models: move Checkpoint LDL def into a json file

common/models/checkpoint.js

@@ -2,27 +2,7 @@
  * Module Dependencies.
  */
 
-var PersistedModel = require('../../lib/loopback').PersistedModel
+var assert = require('assert');
-  , loopback = require('../../lib/loopback')
-  , assert = require('assert');
-
-/**
- * Properties
- */
-
-var properties = {
-  seq: {type: Number},
-  time: {type: Date, default: Date},
-  sourceId: {type: String}
-};
-
-/**
- * Options
- */
-
-var options = {
-
-};
 
 /**
  * Checkpoint list entry.
@@ -31,47 +11,53 @@ var options = {
  * @property time {Number} the time when the checkpoint was created
  * @property sourceId {String}  the source identifier
  *
- * @class
+ * @class Checkpoint
  * @inherits {PersistedModel}
  */
 
-var Checkpoint = module.exports = PersistedModel.extend('Checkpoint', properties, options);
+module.exports = function(Checkpoint) {
 
-/**
+  // Workaround for https://github.com/strongloop/loopback/issues/292
- * Get the current checkpoint id
+  Checkpoint.definition.rawProperties.time.default =
- * @callback {Function} callback
+    Checkpoint.definition.properties.time.default = function() {
- * @param {Error} err
+      return new Date();
- * @param {Number} checkpointId The current checkpoint id
+    };
- */
 
-Checkpoint.current = function(cb) {
+  /**
-  var Checkpoint = this;
+   * Get the current checkpoint id
-  this.find({
+   * @callback {Function} callback
-    limit: 1,
+   * @param {Error} err
-    order: 'seq DESC'
+   * @param {Number} checkpointId The current checkpoint id
-  }, function(err, checkpoints) {
+   */
-    if(err) return cb(err);
+
-    var checkpoint = checkpoints[0];
+  Checkpoint.current = function(cb) {
-    if(checkpoint) {
+    var Checkpoint = this;
-      cb(null, checkpoint.seq);
+    this.find({
-    } else {
+      limit: 1,
-      Checkpoint.create({seq: 0}, function(err, checkpoint) {
+      order: 'seq DESC'
-        if(err) return cb(err);
+    }, function(err, checkpoints) {
+      if (err) return cb(err);
+      var checkpoint = checkpoints[0];
+      if (checkpoint) {
         cb(null, checkpoint.seq);
-      });
+      } else {
-    }
+        Checkpoint.create({seq: 0}, function(err, checkpoint) {
-  });
+          if (err) return cb(err);
-}
+          cb(null, checkpoint.seq);
-
+        });
-Checkpoint.beforeSave = function(next, model) {
+      }
-  if(!model.getId() && model.seq === undefined) {
-    model.constructor.current(function(err, seq) {
-      if(err) return next(err);
-      model.seq = seq + 1;
-      next();
     });
-  } else {
-    next();
   }
-}
 
+  Checkpoint.beforeSave = function(next, model) {
+    if (!model.getId() && model.seq === undefined) {
+      model.constructor.current(function(err, seq) {
+        if (err) return next(err);
+        model.seq = seq + 1;
+        next();
+      });
+    } else {
+      next();
+    }
+  }
+};

common/models/checkpoint.json

@@ -0,0 +1,14 @@
+{
+  "name": "Checkpoint",
+  "properties": {
+    "seq": {
+      "type": "number"
+    },
+    "time": {
+      "type": "date"
+    },
+    "sourceId": {
+      "type": "string"
+    }
+  }
+}

lib/builtin-models.js

@@ -34,7 +34,10 @@ module.exports = function(loopback) {
     require('../common/models/user.js'));
 
   loopback.Change = require('../common/models/change');
-  loopback.Checkpoint = require('../common/models/checkpoint');
+
+  loopback.Checkpoint = createModel(
+    require('../common/models/checkpoint.json'),
+    require('../common/models/checkpoint.js'));
 
   /*!
    * Automatically attach these models to dataSources