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Merge pull request #401 from anna2130/master 

Added count and aggregate operations to MongoDB In node
This commit is contained in:
Nick O'Leary 2014-09-15 09:37:56 +01:00
parent a0ac79384d bc8acd24ae
commit c4932e3cf9
2 changed files with 54 additions and 18 deletions
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22
nodes/core/storage/66-mongodb.html
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@ -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>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>Calls a MongoDB collection method based on the selected operator.</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>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,

50
nodes/core/storage/66-mongodb.js
View File

@ -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 || {};
coll.find(msg.payload,msg.projection).sort(msg.sort).limit(msg.limit).toArray(function(err, items) {
if (err) {
node.error(err);
} else {
msg.payload = items;
delete msg.projection;
delete msg.sort;
delete msg.limit;
node.send(msg);
}
});
if (node.operation === "find") {
msg.projection = msg.projection || {};
coll.find(msg.payload,msg.projection).sort(msg.sort).limit(msg.limit).toArray(function(err, items) {
if (err) {
node.error(err);
} else {
msg.payload = items;
delete msg.projection;
delete msg.sort;
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);
}
});
}
});
}
});