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6f6c8f4521
refs #9178 - avoid importing 4 modules (logging, errors, events and i18n) - simply require common in each file
94 lines
4.1 KiB
JavaScript
94 lines
4.1 KiB
JavaScript
var moment = require('moment-timezone'),
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Promise = require('bluebird'),
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_ = require('lodash'),
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common = require('../../lib/common');
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module.exports = function (Bookshelf) {
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var ParentModel = Bookshelf.Model,
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Model;
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Model = Bookshelf.Model.extend({
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/**
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* Update collision protection.
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*
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* IMPORTANT NOTES:
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* The `sync` method is called for any query e.g. update, add, delete, fetch
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*
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* We had the option to override Bookshelf's `save` method, but hooking into the `sync` method gives us
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* the ability to access the `changed` object. Bookshelf already knows which attributes has changed.
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*
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* Bookshelf's timestamp function can't be overridden, as it's synchronous, there is no way to return an Error.
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*
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* If we want to enable the collision plugin for other tables, the queries might need to run in a transaction.
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* This depends on if we fetch the model before editing. Imagine two concurrent requests come in, both would fetch
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* the same current database values and both would succeed to update and override each other.
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*/
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sync: function timestamp(options) {
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var parentSync = ParentModel.prototype.sync.apply(this, arguments),
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originalUpdateSync = parentSync.update,
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self = this;
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// CASE: only enabled for posts table
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if (this.tableName !== 'posts' ||
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!self.serverData ||
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((options.method !== 'update' && options.method !== 'patch') || !options.method)
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) {
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return parentSync;
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}
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/**
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* Only hook into the update sync
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*
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* IMPORTANT NOTES:
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* Even if the client sends a different `id` property, it get's ignored by bookshelf.
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* Because you can't change the `id` of an existing post.
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*
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* HTML is always auto generated, ignore.
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*/
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parentSync.update = function update() {
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var changed = _.omit(self.changed, [
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'created_at', 'updated_at', 'author_id', 'id',
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'published_by', 'updated_by', 'html', 'plaintext'
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]),
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clientUpdatedAt = moment(self.clientData.updated_at || self.serverData.updated_at || new Date()),
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serverUpdatedAt = moment(self.serverData.updated_at || clientUpdatedAt);
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if (Object.keys(changed).length) {
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if (clientUpdatedAt.diff(serverUpdatedAt) !== 0) {
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// @TODO: Remove later. We want to figure out how many people experience the error in which context.
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return Promise.reject(new common.errors.UpdateCollisionError({
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message: 'Saving failed! Someone else is editing this post.',
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code: 'UPDATE_COLLISION',
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level: 'critical',
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context: JSON.stringify({
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clientUpdatedAt: self.clientData.updated_at,
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serverUpdatedAt: self.serverData.updated_at,
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changed: changed
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})
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}));
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}
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}
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return originalUpdateSync.apply(this, arguments);
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};
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return parentSync;
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},
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/**
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* We have to remember current server data and client data.
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* The `sync` method has no access to it.
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* `updated_at` is already set to "Date.now" when the overridden `sync.update` is called.
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* See https://github.com/tgriesser/bookshelf/blob/79c526870e618748caf94e7476a0bc796ee090a6/src/model.js#L955
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*/
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save: function save(data) {
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this.clientData = _.cloneDeep(data) || {};
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this.serverData = _.cloneDeep(this.attributes);
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return ParentModel.prototype.save.apply(this, arguments);
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}
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});
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Bookshelf.Model = Model;
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};
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