How to query a nested document in mongo?
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Best solution
Here is a doc I have: var docIHave = { _id: "someId", things: [ { name: "thing1", stuff: [1,2,3,4,5,6,7,8,9] }, { name: "thing2", stuff: [4,5,6,7,8,9,10,11,12,13,14] }, { name: "thing3", stuff: [1,4,6,8,11,21,23,30] } ] } This is the doc I want: var docIWant = { _id: "someId", things: [ { name: "thing1", stuff: [5,6,7,8,9] }, { name: "thing2", stuff: [5,6,7,8,9,10,11] }, { name: "thing3", stuff: [6,8,11] } ] } stuff...
Answer:
Use mongo aggregation like following : First use $unwind this will unwind stuff and then use $match...
Hans at Stack Overflow Mark as irrelevant Undo
Other solutions
i had a mongo document structured as { "id": 1, "userId": 1, "layout": 1, "snapshotDetails"â–¼: { "0": { "id": 1, "name": "jaison", ...
Answer:
If you use a ODM framework like Mongoose, you can do the query that Gaetan is suggesting and then use...
Thomas Chen at Quora Mark as irrelevant Undo
Error Stack trace: SEVERE: StandardWrapper.Throwable org.springframework.beans.factory.BeanDefinitionStoreException: IOException parsing XML document from ServletContext resource [/WEB-INF/dispatcher-servlet.xml]; nested exception is java.io...
Answer:
Try unpacking your war file to check if the file is in the WEB-INF folder. It clearly complains that...
Martin Stolz at Quora Mark as irrelevant Undo
Lets say we have Parent Document for book with it's name ISBN and short summary (and some other stuff) and child documents for chapters. I can also save "parent doc" data for every chapter as doc_values (not_analysed string) and then aggregate...
Answer:
Both solutions have different use so it's not easy to answer the question without knowing the use case...
PaweŠRóg at Quora Mark as irrelevant Undo
I am building message board type system that will have hundreds of topics. I am new to programming/databases and so far the mongo style query language clicks with me better than linking a ton of SQL tables. I'm also concerned with scaling as its become...
Answer:
MongoDB is well suited to this type of use - it's a Document Store, which is all forum posts are at...
Jeremy Wilson at Quora Mark as irrelevant Undo
I am looking to develop a simple webapp, that really relies on 3rd party API's and I can't see why I can't just query the REST endpoint, store the returning JSON into MongoDB, and then just throw that to a client-side library e.g. knockout-js. Is this...
Answer:
After attending a presentation done by Ross Lawley, I think the situation is thus: 45kb is a workable...
Sky Viker-Rumsey at Quora Mark as irrelevant Undo
What is difference between a query, sub query and a nested sub query? A query within a query is called sub query, then what is actually nested sub query and some people say that a query in WHERE clause of another sub query is called nested sub query...
Answer:
I believe your confusion may be because of lax terminology used by the SQL/database community. I will...
Alec Maddison at Quora Mark as irrelevant Undo
For example, here is the code that I am trying to implement. It works with two nested IIF statements of different format, but I get "#Error" for text format values and a date for long integer values when I add a third nested statement. Original...
Answer:
Normally you use the & or + sign to concatenate multiple columns into one field in a query. The...
Nico Altink at Quora Mark as irrelevant Undo
For example, the following nested SQL query cannot be unnested: SELECT AVG(salary) FROM ( SELECT DISTINCT department, salary FROM emp )
Answer:
Assume department1 has 10 employees with salary "$1". department2 has 25 employees with salary...
Bill Karwin at Quora Mark as irrelevant Undo
For example, the following nested SQL query cannot be unnested: SELECT AVG(salary) FROM ( SELECT DISTINCT department, salary FROM emp )
Answer:
Why couldn't it be unnested? You're getting a distinct list of department and salary, but then you're...
Grant Fritchey at Quora Mark as irrelevant Undo
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