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index.js
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index.js
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"use strict"
const {DataTypes} = require("sequelize");
const {hooks, getDiff, defineModel} = require("./lib/Helpers");
const {isEmpty} = require('lodash')
exports.init = (sequelize) => {
return {
enableAndLoadModelTrail: function enableAndLoadModelTrail(db) {
const Revision = defineModel(sequelize, DataTypes)
db.revisions = Revision
Object.keys(db).forEach((modelName) => {
if (modelName !== "revisions"){
db[modelName].hasMany(db['revisions'], {
constraints: false,
foreignKey: "documentId",
scope: {model: modelName.toLowerCase()}
})
db['revisions'].belongsTo(db[modelName],{
constraints: false,
foreignKey: "documentId"
})
hooks.forEach((hook) => {
db[modelName].addHook(hook.name, (instance, options) => {
try{
const document = getDiff(instance._changed, instance.dataValues, instance._previousDataValues, hook.name)
if (!isEmpty(document) || hook.name === "afterDestroy"){
instance.createRevision({
document: document,
userId: options.userId,
operation: hook.event
})
}
}
catch (e) {
console.log("Error on Creating Revisions", e)
}
})
})
if (db[modelName].associate){
db[modelName].associate(db)
}
}
})
return Revision
},
};
};
module.exports = exports;