Cloudant Selector Query

Question

I would like to query using cloudant db using selector, for example that is shown below: user would like to have loanborrowed whose amount exceeds a number, how to access th

Answer 1

While Will's answer works, I wanted to let you know that you have other indexing options with Cloudant Query for handling arrays. This blog has the details on various tradeoffs (https://cloudant.com/blog/mango-json-vs-text-indexes/), but long story short, I think this might be the best indexing option for you:

{
  "index": {
    "fields": [
      {"name": "loansBorrowed.[].loanamount", "type": "number"}
    ]
  },
  "type": "text"
}

Unlike Will's index-everything approach, here you're only indexing a specific field, and if the field contains an array, you're also indexing every element in the array. Particularly for "type": "text" indexes on large datasets, specifying a field to index will save you index-build time and storage space. Note that text indexes that specify a field must use the following form in the "fields": field: {"name": "fieldname", "type": "boolean,number, or string"}

So then the corresponding Cloudant Query "selector": statement would be this:

{
  "selector": {
    "loansBorrowed": {"$elemMatch": {"loanamount": {"$gt": 4000}}}
  },
  "fields": [
    "_id",
    "userprofile.name",
    "loansBorrowed"
  ]
}

Also note that you don't have to include "fields": as part of your "selector": statement, but I did here to only project certain parts of the JSON. If you omit it from your "selector": statement, the entire document will be returned.