I am using http-source, mongo channel and NGSI mongosink for fiware cygnus. I want to avoid slash(/) in the collection name in mongodb. Is it possible by changing any fields of the configuration files? Please let me know.
Thanks in advance for all the support.
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I am new in moleculer framework.
I want to store the data in mongoDB which received from moleculer framework.
In sort i want to MongoDB instead of moleculer-db it is possible ?
Please help me.
Thanks.
If you don't want to use moleculer-db then you need to write the connection logic and the actions yourself.
In order to establish the connection with the DB you need to use lifecycle events. Take a look at this example. Instead of DB connection it creates an HTTP server but the logic is the same. After that, just write your actions
We're experimenting with storing data to a MongoDB by using node-red. As it is now, we can store data on the database, but it seems like only the 'msg.payload' is stored (as document) - and not the whole msg object. Which confuses us a little...
The flow is very simple and nothing much has really been done.
We actually dont need ALL data, but we wish to store payload but also metadata as a document to our collection on our database. We've tried searching for an answer to this, but couldn't find anything relevant on how to do this. Hopefully we can get some help on this forum.
Thanks in advance! (btw. we're using mongodb3 on node-red to store data)
The node you are using is working as intended.
The normal pattern for Node-RED is that the focus of any given node is the msg.payload entry, any other msg properties are considered to be meta data.
The simplest thing here would be to use the built in core change node to move the other fields you are interested in to be properties of the msg.payload object.
I have an instance of Raven Db at localhost:8081. I made sure to change raven's config file to allow anonymous access. I created a database named AT. Inside AT I have a collection named Admins. Inside of Admins I have two documents. I'm trying to retrieve some data via Rest using RestClient. I try to hit the db using:
http://localhost:8081/docs/admins/7cb95e9a (last bit is the id of the document I want).
and
http://localhost:8081/docs/at/admins/7cb95e9a.
With both I receive a 404. I'm not sure what I'm missing here. Can someone point me in the right direction?
The URL has the following format:
http://localhost:8081/databases/{{database-name}}/docs/{{document-id}}.
Collection is a virtual thing. get a document only by its ID, there no nothing on collection here. The document ID can be anything you set, but if you let RavenDB to generate it, it will probably be admins/1.
I'm looking for a recommendation on how best to implement MongoDB foreign key ObjectId fields. There seem to be two possible options, either containing the nested _id field or without.
Take a look at the fkUid field below.
{'_id':ObjectId('4ee12488f047051590000000'), 'fkUid':{'_id':ObjectId('4ee12488f047051590000001')} }
OR
{'_id':ObjectId('4ee12488f047051590000000'), 'fkUid':ObjectId('4ee12488f047051590000001')} }
Any recommendations would be much appreciated.
I'm having a hard time coming up with any possible advantages for putting an extra field "layer" in there, so I would personally just store the ObjectId directly in fkUid.
I suggest to use default dbref implementation, that is described here http://www.mongodb.org/display/DOCS/Database+References and is compatible with most of specific language drivers.
If your question is about the naming of the field (what you have in the title), usually the convention is to name it after the object to which it refers.
The both ways that you have mentioned are one of the same meaning. But they have different kind of usages.
Storing fkUid like 'fkUid':{'_id':ObjectId('4ee12488f047051590000001')} an object has it's own pros. Let me give an example, Suppose there is a website where users can post images and view images posted by other users as well. But when showing the image the website also shows the name/username of the user. By using this way you also can store the details like 'fkUid':{'_id':ObjectId('4ee12488f047051590000001'), username: 'SOME_X'}. When you are getting details from the db you don't have to send a request again to get the username for the specific _id.
Where as in the second way 'fkUid':ObjectId('4ee12488f047051590000001')} } you have to send another request to the server only for getting the name/username and nothing else is useful from the same object.
This is for people with knowledge on REST and Neo4j.
Is it possible to name a node before creating it in Neo4j ?
Typical Restful thing, you create a URI "XXX/db/data/node/mynode" and you want to create a node with this identifier if it is not existent in the moment.
For all that I have been researching (and testing) to the present moment, the answer is : "no it is not possible, neo4j will just always automatically give ids to the created nodes and the attempt to do create a URI and use POST to cause its creation will result in 405"
Thanks in advance.
That's correct, you can't set the id of a node. What you can do is to add some other kind of id as a property, see create node with properties. Just make sure it's indexed automatically and then you can query that index for exact matches.