As i am new to Node js ,could anyone please help me to provide procedure to find number of documents in a view of couchdb using nano.
for example , I have view '_design/settings/_view/settings' in couch db .Using nano i want to find no of documents present in this view.
When you query a view using nano, provide empty arrays for startkey and endkey parameters. This will return all the results in the view.The response will contain a total_rows variable which is the total number of results.
Related
HI I'm new to cloudant (and couch and asking questions on stackoverflow so I hope I manage to be vaguely clear about what I'm asking ) and I'm trying to do probably the second most basic geo task but am hitting a dead end.
I've got a database of docs which are geojson objects, I've created an index so I can query for intersections etc but it seems the only options I have in the url is the format=legacy (gives me the ids) and the format=geojson and the include_docs parameter - what I'd like to do is give back a particular view of the result set - I'm not interested in the geometry of the object (which is a big lump of data and it's likely that a number of other properties may be in the document that I'd rather filter out)
is there a correct way to do this in a single api call or do I need to fetch the doc ids (legacy format) and then issue a second query to bring back my chosen 'view' for each document id given in the result of format=legacy response
Thanks
I'm making a NodeJS Express MongoDB app with the database of various books.
I have a list of books with information like Book Name, Author name, ISBN and so on.
View of the list here
I want to create a query function such that the page finds for relevant fields as I type along in the search text field.
Any suggestions how to implement it?
If you want to make text queries you can use the $text index on mongodb, and index the fields you need. this will allow you to search the text on all indexed fields.
you can read more about that here: https://docs.mongodb.com/manual/reference/operator/query/text/
I am doing a query with solr where I need to find documents without a given field say 'name' and I am trying following part;
$q=+status:active -name:["" TO *]'
But it sends both all the documents with and without that field.
Can anyone help me figure this out?
the field name is a normal String type and is indexed.
I am using nodejs. Can anyone help me with this
According to docs:
-field:[* TO *] finds all documents without a value for field
Update
I tried it but it sends even the ones with the field non empty
Then my wild quess is that you are using search query q instead of using filter query fq. Since you are using multiple statements in query I assume that q does some extra magic to get the most relevant documents for you, which can lead to returning some non-wanted results.
If you want to get the strict set of results you should use filter query fq instead, see docs.
In past with my PHP / Rails - MYSQL apps I've used the unique ID of a table record to keep track of a record in an html file.
So I'd keep track of how to delete a record shown like this (15 being the ID of the record):
Delete this record
So now I'm using MongoDB. I've tried the same method but the objectID ._id attribute seems to be a loooong byte string that I can't use conveniently.
What's the most sensible way of binding a link in the view to a record (for deletion, or other purposes or whatever)?
If the answer is to create a new id that's unique for each document in the collection, then what's the best way to generate those unique id's?
Thank you.
You could use a counter instead of the ObjectID
But this could create a problem when inserting a new document after you deleted a previous one.
See this blog post for more detail info on Sequential unique identifiers with Node.js and MongoDB.
Or you could use the timestamp part of the ObjectID:
objectId.getTimestamp().toString()
See the node objectid docs
How to get Post with Comments Count in single query with CouchDB?
I can use map-reduce to build standalone view [{key: post_id, value: comments_count}] but then I had to hit DB twice - one query to get the post, another to get comments_count.
There's also another way (Rails does this) - count comments manually, on the application server and save it in comment_count attribute of the post. But then we need to update the whole post document every time a new comment added or deleted.
It seems to me that CouchDB is not tuned for such a way, unlike RDBMS when we can update only the comment_count attribute in CouchDB we are forced to update the whole post document.
Maybe there's another way to do it?
Thanks.
The view's return json includes the document count as 'total_rows', so you don't need to compute anything yourself, just emit all the documents you want counted.
{"total_rows":3,"offset":0,"rows":[
{"id":...,"key":...,value:doc1},
{"id":...,"key":...,value:doc2},
{"id":...,"key":...,value:doc3}]
}