70 lines
1.7 KiB
JavaScript
70 lines
1.7 KiB
JavaScript
/**
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* Module Dependencies.
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*/
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var assert = require('assert');
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/**
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* Checkpoint list entry.
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*
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* @property id {Number} the sequencial identifier of a checkpoint
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* @property time {Number} the time when the checkpoint was created
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* @property sourceId {String} the source identifier
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*
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* @class Checkpoint
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* @inherits {PersistedModel}
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*/
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module.exports = function(Checkpoint) {
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// Workaround for https://github.com/strongloop/loopback/issues/292
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Checkpoint.definition.rawProperties.time.default =
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Checkpoint.definition.properties.time.default = function() {
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return new Date();
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};
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/**
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* Get the current checkpoint id
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* @callback {Function} callback
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* @param {Error} err
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* @param {Number} checkpointId The current checkpoint id
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*/
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Checkpoint.current = function(cb) {
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var Checkpoint = this;
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this.find({
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limit: 1,
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order: 'seq DESC'
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}, function(err, checkpoints) {
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if (err) return cb(err);
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var checkpoint = checkpoints[0];
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if (checkpoint) {
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cb(null, checkpoint.seq);
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} else {
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Checkpoint.create({ seq: 1 }, function(err, checkpoint) {
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if (err) return cb(err);
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cb(null, checkpoint.seq);
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});
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}
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});
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};
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Checkpoint.observe('before save', function(ctx, next) {
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if (!ctx.instance) {
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// Example: Checkpoint.updateAll() and Checkpoint.updateOrCreate()
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return next(new Error('Checkpoint does not support partial updates.'));
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}
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var model = ctx.instance;
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if (!model.getId() && model.seq === undefined) {
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model.constructor.current(function(err, seq) {
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if (err) return next(err);
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model.seq = seq + 1;
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next();
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});
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} else {
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next();
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}
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});
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};
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