This is Worklight 6.1 code with dojo, testing with Chrome and the std dev server Liberty. What I want this code to do is to query a collection, which should have 0 or 1 entries, and either retrieve the one entry if it exists or create an entry with a supplied set of values. What I'm trying to do is store a url, id, and password for a service. If this is the first time the app has run after installation I want to prompt the user for this info and store it. The code to prompt the user will be added later. If it is not the first run of the app then the values should be stored in the collection and be retrieved. I'll add code later to allow the user to change and update the values.
What is happening now is that the .add never seems to be executed, and also the execution sequence I'm seeing thru the breakpoints I've set seems weird.
Here is the setup code
// set up the jsonStore
var collectionName = 'servers';
var collections = {};
collections[collectionName] = {};
// initialize the default jsonStore Monitor credentials
var jsonURL = 'http://myserver.com:9082';
var jsonUser = 'keyser';
var jsonPassword = 'soze';
And here is the problem code
// Initialize the JSONStore
WL.JSONStore.init(collections)
.then(function() {
console.log("store initialized");
// query the store
var query = {_id: 0};
WL.JSONStore.get(collectionName)
.find(query)
.then(function(arrayResults) {
console.log("credentials retrieved " + arrayResults.length);
if (arrayResults.length > 0) {
// retrieve the credentials from the json object
console.log("password retrieved " + arrayResults[0].json.password);
jsonURL = arrayResults[0].json.url;
jsonUser = arrayResults[0].json.user;
jsonPassword = arrayResults[0].json.password;
} else {
// load the default credentials into jsonStore
var credentials = {url: jsonURL, user: jsonUser, password: jsonPassword};
WL.JSONStore.get(collectionName)
.add(credentials)
.then(function() {
console.log("credentials loaded " + credentials.url);
})
.fail(function(errorObject) {
console.log("credential load failed");
});
} // end of else
// Query the model list
queryModels();
}) // end of get(collectionName) then
.fail(function(errorObject) {
console.log("credentials not retrived");
}); // end of get(collectionName) fail
}) // end of init(collections) then
.fail(function(errorObject) {
console.log("store init failed" + errorObject);
}); // end of init(collections) fail
}); // end of ready
When I step thru it flows in this sequence.
init(collections)
Then it jumps immediately to the "end of ready". Seems weird but I'm a rookie so maybe it's OK?
Back to the get(collectionName)
to the .then and logs "credentials retrieved" with and array length of 0
To the else clause of the statement
And it breaks on the get(collectionName) in the else clause. So far so good
From here it jumps to queryModels(), skipping over the .add (far as I can tell)
Then it returns to the .then under the 2nd get and logs "credentials loaded"
At this point execution ends "normally" except,
The item never gets added to the collection, and
The queryModels runs before I expect it to, I want it to run after the item is added.
By now it's probably obvious that I'm a rookie, so I'm probably making the rookie mistake. I know
I'm dealing with deferreds here with the .then and .fails, and I'm nesting them, which seems to be
an accepted technique, but I'm not getting the execution sequence I want.
I've tried this code commenting out the 2nd get(collections) in a couple of formats and it barfs both ways.
// WL.JSONStore.get(collectionName)
.add(credentials)
and
// WL.JSONStore.get(collectionName)
servers.add(credentials)
Any help greatly appreciated. Thanks!
Here's my "answer" below based on what I learned from the other answers below.
Bluewing and cnandrue's answers were both very helpful, and I got it working. The main issues I had turned out to be.
I had failed to grasp that slot 0 in a collection equates to a document _id key of 1. I was trying to query _id = 0, and never getting a hit. The add to the collection was working all along, I was just not reading it correctly.
Moving the queryModels into the if/else clauses (bluewing's suggestion) worked, and reading the material cnandreu referenced (very worthwhile to read) explained why it worked. Thanks!
The tip about the "weird" execution sequence being an artifact of the breakpoints was also very useful, I quit chasing that red herring.
Here is a working draft of the code after fixing these issues. I did not implement all of the suggestions yet, but probably will as I polish this up. Thanks again.
// Initialize the JSONStore - you have to .init to start the collection before you can read it.
WL.JSONStore.init(collections)
.then(function() {
console.log("store initialized");
// query the store
var query = {_id: 1};
WL.JSONStore.get(collectionName) // get 1
.find(query)
.then(function(arrayResults) {
console.log("credentials retrieved " + arrayResults.length);
if (arrayResults.length > 0) {
// retrieve the credentials from the json object
console.log("password retrieved " + arrayResults[0].json.password);
jsonURL = arrayResults[0].json.url;
jsonUser = arrayResults[0].json.user;
jsonPassword = arrayResults[0].json.password;
queryModels();
} else {
// load the default credentials into jsonStore
var credentials = {url: jsonURL, user: jsonUser, password: jsonPassword};
WL.JSONStore.get(collectionName) // get 2
.add(credentials)
.then(function(numberOfDocumentsAdded) {
console.log("Number of Docs Added" + numberOfDocumentsAdded);
queryModels();
}); // end of .add then
} // end of else
}); // end of get(collectionName) 1 then
}) // end of init(collections) then
.fail(function(errorObject) {
console.log("something failed" + errorObject);
}); // end of init(collections) fail
All the JSON store calls ( like add , init etc) are asynchronous. So only you are getting that weird flows when you are checking with Breakpoints.
To get you execution sequence try to move the queryModels(); once the credentials are loaded.
WL.JSONStore.get(collectionName)
.add(credentials)
.then(function() {
console.log("credentials loaded " + credentials.url);
queryModels();
})
My suggestion is the same as Bluewings', but I wanted to share some pseudocode:
function handleCredentials (arrayResults, callback) {
if (arrayResults.length > 0) {
//.... synchronous code here.
setTimeout(function () {
callback();
}, 0);
} else {
WL.JSONStore.get(collectionName)
.add({url: jsonURL, user: jsonUser, password: jsonPassword})
.then(function() {
callback();
});
}
}
WL.JSONStore.init(collections)
.then(function() {
WL.JSONStore.get(collectionName)
.find({_id: 1})
.then(function (arrayResults) {
handleCredentials(arrayResults, function () {
queryModels();
});
});
});
Notice I created a function for handleCredentials, that function will either do a synchronous operation (setting some variables with the result from the find call) or an asynchronous operation (calling add to add credentials). A setTimeout with 0 is called to preserve async behavior, this is explained in detail here. After the handleCredentials function has finished, you call the queryModels function via the callback pattern.
As an aside, I recommended reading this blog post: What’s so great about JavaScript Promises?. Especially the "Error Handling" section. You don't need to add a .fail to every promise, you can get away with less failure functions and the error object should provide enough details into what went wrong. JSONStore error objects are documented here, notice they contain the source of the failure (e.g. src: 'find').
Related
When I add bot.hears(...), it registers middleware for handling matching text messages. But now it will handle those messages even if they are sent any time, even if not expected.
So if I am creating a stateful service, I would like to listen to particular messages only at appropriate time.
How can I unregister middleware, so that it does not hear any more previously handled messages?
I turned out I was looking for Scenes. How to use them is described on Github.
I'll just post a slightly modified code from the links above:
const { Telegraf, Scenes, session } = require('telegraf')
const contactDataWizard = new Scenes.WizardScene(
'CONTACT_DATA_WIZARD_SCENE_ID', // first argument is Scene_ID, same as for BaseScene
(ctx) => {
ctx.reply('Please enter guest\'s first name', Markup.removeKeyboard());
ctx.wizard.state.contactData = {};
return ctx.wizard.next();
},
(ctx) => {
// validation example
if (ctx.message.text.length < 2) {
ctx.reply('Please enter real name');
return;
}
ctx.wizard.state.contactData.firstName = ctx.message.text;
ctx.reply('And last name...');
return ctx.wizard.next();
},
);
const stage = new Scenes.Stage();
stage.register(contactDataWizard);
bot.use(session());
bot.use(stage.middleware());
But I still don't know how to generally implement it, so I need to find it out in the Scenes code of Telegraf.
I'm testing nonAngular page with Protractor. I have a variable, which I use across specs stored as browser object. The problem is that I use it in certain spec, but sometimes it get's undefined. Strangely in the same spec file, few cases before it is used without a problem. It seems as if it loses the value in between even though I don't call it or manipulate it.
Conf:
onPrepare: function() {
...
beforeAll(function) {
return browser.ignoreSynchronization = true;
}
}
Spec 1 in which I define this variable:
// page objects
var createUserPage = require('...
// variables
var username = '';
describe(... {
it(... {
...
// initializing page objects
var createUser = new createUserPage();
// store useername text in global variable
createUser.successfullyCreatedUserText.getText().then(function(text) {
browser.username = text;
});
});
});
Spec 2 in which I use this variable:
describe(... {
it(... {
...
// display username
console.log("Username: " + browser.username);
// enter username
home.usernameInput.clear().sendKeys(browser.username);
// pause browser
browser.sleep(500);
// click on Search button
home.searchButton.click();
});
});
As written before I get console output like:
Username: undefined
and error in stack trace:
TypeError: each key must be a number of string; got undefined
This doesn't happen all the time, but rather occasionally. What I'm doing wrong?
I would declare the variable in your config, either as a global or a param. I would probably do it the global way, since params are typically assigned in the config before running tests.
onPrepare: function() {
global.username;
}
Then in your specs you can assign the value (cant remember if you use global.username or just username in the specs) and the variable will persist as long as that driver session stays alive.
Because much of our imported data technically has validation errors, users are unable to update fields without first correcting previously entered bad data. This wouldn't be a problem except that many times this user doesn't have the information needed to enter a correct value into that field but we still need to save their update.
Is it possible to disable the validate on submit for a DynamicForm?
Is it possible to disable the validate on submit for a DynamicForm?
there's a disableValidation attribute, it disables client-side validators.
The best solution I could find thus far.
I'm disabling validation and overridding getValues, which is called as part of saveData so I manually parse through any fields and look for errors. If I find an error I remove it from the return value and store it under the valuesManager.invalidatedFields.
If a field had an error it will not be included in the save, but because the server will return the original value I had to override setValues as well to prevent your (bad) change from being overridden.
Also, because getValues is called on initial load it validates on load as well.
isc.ValuesManager.create({
disableValidation: true,
invalidatedFields: {},
setValues: function(values){
console.log("setting values..", this.invalidatedFields);
for (var key in this.invalidatedFields) {
if (this.invalidatedFields.hasOwnProperty(key)) {
values[key] = this.invalidatedFields[key];
}
}
this.Super("setValues", arguments);
},
getValues: function () {
this.invalidatedFields = [];
var data = this.Super("getValues");
for (var key in data) {
if (data.hasOwnProperty(key)) {
var form = this.getMemberForField(key);
if (form && !form.getField(key).validate()) {
console.log(key + " failed validation", data[key]);
this.invalidatedFields[key] = data[key];
delete data[key];
}
}
}
return data;
}
});
I'm new to using mongoose middleware and don't know if I'm following it well. Here is the purpose. After saving department, I want to populate university and save departmentId inside university object.
DepartmentSchema.post('save', function(next) {
var departmentId = this._id;
University.findOne({
_id: this.university
}, function(err, university) {
if (!university.departments) {
university.departments = [];
}
university.departments.push(new ObjectId(departmentId));
university.save(function(err) {
if (err) return console.log('err-->' + err);
// saved!
});
});
});
This is working fine but I'm not sure why in Cascade style delete in Mongoose they have used exec() and next() calls. Could you please tell me the purpose of these calls? I don't know what they do and not able to find relevant documentation. I just want to make sure I'm not missing anything.
clientSchema.pre('remove', function(next) {
// 'this' is the client being removed. Provide callbacks here if you want
// to be notified of the calls' result.
Sweepstakes.remove({
client_id: this._id
}).exec();
Submission.remove({
client_id: this._id
}).exec();
next();
});
Post middleware doesn't have reference to the next function and you cant do any flow control. Its actually passing the department that just got saved, so your code can be something like this:
DepartmentSchema.post('save', function(department) {
var departmentId = department._id;
In pre middleware you have access to the next middleware in the order of execution. Which is the order of definition on a particular hook.
// hook two middlewares before the execution of the save method
schema.pre('save', pre1);
schema.pre('save', pre2);
function pre1(next) {
// next is a reference to pre2 here
next()
}
function pre2(next) {
// next will reference the hooked method, in this case its 'save'
next(new Error('something went wrong');
}
// somewhere else in the code
MyModel.save(function(err, doc) {
//It'll get an error passed from pre2
});
Mongoose also gives you the ability to execute pre middlewares in parallel, in this case all middlewares will be executed in parallel but hooked method will not execute till the done is called from each middleware.
As for the exec() function, there are two ways of executing a query in Mongoose, either pass a callback to the query or chain it with an exec(): User.remove(criteria, callback) or User.remove(criteria).exec(callback), if you don't pass a callback to the query, it'll return a query object and it won't execute unless you chain it with exec()
I want to save the results from a query using itemFileReadStore into an array called boxes, but the return value is empty (presumably because fetch is run asynchronously).
The gotItems function builds the array as I want it to, but I can't return that back to myself for any use! I could build the rest of my functionality into the gotItems part, but that would make my code unpretty.
How do I return an array for general use in my JavaScript from the gotItems function?
function getContentFile() {
contentStore = new dojo.data.ItemFileReadStore({
url: '../config/content.json',
preventCache : true
});
var boxes = new Array();
contentStore.fetch({query: {partner : 'enabled'}, onItem: gotItems });
return boxes;
}
function gotItems(item ) {
boxes.push( contentStore.getValue(item,'title') );
console.log( boxes );
return boxes;
}
dojo.addOnLoad( function() {
boxes = getContentFile();
console.log(boxes);
fadeIn('header', 500, 0);
});
Welcome to the world of asynchronous operations.
You'll need to do it with the "continuation-style" programming. ItemFileReadStore's fetch operations is asynchronous -- as you already know by passing the gotItems continuation to it.
contentStore.fetch({query: {partner : 'enabled'}, onItem: gotItems }) will return immediately. Your boxes will be empty at that point (because JavaScript is single-threaded). gotItems is executed after data arrived and subsequent to the function passed to dojo.addOnLoad returning.
You have to put your handling code:
console.log(boxes);
fadeIn('header', 500, 0);
inside the continuation gotItems itself. For example, something like:
function gotItems(item ) {
var boxes = [];
dojo.forEach(item, function(box) {
boxes.push( contentStore.getValue(box,'title') );
});
console.log(boxes); // You probably need to store "boxes" somewhere instead of just logging it
fadeIn('header', 500, 0);
}
Also, the data passed to onItems is an array, so you need to iterate it.
You don't have access to the results when the function returns because as you guessed, the fetch operation executes asynchronously.
You can either put the code that uses the results in your gotItems() function (as answered by Stephen), or you can use Deferreds and Promises. IMHO, that's a better alternative since it lets you organize your code better (once you get used to the idioms of dealing with promises, the code reads more naturally) and it allows you to transparently execute both synchronous and asynchronous operations.
See these two Dojo tutorials on the subject.
In your case, a possible solution involving deferreds would read like:
function getContentFile() {
contentStore = new dojo.data.ItemFileReadStore({
url: '../config/content.json',
preventCache: true
});
var dfd = new dojo.Deferred();
var boxes = new Array();
contentStore.fetch({
query: { partner : 'enabled' },
onItem: function(item) {
boxes.push( contentStore.getValue(item,'title') );
},
onComplete: function() {
// resolve the promise and execute the function in then()
dfd.callback(boxes);
}
});
return dfd;
}
dojo.addOnLoad( function() {
getContentFile().then(function(boxes) {
console.log(boxes);
fadeIn('header', 500, 0);
});
});