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index.js
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index.js
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const {
flow,
filter,
join,
map,
mapValues,
omit,
pluck,
} = require('lodash/fp')
const temporalDefaultOptions = {
// runs the insert within the sequelize hook chain, disable
// for increased performance
blocking: true,
full: false,
}
const Temporal = (model, sequelize, temporalOptions) => {
temporalOptions = { ...temporalDefaultOptions, ...temporalOptions }
const Sequelize = sequelize.Sequelize
const historyName = model.name + 'History'
//const historyName = model.getTableName() + 'History'
//const historyName = model.options.name.singular + 'History'
const historyOwnAttrs = {
hid: {
type: Sequelize.BIGINT,
primaryKey: true,
autoIncrement: true,
unique: true,
},
archivedAt: {
type: Sequelize.DATE,
allowNull: false,
defaultValue: Sequelize.NOW,
},
}
const excludedAttributes = [
'Model',
'unique',
'primaryKey',
'autoIncrement',
'set',
'get',
'_modelAttribute'
]
const historyAttributes = {
...mapValues(v => {
v = omit(excludedAttributes)(v)
// remove the "NOW" defaultValue for the default timestamps
// we want to save them, but just a copy from our master record
if (v.fieldName == 'createdAt' || v.fieldName == 'updatedAt') {
v.type = Sequelize.DATE
}
v.allowNull = true
return v
})(model.rawAttributes),
...historyOwnAttrs,
}
const historyOwnOptions = {
timestamps: false,
}
const excludedNames = [
'name',
'tableName',
'sequelize',
'uniqueKeys',
'hasPrimaryKey',
'hooks',
'scopes',
'instanceMethods',
'defaultScope',
]
const modelOptions = omit(excludedNames)(model.options)
const historyOptions = { ...modelOptions, ...historyOwnOptions }
// We want to delete indexes that have unique constraint
const indexes = historyOptions.indexes
if (Array.isArray(indexes)) {
historyOptions.indexes = flow(
filter(idx => !idx.unique && idx.type !== 'UNIQUE'),
map(idx => ({ ...idx, name: join('_')([historyName, ...idx.fields]) }))
)(indexes)
}
const modelHistory = sequelize.define(historyName, historyAttributes, historyOptions)
// we already get the updatedAt timestamp from our models
const insertHook = (obj, options) => {
const dataValues = (!temporalOptions.full && obj._previousDataValues) || obj.dataValues
const historyRecord = modelHistory.create(dataValues, { transaction: options.transaction })
if (temporalOptions.blocking) {
return historyRecord
}
}
const insertBulkHook = (options) => {
if (!options.individualHooks) {
const queryAll = model
.findAll({ where: options.where, transaction: options.transaction })
.then((hits) => {
if (hits) {
return modelHistory.bulkCreate(pluck('dataValues')(hits), { transaction: options.transaction })
}
})
if (temporalOptions.blocking) {
return queryAll
}
}
}
// use `after` to be nonBlocking
// all hooks just create a copy
if (temporalOptions.full) {
model.addHook('afterCreate', insertHook)
model.addHook('afterUpdate', insertHook)
model.addHook('afterDestroy', insertHook)
model.addHook('afterRestore', insertHook)
} else {
model.addHook('beforeUpdate', insertHook)
model.addHook('beforeDestroy', insertHook)
}
model.addHook('beforeBulkUpdate', insertBulkHook)
model.addHook('beforeBulkDestroy', insertBulkHook)
const readOnlyHook = () => {
throw new Error("This is a read-only history database. You aren't allowed to modify it.")
}
modelHistory.addHook('beforeUpdate', readOnlyHook)
modelHistory.addHook('beforeDestroy', readOnlyHook)
return model
}
module.exports = Temporal