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I want to use a function so that i dont have to write the same logic over and over again in my calls to the find function on my MongoDb collections.
Here's the function I want, but notice that it contains 'self.res'. That's cause i just ripped it out of my find(...) call (below). Previously, when this was just an annoymous function, self.res is the HTTP response that we're building.
So how to i access self.res in my callback, if I use a named function, instead of an anonymous function in my find?
function findHandler(err, docs) {
if (!err) {
// Return Success & JSON Content-type
var length = docs.length;
writeMeta(self.res,200,url,length);
// Process results from Mongo
docs.forEach(function(e,i,a) {
//console.log(e,i,a);
self.res.write(JSON.stringify(e)+'\n');
});
self.res.end('\n');
} else {
getHandlerError(self.res,url);
}
}
Flatiron route for my /force API endpoint:
app.router.get('/force',function() {
// Setup
var self = this;
var method = 'GET';
var url = '/force';
var body = self.req.body;
// Create metrics data.
var shlock = new Shlock('api', method, url);
shlock.body = body;
console.log(url,method,shlock);
// Check for query string
var query = self.req.query;
if (!isQueryValid(query)) {
writeMeta(self.res,400,url,0);
self.res.end('\n');
} else {
// Handle count=true
if (query.hasOwnProperty('count') &&
query.count === 'true') {
var only = getFindCriteria('force',query);
force.count(only,function(err,docs) {
writeMeta(self.res,200,url,docs);
self.res.end('\n');
});
} else {
// Handle paging
if (query.hasOwnProperty('page')) {
var only = getFindCriteria('force',query);
var fields = getFindFields('force',query);
force.find(only,fields,function(err,docs) {
var length = docs.length;
writeMeta(self.res,200,url,length);
// Process results from Mongo
docs.forEach(function(e,i,a) {
//console.log(e,i,a);
self.res.write(JSON.stringify(e)+'\n');
});
self.res.end('\n');
}).skip(PAGE_SIZE*query.page)
.limit(PAGE_SIZE);
} else {
// Query Mongo
var only = getFindCriteria('force',query);
var fields = getFindFields('force',query);
force.find(only,fields,findHandler);
}
}
}
});
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