment