mongodb - Mobile Meteor App - calculating nearby locations and storing as sortable collection -

-

I'm putting a mobile meteorite application that I use to use local (within 20 miles radius) features Want to I have a collection of these features, which I would like to be able to pass in my current location (using Cordova) with current lately data and generate a list (/ archive?) First of all to generate Sorted

I have two specific problems on which I get some advice!

Can I use this for Mongo's $ pass or should I use it to calculate the distance node.js add-on (like 'Geolib '-)?

How do I get a temporary (locally stored) collection of these places to display in my list? Maybe if I do not use near $ then I have to calculate the distance at all those places, and then any distance must be returned, but it is below a certain limit, but This is a costly way to do this when my location list grows and grows.

Sorry, this is the first time I have tried to do something like this;

Edit - My code (Why is not it working ?!)

I am collecting collection of such places in a collection: < / P>

Beaches.insert ({name: 'Venice Beach CA', geometry: {type: "point", coordinates: [-118.473314,118.473314]}});

Beaches._ensureIndex ({'geometry.coordinates': '2D'}, function (hey, result) {if ( Mistake) console dir (err);});

I ask these entries like this (going through lat and lng):

getNearBeaches = function (LNG, lat) { Return Beaches.find ({'geometry.coordinates': {$ near: {$ geometry: {type: "point", coordinates: [lng, lat)}}, $ maxDistance: 20000 // meter}})};

I can list my collection directly with find () but my location search returns nothing, even if I have set E $ $$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$ >

You can send the current location to not to the server and, to archive the subscription, MongoDB can be filtered by by $ < / Code>: 

  Meteor.subscribe ("Facilities", {latlng: Session.get ("latlng")});

and smth like this: 

  Meteor.publish ("utilities", function (latlng) {return features. Search (search ({location: { Near $: {$ Geometry: {Type: "Point", Coordinate: LatLng}, $ maxDistance: 20000 // Meters}}})}};

You must be Correct data type and indexed and field location (-:


Comments

Post a Comment

Popular posts from this blog

Pass DB Connection parameters to a Kettle a.k.a PDI table Input step dynamically from Excel -

-
Image
I have a requirement whenever I run my own kettle, dynamically took database connection parameters from an excel source Every run should go. I have an Excel column names: hostname, username, database, password. I want to pass these connection parameters to my table input stage dynamically whenever it runs the job. This is what I was trying to do. You can get it Connection parameters from the DB reading source (for example Excel or a CSV file in my example) < / Li> Store the parameters in the variable Using the variable in your connection's settings. Setting Variables Create another conversion for (you can not do it in the same conversion Uses): set variables element variable: The element that reads / writes your data creates a new connection and sets the connection parameter using $ {variable name_} Note that you will need to type in the field field in the field $ {password} Also keep in mind that this can be a security problem as the
Read more

multithreading - PhantomJS-Node in a for Loop -

-
I am trying to implement a screen-scraps application that opens a URL in which a parameter changes as it is for a loop: var data = [ '100', '101', '102', '103', '104']; (Var indexA = 0; indexA & lt; data.length; indexA ++) for {Phantom Generation ({'port': freeport}, function (pH) {ph.create page (function (page) {page.open ("http: //...++ data [index B] +" ... " , Status {console.log ("open site:" + data [index B], position); / * OLD * / indexB ++; page evaluation (function () {// page scrape and an object Return}, function {console.log (result.dataRequest); // here is the problem}); / * new and fixed * / indexB ++} first console Logs it: Open Site: 100 Success Opens Site: 101 Success B Ola Site: 102 Success Opening Site: 103 Success Opened Site: 104 Success Which is good. Data is verified in scrap HTML and from index to array Matches. So in page 101 I scrap '101 and retrieve' and pu
Read more

c++ - MATLAB .m file to .mex file using Matlab Compiler -

-
I know that it can speak as a very famous topic, but something that helps me with it Not found This scenario is: I have my functions function, no matter what's inside, it's a generic function that may depend on other toolboxes. Does. Has input and output; I want to generate the same myFun.mex function; : Lib myFun This way I get some new files: libmyfun.c libmyfun.dll Libmyfun.exp libmyfun.exports libmyfun .h libmyfun.lib Reading around and I think that Creating a myfun.cpp that is very famous is included: / * gateway function * / zero max function (ent NLHS, MXARRA * PLS [], int NRHS, CONST M Xeray * PHS []) Here is the Variable Deals * / / * code here * /} I have tried to do this and are called Regular of Max Generation: Max ('- v', 'myfun.cpp') But I get many errors, and I should say that my myfun.cpp copy / Paste Function is where I have a lot of doubts ... especially on input / output management. My q
Read more