Added count and aggregate operations to MongoDB In node

nodes/core/storage/66-mongodb.html

@@ -69,7 +69,7 @@
         <label for="node-input-collection"><i class="fa fa-briefcase"></i> Collection</label>
         <input type="text" id="node-input-collection" placeholder="collection">
     </div>
-        <div class="form-row">
+    <div class="form-row">
         <label for="node-input-operation"><i class="fa fa-wrench"></i> Operation</label>
         <select type="text" id="node-input-operation" style="display: inline-block; vertical-align: top;">
             <option value="store">save</option>
@@ -141,6 +141,14 @@
         <label for="node-input-collection"><i class="fa fa-briefcase"></i> Collection</label>
         <input type="text" id="node-input-collection" placeholder="collection">
     </div>
+    <div class="form-row">
+        <label for="node-input-operation"><i class="fa fa-wrench"></i> Operation</label>
+        <select type="text" id="node-input-operation" style="display: inline-block; vertical-align: top;">
+            <option value="find">find</option>
+            <option value="count">count</option>
+            <option value="aggregate">aggregate</option>
+        </select>
+    </div>
     <div class="form-row">
         <label for="node-input-name"><i class="fa fa-tag"></i> Name</label>
         <input type="text" id="node-input-name" placeholder="Name">
@@ -148,9 +156,12 @@
 </script>
 
 <script type="text/x-red" data-help-name="mongodb in">
-    <p>Queries a MongoDB collection by using the <b>msg.payload</b> to be a MongoDB query statement as per the .find() function.</p>
+    <p>Calls a MongoDB collection method based on the selected operator.</p>
-    <p>You may also (via a function) set a <b>msg.projection</b> object to constrain the returned fields, a <b>msg.sort</b> object and a <b>msg.limit</b> object.</p>
+    <p>Find queries a collection using the <b>msg.payload</b> as the query statement as per the .find() function. Optionally, you may also (via a function) set a <b>msg.projection</b> object to constrain the returned fields, a <b>msg.sort</b> object and a <b>msg.limit</b> object.</p>
-    <p>All are optional - see the <a href="http://docs.mongodb.org/manual/reference/method/db.collection.find/" target="new"><i>MongoDB find docs</i></a> for examples.</p>
+    <p>Count returns a count of the number of documents in a collection or matching a query using the <b>msg.payload</b> as the query statement.</p>
+    <p>Aggregate provides access to the aggregation pipeline using the <b>msg.payload</b> as the pipeline array.</p>
+    <p>See the <a href="http://docs.mongodb.org/manual/reference/method/db.collection.find/" target="new"><i>MongoDB collection methods docs</i></a> for examples.</p>
+    <p>The result is returned in <b>msg.payload</b>.</p>
 </script>
 
 <script type="text/javascript">
@@ -160,7 +171,8 @@
         defaults: {
             mongodb: { type:"mongodb",required:true},
             name: {value:""},
-            collection: {value:"",required:true}
+            collection: {value:"",required:true},
+            operation: {value:"find"}
         },
         inputs:1,
         outputs:1,

nodes/core/storage/66-mongodb.js

@@ -41,7 +41,7 @@ module.exports = function(RED) {
             password: {type: "password"}
         }
     });
-    
+
     function MongoOutNode(n) {
         RED.nodes.createNode(this,n);
         this.collection = n.collection;
@@ -109,6 +109,7 @@ module.exports = function(RED) {
         RED.nodes.createNode(this,n);
         this.collection = n.collection;
         this.mongodb = n.mongodb;
+        this.operation = n.operation || "find";
         this.mongoConfig = RED.nodes.getNode(this.mongodb);
 
         if (this.mongoConfig) {
@@ -120,18 +121,41 @@ module.exports = function(RED) {
                     node.clientDb = db;
                     var coll = db.collection(node.collection);
                     node.on("input",function(msg) {
-                        msg.projection = msg.projection || {};
+                        if (node.operation === "find") {
-                        coll.find(msg.payload,msg.projection).sort(msg.sort).limit(msg.limit).toArray(function(err, items) {
+                            msg.projection = msg.projection || {};
-                            if (err) {
+                            coll.find(msg.payload,msg.projection).sort(msg.sort).limit(msg.limit).toArray(function(err, items) {
-                                node.error(err);
+                                if (err) {
-                            } else {
+                                    node.error(err);
-                                msg.payload = items;
+                                } else {
-                                delete msg.projection;
+                                    msg.payload = items;
-                                delete msg.sort;
+                                    delete msg.projection;
-                                delete msg.limit;
+                                    delete msg.sort;
-                                node.send(msg);
+                                    delete msg.limit;
-                            }
+                                    node.send(msg);
-                        });
+                                }
+                            });
+                        }
+                        else if (node.operation === "count") {
+                            coll.count(msg.payload, function(err, count) {
+                                if (err) {
+                                    node.error(err);
+                                } else {
+                                    msg.payload = count;
+                                    node.send(msg);
+                                }
+                            });
+                        }
+                        else if (node.operation === "aggregate") {
+                            msg.payload = (msg.payload instanceof Array) ? msg.payload : [];
+                            coll.aggregate(msg.payload, function(err, result) {
+                                if (err) {
+                                    node.error(err);
+                                } else {
+                                    msg.payload = result;
+                                    node.send(msg);
+                                }
+                            });
+                        }
                     });
                 }
             });

red/util.js

@@ -25,7 +25,19 @@ function ensureString(o) {
     return ""+o;
 }
 
+function ensureBuffer(o) {
+    if (Buffer.isBuffer(o)) {
+        return o;
+    } else if (typeof o === "object") {
+        o = JSON.stringify(o);
+    } else if (typeof o !== "string") {
+        o = ""+o;
+    }
+    return new Buffer(o);
+}
+
 module.exports = {
     ensureString: ensureString,
+    ensureBuffer: ensureBuffer,
 };
 

test/red/util_spec.js

@@ -37,5 +37,34 @@ describe("red/util", function() {
             s.should.equal('123');
         });
     });
+
+    describe('ensureBuffer', function() {
+        it('Buffers are preserved', function() {
+            var b = new Buffer('');
+            util.ensureBuffer(b).should.equal(b);
+        });
+        it('string is converted', function() {
+            var b = util.ensureBuffer('foo');
+            var expected = new Buffer('foo');
+            for (var i = 0; i < expected.length; i++) {
+                b[i].should.equal(expected[i]);
+            }
+            Buffer.isBuffer(b).should.equal(true);
+        });
+        it('Object is converted to JSON', function() {
+            var obj = {foo: "bar"}
+            var b = util.ensureBuffer(obj);
+            Buffer.isBuffer(b).should.equal(true);
+            should.deepEqual(JSON.parse(b), obj);
+        });
+        it('stringifies other things', function() {
+            var b = util.ensureBuffer(123);
+            Buffer.isBuffer(b).should.equal(true);
+            var expected = new Buffer('123');
+            for (var i = 0; i < expected.length; i++) {
+                b[i].should.equal(expected[i]);
+            }
+        });
+    });
 });