Save will update an existing object or insert a new object if one does not already exist.
Insert will insert a new object.
Save and insert either store msg or msg.payload.
Update will modify an existing object or objects. The query to select objects to update uses msg.query
+
Update will modify an existing object or objects. The query to select objects to update uses msg.query,
and the update to the element uses msg.payload. If msg.query._id is
a valid mongo ObjectId string it will be converted to an ObjectId type.
Update can add a object if it does not exist or update multiple objects.
+Update can add an object if it does not exist or update multiple objects.
Remove will remove objects that match the query passed in on msg.payload. A blank query will delete
all of the objects in the collection.
You can either set the collection method in the node config or on msg.collection. Setting it in the
node will override msg.collection.
By default MongoDB creates an _id property as the primary key - so repeated injections of the +
By default, MongoDB creates an _id property as the primary key, so repeated injections of the
same msg will result in many database entries.
If this is NOT the desired behaviour - ie. you want repeated entries to overwrite, then you must set +
If this is NOT the desired behaviour, i.e., you want repeated entries to overwrite, then you must set
the msg._id property to be a constant by the use of a previous function node.
This could be a unique constant or you could create one based on some other msg property.
-Currently we do not limit or cap the collection size at all... this may well change.
+Currently we do not limit or cap the collection size, however this may well change.