im just getting up to speed with the basics of elasticsearch...
indexing works fine but now that i want to do an incremental index on selected records that have changed in a set time span so i need to get the unique auto generated _id from the indexed record.
when looping through each content item i will be able to retrieve our own id field that we set within the class poco with -
var request = new GetRequest("mycontentindex", "contentindexclass", contentInsert.ESUniqueKey)
{
Fields = new PropertyPathMarker[] { "content", "name", "eSUniqueKey" }
};
what i then want to do is to get the internal metadata _id from the current record as this is the field that is used when the client.Update is done...
does anyone know how i would get this?
im working with the NEST API within .NET / C#
Related
I am two questions:
1- I want get by Id from database but operation is based on the key that is made automatically by MangoDB e.g _id. I want to search based on a field that I created myself e.g: id. for this porpouse I used following :
app.get('/:id',async(req,res)=>{
try{
const get=await product.findById({id:req.params.id});
res.json(get);
}
catch(err){
res.send(err);
}
});
and get following output:
{"stringValue":"\"{ id: '1' }\"","valueType":"Object","kind":"Number","value":{"id":"1"},"path":"_id","reason":{"generatedMessage":true,"code":"ERR_ASSERTION","actual":false,"expected":true,"operator":"=="},"name":"CastError","message":"Cast to Number failed for value \"{ id: '1' }\" (type Object) at path \"_id\" for model \"product\""}
when creating the database the fied _id is created by mongodb and know as key. What command should I use to prevent this field from being created? how do i define key field myself in database or select my own definition field as the primary key on which to search?
If you want to do that, you should use find method:
const get = await product.find({id:req.params.id});
I'm not sure, but I think that is not possible to avoid the creation of field _id in mongodb, although you can avoid the ObjectId type if you specify the field _id with a custom value (should be unique) when you insert the document.
But if you want to use a custom id value, you will need to use mongoose find method by you custom id as I indicated before. Since your custom id field should be unique you can use findOne in order to improve the performance of the query.
I'm creating a Google Keeper replica where a user can log in and the list of todo list for that user is stored.
I'm new to mongoDB, express, and react, and I was wondering how someone would go about doing this. Would you create a User Schema with the "list objects" or create a User Schema and a separate List schema.
I think the creating one schema would be more efficient, but when I go to update or delete a note, I don't know how I would target a specific note without an ID since the ID would be associated with the entire user schema.
Thank you!
You can assign an unique id to the list entries while inserting them into the database. For example, you can use timestamp. The structure of your list items will be something like-
{ itemId: "1595488458403", value: "Do the laundry" }
As the items will be created one by one, therefore, there timestamps will be different. To create the timestamp of the present time, use-- new Date().getTime()
Here's the roadmap
Bring the value of the list item from your frontend to the backend. (say, "Do the laundry")
Define a variable "itemId" in the backend route:
itemId = new Date().getTime()
While inserting the item to the user's list of to-dos, insert:
{ itemId: itemId, value: "Do the laundry" }
Is there a way to generate an ID for a new document?
Something like
var newID = mongoose.Types.ObjectId();
// some random code that may involve db operations.
db.Model.create({_id: newID, otherProperties: {}})
When I write something like this, actual ID of the created document is always slightly larger than the newID. Is there anyway to use the newID exactly?
You should not create ID attribute for mongodb documents, It will automatically generate an ID attribute to all documents when we create them.
e.x
db.users.insert({name:'kasun',email:'kasun#gmail',address:'2street,colombo'})
this will crete an attribute called _id for the document of kasun.It is unique.Therefore don't set id attribute manually.
I am currently working with the Algolia search API and I am unable to figure out how I would limit the results by key value searching + query string. By this i mean this.
I have a list of properties.
Each property belongs to a client.
Within the application If i am looking at a client information card and I want to search for a property that client owns It would make more sense to limit the results to the client and then look for the query string.
I am using MongoDB as my DB and storing the client id as a sub document like so
//Property Document
{
_id : "randomID"
client : {
_id : "randomID",
name : "ClientName"
}
}
If you want to restrict the search to a specific client, I would go for facet filtering to restrict the search to that client only.
Add client._id in the attributesForFaceting in your index settings
Filter your searches with the facetFilters=client._id:MYCLIENTID query parameter
Then, you should also take a look at the Secured API keys which are able to encode such restriction in a secure way (so the end-user cannot patch the JS code and work-around the filtering).
There is parameter called restrictSearchableAttributes[link] to restrict, at query time, search to some attributes only. Nevertheless, in your case I think you'd get more accurate results by putting each client info into a different record (+ the info of the related document).
I've never worked with a database before, but I chose Couch DB because I needed a Json database, and HTTP queries seemed kinda simple. However the documentation assumes a level of knowledge I just don't have.
Assuming I have a database called 'subjects', it seems I can access the json by using GET on
http://localhost:5984/subjects/c6604f65029f1a6a5d565da029001f4c
However beyond that I'm stuck. Ideally I want to be able to:
Access a list of all the keys in the database (not their values)
Access an individual element by its key
Do I need to use views for this? Or can I just set fields in my GET request? Can someone give me a complete example of the request they'd use? Please don't link to the CouchDB documentation, it really hasn't helped me so far.
Views can be used to fetch the data
1) In order to get all keys from the database you can use below view
function(doc) {
if (doc.type=="article")
emit(doc._id,null); //emit(key,value), if you have any other field as key then specify as doc.key e.g doc.
}
You can access this view from browser using below URL
http://<ipaddress>:<port>/databasename/_design/designdocumentname/_view/viewname
e.g :
http://<ipaddress>:<port>/article/_design/articlelist/_view/articlelist
article is the database name,articlelist is name of the design document as well as view.
2) In order to access individual document by key
Below view will return all the articles belonging to a particular department
function(doc) {
if(doc.type == 'article' ) {
emit([doc.departmentname], doc);
}
}
Query this view based on the "department name"
e.g: Get all the articles belonging to "IBU3" department
http://<ipaddress>:<port>/department/_design/categoryname/_view/categoryname?key=[%22IBU3%22]