node.js - Querying Mongo Database -


i need perform query on following entry in mongo database:

 {     "_id" : objectid("597b19512a5b1c3258e6440e"),     "fdata" : [             {                     "type" : "header",                     "subtype" : "h1",                     "label" : "date of commencement"             },             {                     "type" : "paragraph",                     "subtype" : "p",                     "label" : "the partnership business shall deemed have commenced on , :"             },             {                     "type" : "date",                     "label" : "date field",                     "description" : "enter correct date per instructions in clause",                     "classname" : "form-control",                     "name" : "date-1501239537753"             },             {                     "type" : "button",                     "subtype" : "submit",                     "label" : "next",                     "classname" : "btn btn-primary",                     "name" : "button-1501239595350",                     "style" : "primary"             }     ] }

i have fetch entire array called fdata , parameter available me value of label in array called cl so:

cl = ['date of commencement'];

my question how access array entry following code gives me 'unexpected token'

my query this:(using nodejs in backend)

    for(var i=0; i<cl.length ;i++) {          var dummy = cl[i];          //console.log(dummy);          result[i] = db.collection('clauses').findone({fdata[0].label: dummy},{fdata});     }

its in loop because in cases array cl have multiple entries.

the findone query you're using asynchronous. why see [ promise { <pending> } ]. there lot of approaches handle asynchronous behavior:

  • callbacks
  • async library
  • promises
  • generators + coroutines
  • async + await

if nodejs version new enough (8+) should support async/await approach.

async function dojob(arr) {   const clauses = db.collection('clauses');    (const key of arr) {     const result = await clauses.findone({'fdata.label': key});     console.log(result);   } }

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