fix(find): use fields instead of projection for mongodb driver 2.x

Author: vkarpov15

lib/collection.js

@@ -6,9 +6,10 @@ const debug = require('debug')('monogram:collection');
 const find = require('./find');
 
 class Collection {
-  constructor(collection, archetype) {
+  constructor(collection, archetype, options) {
     this._collection = collection;
     this.collection = collection.s.name;
+    this.options = options || {};
     if (archetype) {
       this._archetype = archetype;
     } else {

lib/database.js

@@ -22,7 +22,7 @@ class Database {
     if (this.collections[name]) {
       return this.collections[name];
     }
-    this.collections[name] = new Collection(this.db.collection(name), archetype);
+    this.collections[name] = new Collection(this.db.collection(name), archetype, { isMongoDBDriver3: this.client != null });
     return this.collections[name];
   }
 

lib/find.js

@@ -22,8 +22,9 @@ module.exports = collection => {
       if (chained.name === 'cursor' && chained.params.length === 0) {
         return;
       }
-      // Special case, `project()` sets `projection` option
-      const name = chained.name === 'project' ? 'projection' : chained.name;
+      // Special case, `project()` sets `projection` option or `fields` depending on driver version
+      const projectionOption = collection.options.isMongoDBDriver3 ? 'projection' : 'fields';
+      const name = chained.name === 'project' ? projectionOption : chained.name;
       action.params[1][name] = chained.params[0];
     });
     return action;