Here I am trying to find all those documents having searched string in cui_str of either population_mesh or intervention_mesh or outcome_mesh
I am using $or property to find from three different fields. I am using below query from nodejs to fetch from mongodb.
exports.searchQuery= (req,res) => {
const picoSearch = req.query.text
Pico_tests.find({$or : [{"population_mesh.cui_str" : {$regex: `${picoSearch}`,$options: '$i'}},{"intervention_mesh.cui_str" : {$regex: `${picoSearch}`,$options: '$i'}},
{"outcomes_mesh.cui_str" : {$regex: `${picoSearch}`,$options: '$i'}}]}).then((data)=>{
res.send(data)
})
// Here i am searching in three different fields but is fetching all the documents irrespective of any string searched.
}
But in the result I am getting all the documents rather than specific documents containing that string. I have check a lot of time in database that given string(i.e Patient) searched but I got all the documents rather than specific one.
It was very silly mistake of spell which make all docs get fetched.
Related
I have an index that returns something like this
Company_All {
name : string;
id : string;
agentDocumentId : string
}
is it possible to load the related agent document and then generate a nested result with selectFields and QueryData like this
ICompanyView {
companyName : 'Warner',
user {
documentId : 'A/1'
firstName : 'john',
lastName : 'paul'
}
}
I need something like the below query that obviously doesn't work as I expect:
const queryData = new QueryData(
["name", "agentDocumentId", "agent.firstName", "agent.lastName"],
["companyName", "user.documentId", "user.lastName", "user.firstName"]);
return await session.query<Company_AllResult>({ index: Company_All })
.whereEquals("companyId", request.companyId)
.include(`agents/${agentDocumentId}`) // ????
.selectFields(queryData,ICompanyView)
.single();
Yes, you can do that using:
https://ravendb.net/docs/article-page/5.4/nodejs/indexes/indexing-related-documents
This is called indexing related documents, and is accessible at indexing time, not query time.
Alternatively, you have the filter clause, which has access to the loaded document, but I wouldn't generally recommend doing this.
Generally:
When you query an index, the results of querying the index are the documents from the collection the index was defined on.
Index-fields defined in the index are used to filter the index-query
but the results are still documents from the original collection.
If you define an index that indexes content from a related-document then when making an index-query you can filter the documents by the indexed-fields from the related documents, but the results are still documents from the original collection.
When making an index-query (or any other query) you can project the query results so that Not the full documents of the original collection are returned but some other object.
Now:
To project/get data from the indexed related-document you have 2 options:
Store the index-fields from the related-document in the index.
(Store all -or- specific fields).
This way you have access to that content when making a projection in your query.
See this code sample.
Don't store the index-fields from the related-document,
then you will be able to use the index-fields to filter by in your query,
but to get content you will need to use 'include' feature in your query,
and then use the session.load, which will Not make another trip to the server.
i.e. https://demo.ravendb.net/demos/nodejs/related-documents/query-related-documents
I have data that looks like this in my mongoDB atlas database:
object: {
keywords: ['Homelessness', 'Food', 'Poverty']
}
I'm creating a filtering component for my MERN stack website and wanted to add a search feature for keywords like these that are present in each object in the database. If a search query was Homelessness for example, then the object above would show up since it has Homelessness as one of its keywords. But say for example I enter Homeless as a search query, the ones with Homelessness won't pop up because Homeless =/= Homelessness. Is there a way to somehow find if the search query is within a string inside an array which is all inside a json object?
Here is what I tried so far which gets the result I described in the situation above:
const getFilteredProjects = async (req, res) => {
// Initializing request object that will be sent to retrieve DB information
var request = {}
if (req.query.keywords !== '') {
request["keywords"] = req.query.keywords
}
console.log(request)
const projects = await Project.find(request).sort({ assignment_type: 1 })
res.status(200).json(projects)
}
How can I somehow access each string inside the keywords array and see if the search query is present in it? Is that possible with mongodb or would I have to somehow do it through javascript? If that's the case I'm not sure how I could do that, I would appreciate it if I could get some help.
I need to get data from MongoDB that is first narrowed by one initial category, say '{clothing : pants}' and then a subsequent search for pants of a specific size, using an array like sizes = ['s','lg','6', '12'].
I need to return all of the results where 'pants' matches those 'sizes'.
I've started a search with:
Product.find({$and:[{categories:req.body.category, size:{$in:req.body.sizes}}]},
function(err, products) {
if (err) { console.log(err); }
return res.send(products)
});
I really don't know where to go from there. I've been all over the Mongoose docs.
Some direction would be very helpful.
The mongoose queries can receive object like Mongodb would. So you can pass the search parameters separated by ,
Product.find({categories:req.body.category, size:{$in:['s','lg','6', '12']}})
For more information on $in, check here
For more information on $and operator, check here (note we can ommit the $and operator in some cases and that is what I did)
I am new to node (v0.10) stack.
I am trying to achieve the following:
I have (hopefully) multilingual articles in the latest MongoDB such as:
_id
...more fields...
text: [
{lang: 'en', title: 'some title', body: 'body', slug: 'slug'},
....
]
Everytime I display an article in specific language I query as follows:
var query = Model.findOne({'text.slug': slug});
query.exec(function(err, doc){
async.each(doc.text, function(item, callback){
if (item.lang == articleLang) {
//populate the article to display
}
});
res.render('view', {post:articleToDisplay});
});
Slug is unique for each language!
The problem I have is that mongo will return the whole doc with all subdocs and not just the subdoc I searched for. Now I have to choose to iterate over all subdocs and display the appropriate one on client side or use async.each on the server to get the subdoc I need and only send to the views that one. I am doing it with async on the server. Is that OK? Also async iterates asynchronously but node still waits for the whole loop to finish and then renders the view. Am I missing anything thinking that the user is actually blocked until the async.each finishes? I am still trying to wrap my head around this asynchronous execution. Is there a way I can possibly improve how I manage this code? It seems to be quite standard procedure with subdocs!
Thanks in advance for all your help.
To achieve what you want, you need to make use of the aggregation pipeline. Using a simple findOne() would not be of help,
since you would then have to redact sub documents in your code rather than allowing mongodb to do it. find() and findOne() return the whole document when
a document matches the search criteria.
In the aggregation pipleline you could use the $unwind and $match operators to achieve this.
$unwind:
Deconstructs an array field from the input documents to output a
document for each element. Each output document is the input document
with the value of the array field replaced by the element.
First unwind the document based on the text values array.
$match:
Filters the documents to pass only the documents that match the
specified condition(s) to the next pipeline stage.
Then use the $match operator to match the appropriate documents.
db.Model.aggregate([
{$unwind:"$text"},
{$match:{"text.slug":slug,"text.lang":articleLang}}
])
Doing this would return you only one document with its text field containing only one object. such as: (Note that the text field in the output is not an array)
{ "_id" : ... ,.., "text" : { "slug" : "slug", "lang" : "en" ,...} }
How do you increment multiple fields in one query in mongoose?
For example, here is the working mongo query that I want to use with a mongoose model.
db.users.update({ userId:89 }, { $inc : { "subjectResults.attempts" : 1, "subjectResults.total_time" : 10, "subjectResults.total_score" : 100 } })
The above query is working in plain vanilla Mongo.
Edit: I have removed the confusing property name that lead to the comments below.
The APIs are nearly identical. Instead of db.users.update in straight mongodb, it's UserModel.update in mongoose. Pass in the exact same query and update options object.