How to do this request using DocumentClient?
aws dynamodb describe-table --table-name MusicCollection
Document client is for working with items, but assuming you mean how do you do it with Javascript, the answer is like this:
https://docs.aws.amazon.com/AWSJavaScriptSDK/latest/AWS/DynamoDB.html#describeTable-property
var params = {
TableName: "MusicCollection"
};
dynamodb.describeTable(params, function(err, data) {
if (err) console.log(err, err.stack); // an error occurred
else console.log(data); // successful response
});
Related
I'm trying to implement some error handling into my MCV AngularJS application, but came across this one issue that I'm not sure how to solve.
Structure
In my AngularJS service ticketService I have the following method:
this.downloadFile = function (fileId) {
return $http.get(baseUrl + "/Downloadfile/" + fileId, { responseType: "blob" });
}
And in my controller:
$scope.downloadFile = function (fileId) {
ticketService.downloadFile(fileId)
.then(function (response) {
// Handle correct request and response
}, function (err) {
// Handle error
notify({ message: "Something went wrong: " + err.data.Message, position: "center", duration: 10000 });
})
}
Here's what I return from the backend MVC Web API method:
var error = new HttpError("Failed to find file, bla bla bla.");
return Request.CreateResponse(HttpStatusCode.NotFound, error);
Problem
My issue is that since my responseType is set to be blob, my err object is the same response type. I would believe that it should be possible for my backend service to override this response type, and respond with an object that contains some Message.
From this response, I would've thought that I could get err.data.Message, but perhaps I misunderstood this scenario?
Thank you in advance.
public HttpResponseMessage Get(int id)
{
try
{
return Request.CreateResponse(HttpStatusCode.OK, new { Status =
"OK", Message = this._myContext.GetCustomer(id) });
}
catch(Exception e)
{
return Request.CreateResponse(HttpStatusCode.Conflict, new {
Status = "NO", Message = e.ToString() });
}
}
You can return any message like "Failed to find file, bla bla bla." in Message. Then you just need to check in ajax success method like data.Message,
The $http service uses the XHR API which is not capable of changing the responseType on the fly.
You can set the status message and use that:
public ActionResult Foo()
{
Response.StatusCode = 403;
Response.StatusDescription = "Some custom message";
return View(); // or Content(), Json(), etc
}
Then in AngularJS:
$scope.downloadFile = function (fileId) {
return ticketService.downloadFile(fileId)
.then(function (response) {
// Handle correct request and response
return response.data;
}).catch(function (response) {
// Handle error
console.log(response.status);
console.log(response.statusText);
throw response;
});
};
Alternative approaches are:
Use the Fetch API which has a more powerful and flexible feature set.
Use the FileReader API and JSONparse() method to convert the Blob to a JavaScript Object.
I am just wondering if I am doing anything wrong. I save data to mongo like this:
router.route('/userAdditionalData')
//updates current user data
.put(function(req, res, next){
UserAdditionalInfo.findOne({userRef: req.body.userRef}, function(error, foundUser){
if(error){
console.log('Error in adding additional User Data: ', error);
return done(null);
};
if(foundUser){
foundUser.update(req.body, function(error, count){
res.send(200, foundUser)
});
}
else{
var addData = new UserAdditionalInfo();
addData.middleName = req.body.middleName;
addData.employer = req.body.employer;
addData.jobDescription = req.body.jobDescription;
addData.userRef = req.body.userRef;
addData.save(function(error, data){
if(error){
return res.send(500, error)
}
return res.send(200, data);
});
}
});
})
And I get the data like this:
.get(function(req, res){
UserAdditionalInfo.find(function(err, data){
if(err){
return res.send(500, err);
}
return res.send(200, data);
});
});
In my angular controller, when I get the data using $http.get():
$http.get('/api/userAdditionalData').then(function(response){
console.log('response -> ', response.data[0]);
controller.userAdditionalData = response.data[0];
});
The console perfectly logs my response, but when I log the controller.userAdditionalData I get undefined. Now, when I put a $timeout of 10 around my console.log:
$timeout(function(){
console.log(controller.userAdditionalData);
}, 10);
everything works fine. Which means that my data is being set too late. Is there something that I am not doing/doing wrong?
This is beacause the async paradigm in JavaScript. If you make an async call and outside make a log, probably prints undefined because the async is not finished. Wait for the async call with a promise or multiple promises if in a loop, when the promise ends , then you can log the value or use it.
I have an app which posts, gets and deletes data and I would like to add 'update' functionality as well but I can't figure it out..
I have a node.js server which has such api:
app.get('/api/feedbacks', function(req, res) {
// use mongoose to get all feedbacks in the database
getfeedbacks(res);
});
// create feedback and send back all feedback after creation
app.post('/api/feedbacks', function(req, res) {
// create a feedback, information comes from AJAX request from Angular
FeedBack.create(req.body, function(err, feedback) {
if (err)
res.send(err);
// get and return all the feedbacks after you create another
getfeedbacks(res);
});
});
// delete a feedback
app.delete('/api/feedbacks/:feedback_id', function(req, res) {
FeedBack.remove({
_id : req.params.feedback_id
}, function(err, feedback) {
if (err)
res.send(err);
getfeedbacks(res);
});
});
and such angular service which speaks to node api:
service.factory('FeedBacks', ['$http',function($http) {
return {
create : function(feedBackData) {
return $http.post('/api/feedbacks', feedBackData);
},
get : function() {
return $http.get('/api/feedbacks');
},
delete : function(id) {
return $http.delete('/api/feedbacks/' + id);
}
}
}]);
That way I can post, get and delete data.
My goal is to add also update function.
What I have tried on node:
// update a feedback
app.put('/api/feedbacks/:feedback_id', function(req, res) {
// edit a feedback, information comes from AJAX request from Angular
FeedBack.put(req.body, function(err, feedback) {
if (err)
res.send(err);
// get and return all the feedbacks after you edit one
getfeedbacks(res);
});
});
on Angular service:
update: function(editFeedId, editedFeed){
return $http.put('/api/feedbacks/' + editFeedId, editedFeed);
}
controller looks like:
$scope.editFeed = function(id) {
$scope.editFeedId = id;
$scope.editedFeed = 'replace this txt'
FeedBacks.update($scope.editFeedId, $scope.editedFeed)
// if successful creation, call our get function to get all the new
feedBacks
.success(function(data) {
console.log('updated');
$scope.feedbacks = data;
});
};
I get 500 error as I execute editFeed(). I couldn't figure out to configure that! Where do I do wrong? Any Tips?
Thanks a lot in advance!
I'm assuming you're using Mongo here, in which case your update statement is incorrect.
It should be something like:
app.put('/api/feedbacks/:feedback_id', function(req, res) {
FeedBack.update({_id: req.params.feedback_id}, req.body, function(err, feedback) {
if (err)
res.send(err);
// get and return all the feedbacks after you edit one
getfeedbacks(res);
});
});
How to implement customGet from restangular?
I wrote some code in a server like this:
user.controller.js:
exports.getRunner = function(req, res) {
User.find({provider: "instagram"}, function (err, users) {
if (err) return res.send(500, err);
res.json(200, users);
});
};
index.js:
router.get('/getRunner', controller.getRunner);
If I try to get data from postman... it responds the right json data, it works properly.
But when I try using Restangular customGet in my client side, I get instead an undefined error.
This is my client side:
Restangular.all('users').customGET('getRunner').then(function(teams) {
$scope.teams = teams;
});
I've read several of the other posts about this problem and none of the solutions seem to be working for me. I have the following code in my View:
this.model.set({
username: $('#user-username').val(),
role: $('#user-role').val(),
description: $('#user-description').val()
});
this.model.save({ user_id: this.model.get('user_id')}, {
success: function(user, response) {
console.log('success:', response);
$('.flash-message').text("Success").show();
},
error: function(user, response) {
console.log('error:', response);
$('.flash-message').text(response.error).show();
}
});
and this on my server controller (nodejs running express 3):
UserController.prototype.updateAction = function(req, res) {
if (req.route.method != "put") {
res.send({status: "error", error: "update must be put action and must include values"});
return false;
}
var query = {'user_id': req.params.id};
var user = req.body;
var userRepository = this.userRepository
// delete _id to avoid errors
delete user._id;
userRepository.update(query, user, {}, function(err, updated) {
if ((err) || (!updated)) {
res.send({"status": "error", "error": err});
return false;
}
// send updated user back
util.log('updated user ' + user.user_id);
res.setHeader('Content-Type', 'application/json');
res.status(200);
res.send(JSON.stringify({"status": "success", "updated": updated}));
});
}
On save, my model is saved correctly in the server and I have verified the server response with this. So, as far as I can tell the server is returning status 200, valid JSON, with a valid JSON response header. And yet my backbone model.save function always triggers the error callback. Can anyone please tell me why and how to resolve this?
I am able to get this to work if set the dataType to text like so:
this.model.save({ user_id: this.model.get('user_id')}, {
dataType: "text",
success: function(user, response) {
console.log('success:', response);
$('.flash-message').text("Success").show();
},
error: function(user, response) {
console.log('error:', response);
$('.flash-message').text(response.error).show();
}
});
but doing so does not allow me to get the response back from the server. Instead I get this in the response var:
success: {
"_id": "5133b02062e15ed1d2000001",
}
Backbone expects to get back the model that it sent in its PUT or POST request body.
Instead of:
res.send(JSON.stringify({"status": "success", "updated": updated}));
Try this in your server's response:
res.json(user);
There may be a possibility that your call may have got in state 200 connection established which backbone detects as error, Backbone throws success only when the call is 200OK.
What's your server code? You need to make sure you're sending json back to backbone like so:
//In your express POST route
user.save(function(err) {
if(err){
console.log(err);
return res.json(401);
} else {
console.log('user: ' +user.username + ' saved');
return res.json(200);
}
Then in your backbone view you can check for the response and do what you need:
//some function in your view
this.model.save(this.formValues, {
success: function(model, response, options) {
if (response == 200) {
console.log('success :' + response);
//Do stuff
} else {
console.log('error: '+response);
//etc.
Also note that as per the backbone model documentation:
"save accepts success and error callbacks in the options hash, which will be passed the arguments (model, response, options)"