How to use knexjs globally in a sails js application - node.js

Question

how do i get the knex object in my controllers or any other model files if i am not using waterline.
for eg.:
in my api/models/Users.js
module.exports = {
find : function(id){
// my knex query
},
insert : function(data){
// my knex query again
}
}
So in my controllers i will just do:
var result = Users.find(id);
or
var result = Users.insert({username : 'sailsjs'});
or the knex object will be available globally with out being used in the model files itself... so that i can do the knex query in the controller it self
// UsersController/index
index : function(req, res){
// my knex query
}
Thanks
Arif

Answer 1

//config/bootstrap.js
module.exports.bootstrap = function (cb) {
var Knex = require('knex');
var knex = Knex.initialize({
client : "mysql",
connection : {
host :'localhost',
user :'root',
database : 'sales_force',
password : '*******'
}
});
knex.instanceId = new Date().getTime();
sails.config.knex = knex;
// It's very important to trigger this callack method when you are finished
// with the bootstrap! (otherwise your server will never lift, since it's waiting on the bootstrap)
cb();
};
// in the controller
var knex = sails.config.knex
this returns the knex object. the knex.instanceId shows that the same connection is used all over.
Please suggest if this might cause any problems.
Thanks
Arif

Answer 2

Best Option to use Knex Js globally in Sails Js (Tested for Version 1+) is to create a file named knex.js inside config directory, like this:
/**
* Knex Js, Alternate DB Adapter, In case needed, it is handy for doing migrations
* (sails.config.knex)
*
*
* For all available options, see:
* http://knexjs.org/
*/
const developmentDBConfig = require('./datastores');
const stagingDBConfig = require('./env/staging');
const productionDBConfig = require('./env/production');
function getConnectionString() {
let dbConnectionString = developmentDBConfig.datastores.default.url;
if (process.env.NODE_ENV === 'staging') {
dbConnectionString = stagingDBConfig.datastores.default.url;
}
if (process.env.NODE_ENV === 'production') {
dbConnectionString = productionDBConfig.datastores.default.url;
}
return dbConnectionString;
}
module.exports.knex = require('knex')({
client: 'postgresql',
connection: getConnectionString()
});
Now, in any file(helpers/controllers/views etc..) you can set and use knex as:
// Now use this knex object for anything like:
let user = await sails.config.knex('user').select('*').first();