81 lines
3.3 KiB
JavaScript
81 lines
3.3 KiB
JavaScript
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import {Mongo} from "meteor/mongo";
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import { Meteor } from 'meteor/meteor';
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import { check } from 'meteor/check';
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import {SimpleSchema} from 'meteor/aldeed:simple-schema';
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Barcodes = new Mongo.Collection('Barcodes');
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// A simple mapping between a concatenation of the product & measure ID and a unique sequential number for the barcode. This allows us to have a small number to keep our barcodes simple, while maintaining the more traditional MongoDB ID's for the Product and Measure.
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const BarcodesSchema = new SimpleSchema({
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barcodeId: {
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type: Number,
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label: "Barcode ID",
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optional: false,
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index: 1,
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unique: true
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},
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productAndMeasureId: { //Just the two ids jammed together with a single space between them.
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type: String,
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label: "Product And Measure ID",
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optional: false,
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index: 1,
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unique: true
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}
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});
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if(Meteor.isServer) {
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//Meteor.publish('barcodes', function() {
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// return Barcodes.find({});
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//});
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Meteor.methods({
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getBarcodeId: function(productId, measureId) {
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check(productId, String);
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check(measureId, String);
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let hasProduct = Meteor.collections.Products.findOne({_id: productId}, {fields: {}});
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let hasMeasure = Meteor.collections.Measures.findOne({_id: measureId}, {fields: {}});
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if(hasProduct && hasMeasure) {
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let existing = Barcodes.findOne({productAndMeasureId: productId + ' ' + measureId});
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if(existing) {
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return existing.barcodeId;
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}
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else {
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let c = 0;
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//Try a thousand times before failing. Should never fail, should also not ever need to try a thousand times (unless we somehow automate label generation to the point where a 1000 processes at once are requesting labels that have never been generated before - highly unlikely).
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while(c++ < 1000) {
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//Lookup the most likely next barcode id from the db, then attempt to insert with it. If it fails due to duplication, then increment and repeat.
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let cursor = Products.find({}, {barcodeId: 1}).sort({barcodeId: -1}).limit(1); //Since currently products are never removed, we shouldn't need to detect sequence gaps and fill them in (odds are we will never use more than 10k numbers anyway).
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let barcodeId = cursor.hasNext() ? cursor.next().barcodeId + 1 : 1;
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Barcodes.insert({productAndMeasureId: productId + ' ' + measureId, barcodeId}, function(err, id) {
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if(err) console.log(err);
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else return barcodeId;
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});
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}
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//If we are still here, then there was a massive failure (c exceeded 1000).
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console.log("We failed to generate a new barcode ID 1000 times, so we are giving up. This should never happen.");
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throw new Meteor.Error(403, "Unable to generate a barcode ID.");
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}
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}
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else {
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//Cannot find either the product or the measure in the db. Cannot give an id.
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console.log("Unable to generate a barcode ID because we could not find the product " + productId + " OR we could not find the measure " + measureId);
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throw new Meteor.Error(403, "Unable to find the product or the measure. Both must exist in order to generate a barcode ID.");
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}
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},
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});
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}
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//Allows the client to do DB interaction without calling server side methods, while still retaining control over whether the user can make changes.
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Barcodes.allow({
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insert: function() {return false;},
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update: function() {return false;},
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remove: function() {return false;}
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});
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export default Barcodes;
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