Add models#getModel helper

It provide a utility for getting majifix module models
already registered in mongoose odm plus a check on
thrown exception to allow ignore schema not registered error

CHANGELOG.md

@@ -1,5 +1,6 @@
 # v0.3.0 / 2018-06-08
 - Expose models name as constants
+- Add get models helper
 
 # v0.1.0 / 2018-05-22
 

lib/models.js

@@ -2,8 +2,11 @@
 
 
 /* dependencies */
+const mongoose = require('mongoose');
+const { MissingSchemaError } = mongoose.Error;
 
 
+/* constants */
 Object.defineProperties(exports, {
   JURISDICTION_MODEL_NAME: {
     get: function () {
@@ -36,3 +39,28 @@ Object.defineProperties(exports, {
     }
   }
 });
+
+
+/* helpers */
+exports.getModel = function getModel(modelName) {
+
+  //try obtain model
+  try {
+    const Model = mongoose.model(modelName);
+    return Model;
+  }
+
+  //catch error
+  catch (error) {
+
+    //ignore missing schema error
+    if (!(error instanceof MissingSchemaError)) {
+      throw error;
+    }
+
+    //unknown model
+    return undefined;
+
+  }
+
+};

package.json

@@ -48,6 +48,7 @@
     "sinon-chai": "^3.0.0"
   },
   "dependencies": {
-    "lodash": "^4.17.10"
+    "lodash": "^4.17.10",
+    "mongoose": "^5.1.2"
   }
 }

test/default.models.spec.js

@@ -3,6 +3,8 @@
 
 /* dependencies */
 const path = require('path');
+const mongoose = require('mongoose');
+const { Schema } = mongoose;
 const { expect } = require('chai');
 
 
@@ -56,6 +58,23 @@ describe('default', function () {
       expect(common.models).to.be.eql(models);
     });
 
+    it('should get model', function () {
+      expect(models.getModel).to.exist;
+      expect(models.getModel).to.be.a('function');
+    });
+
+    it('should get model', function () {
+      const Any = models.getModel('Any');
+      expect(Any).to.be.undefined;
+    });
+
+    it('should get model', function () {
+      mongoose.model('Any', new Schema({ name: String }));
+      const Any = models.getModel('Any');
+      expect(Any).to.exist;
+    });
+
+
   });
 
 });