This repository contains accompanying code for the article: Efficiently paging geospatial data with MongoDB - forwards and backwards!.
You will need Node.js and MongoDB ( version 3 or greater ) to run the examples.
After cloning the repo, execute:
yarn install
or if you don't use yarn:
npm install
in the top level directory.
Before running the examples, start MongoDB:
mongod --dbpath /some/path
This will start an instance which will accept connections at the default url: mongodb://localhost:27017. If you wish to modify the connection url used by all examples, edit the ./src/helpers/with_collection.coffee file.
NOTE: running any of the examples will create a database named geo_paging_tutorial and a collection named locations ( the collection will be cleared if it exists ). You can change those in the same file as the connection url.
All files in the src folder ( apart from lib.coffee ) can be ran like so:
yarn coffee src/00_create_index.coffee
This will use the coffee binary from ./node_modules/.bin/. You can use npx instead of yarn to achieve the same result.
The functions exported in the src/lib.coffee file contain final implementation of the techniques described in the article. src/10_page_backwards_final.coffee demonstrates how to use them to page both forwards and backwards.
If you wish to compile the code do JavaScript, you can do something like:
yarn coffee -o lib -c src