I use boilerplate code to retrieve data from 1 store such as
MonthStore monthStore = new MonthStore();
monthStore.open().then((months) {
but I am having difficulty retrieving data from multiple, related stores. Is this the best I can do?
MonthStore monthStore = new MonthStore();
monthStore.open().then((months) {
TranStore tranStore = new TranStore();
tranStore.open().then((trans) {
// months[trans.monthId].name
});
});
I tried using Future.wait like this
// declare the stores
MonthStore monthStore = new MonthStore();
TranStore tranStore = new TranStore();
Future.wait(
[
getMonth(monthStore, intMonth),
// another call
]
)
.then...
Future<Map> getMonth(mnthStore, mnth) {
mnthStore.open()
.then((mnths) {
return mnths[mnth];
})
// need a return here!
});
but the editor says no return specified in the Future.
What am I missing here?
Future<Map> getMonth(mnthStore, mnth) {
return mnthStore.open() // <= here the return is important
.then((mnths) {
return mnths[mnth];
});
});
Related
I've implemented repository pattern with two entity managers,
mainManager is for read only and delete, and updateManager is used for edit and add new entities. I use createEmptyCopy() to create updateManager.
Before i update an entity i export the entity from mainManager and import into the updateManager, after the change i call to updateManager.saveChanges() method.
I've noticed that i get back the updated entities in the promise response. i wonder what is the best practice to import those entities back into the mainManager?
here is my code:
function ($q, $http, entityManagerFactory) {
var self = this;
self.mainManager = entityManagerFactory.newManager();
self.updateManager = entityManagerFactory.newManager();
self.saveChanges = function () {
return self.updateManager.saveChanges();
};
self.rejectChanges = function() {
self.updateManager.rejectChanges();
};
self.getDomains = function () {
self.mainManager.clear();
var query = new breeze.EntityQuery()
.from('Domains')
.orderBy('name');
return self.mainManager.executeQuery(query);
};
self.createEmptyDomain = function () {
var domain = self.updateManager.createEntity('Domain');
return domain;
};
self.editDomain = function(domain) {
var exported = self.mainManager.exportEntities([domain]);
return self.updateManager.importEntities(exported).entities[0];
}
self.addDomain = function (domain) {
self.updateManager.addEntity(domain);
return self.updateManager.saveChanges();
};
self.deleteDomain = function (domain) {
domain.entityAspect.setDeleted();
var deferred = $q.defer();
self.mainManager.saveChanges().then(
function(data) {
deferred.resolve(data);
},
function (reason) {
console.log(reason);
self.mainManager.rejectChanges();
deferred.reject(reason);
});
return deferred.promise;
};
}
Right now i'm calling mainManager.clear() and get the data again from the server as you can see above in getDomains function.
But i think this is too expansive, why call the server if i already have the updated entities from the saveChanges promise?
i've also tried to import those entities back to mainManager using:
mainManager.importEntities(data.entities, { mergeStrategy: breeze.MergeStrategy.OverwriteChanges });
but i get an internal null breeze exception:
TypeError: Cannot read property 'forEach' of undefined
at EntityManager.proto.importEntities (breeze.debug.js:13081)
at self.importEntities (domain-list.service.js:22)
at domain-list.controller.js:70
at processQueue (angular.js:13170)
at angular.js:13186
at Scope.promises.$get.Scope.$eval (angular.js:14383)
at Scope.promises.$get.Scope.$digest (angular.js:14199)
at Scope.promises.$get.Scope.$apply (angular.js:14488)
at done (angular.js:9646)
at completeRequest (angular.js:9836)
the error is from this line breeze.debug.js:13081
13080: var tempKeyMap = {};
13081: json.tempKeys.forEach(function (k) {
13082: var oldKey = EntityKey.fromJSON(k, that.metadataStore);
13083: // try to use oldKey if not already used in this keyGenerator. 13084: tempKeyMap[oldKey.toString()] = new EntityKey(oldKey.entityType,
13085: that.keyGenerator.generateTempKeyValue(oldKey.entityType, oldKey.values[0]));
13086: });
var exportData = updateManager.exportEntities(data.entities, false);
mainManager.importEntities(exportData,
{ mergeStrategy: breeze.MergeStrategy.OverwriteChanges });
I figured if the devtool can list all created IndexedDB, then there should be an API to retrieve them...?
Dose anyone know how I get get a list of names with the help of a firefox SDK?
I did dig into the code and looked at the source. unfortunately there wasn't any convenient API that would pull out all the databases from one host.
The way they did it was to lurk around in the user profiles folder and look at all folder and files for .sqlite and make a sql query (multiple times in case there is an ongoing transaction) to each .sqlite and ask for the database name
it came down this peace of code
// striped down version of: https://dxr.mozilla.org/mozilla-central/source/devtools/server/actors/storage.js
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
"use strict";
const {async} = require("resource://gre/modules/devtools/async-utils");
const { setTimeout } = require("sdk/timers");
const promise = require("sdk/core/promise");
// A RegExp for characters that cannot appear in a file/directory name. This is
// used to sanitize the host name for indexed db to lookup whether the file is
// present in <profileDir>/storage/default/ location
const illegalFileNameCharacters = [
"[",
// Control characters \001 to \036
"\\x00-\\x24",
// Special characters
"/:*?\\\"<>|\\\\",
"]"
].join("");
const ILLEGAL_CHAR_REGEX = new RegExp(illegalFileNameCharacters, "g");
var OS = require("resource://gre/modules/osfile.jsm").OS;
var Sqlite = require("resource://gre/modules/Sqlite.jsm");
/**
* An async method equivalent to setTimeout but using Promises
*
* #param {number} time
* The wait time in milliseconds.
*/
function sleep(time) {
let deferred = promise.defer();
setTimeout(() => {
deferred.resolve(null);
}, time);
return deferred.promise;
}
var indexedDBHelpers = {
/**
* Fetches all the databases and their metadata for the given `host`.
*/
getDBNamesForHost: async(function*(host) {
let sanitizedHost = indexedDBHelpers.getSanitizedHost(host);
let directory = OS.Path.join(OS.Constants.Path.profileDir, "storage",
"default", sanitizedHost, "idb");
let exists = yield OS.File.exists(directory);
if (!exists && host.startsWith("about:")) {
// try for moz-safe-about directory
sanitizedHost = indexedDBHelpers.getSanitizedHost("moz-safe-" + host);
directory = OS.Path.join(OS.Constants.Path.profileDir, "storage",
"permanent", sanitizedHost, "idb");
exists = yield OS.File.exists(directory);
}
if (!exists) {
return [];
}
let names = [];
let dirIterator = new OS.File.DirectoryIterator(directory);
try {
yield dirIterator.forEach(file => {
// Skip directories.
if (file.isDir) {
return null;
}
// Skip any non-sqlite files.
if (!file.name.endsWith(".sqlite")) {
return null;
}
return indexedDBHelpers.getNameFromDatabaseFile(file.path).then(name => {
if (name) {
names.push(name);
}
return null;
});
});
} finally {
dirIterator.close();
}
return names;
}),
/**
* Removes any illegal characters from the host name to make it a valid file
* name.
*/
getSanitizedHost: function(host) {
return host.replace(ILLEGAL_CHAR_REGEX, "+");
},
/**
* Retrieves the proper indexed db database name from the provided .sqlite
* file location.
*/
getNameFromDatabaseFile: async(function*(path) {
let connection = null;
let retryCount = 0;
// Content pages might be having an open transaction for the same indexed db
// which this sqlite file belongs to. In that case, sqlite.openConnection
// will throw. Thus we retey for some time to see if lock is removed.
while (!connection && retryCount++ < 25) {
try {
connection = yield Sqlite.openConnection({ path: path });
} catch (ex) {
// Continuously retrying is overkill. Waiting for 100ms before next try
yield sleep(100);
}
}
if (!connection) {
return null;
}
let rows = yield connection.execute("SELECT name FROM database");
if (rows.length != 1) {
return null;
}
let name = rows[0].getResultByName("name");
yield connection.close();
return name;
})
};
module.exports = indexedDBHelpers.getDBNamesForHost;
If anyone want to use this then here is how you would use it
var getDBNamesForHost = require("./getDBNamesForHost");
getDBNamesForHost("http://example.com").then(names => {
console.log(names);
});
Think it would be cool if someone were to build a addon that adds indexedDB.mozGetDatabaseNames to work the same way as indexedDB.webkitGetDatabaseNames. I'm not doing that... will leave it up to you if you want. would be a grate dev tool to have ;)
I'm using Q Promises to retrieve data from my redis repository. The problem I'm having, is that through each iteration, the array object (localEncounter) I'm using to store data returned from the chained functions is never updated at each iteration. Previously, I tried to solve this with a foreach loop and spread but the results were the same.
How should I correct this so that localEncounter is updated at each iteration, and ultimately localEncounters contains correct data when returned? Thank you.
var localEncounters = [];
var localEncounter = {};
Promise.all(ids.map(function(id) {
return localEncounter, getEncounter(id, client)
.then(function (encounter) {
encounterObject = encounter;
//set the fields for the return object
localEncounter['encounterid'] = encounterObject[f_id];
localEncounter['screeningid'] = encounterObject[f_screening_id];
localEncounter['assessmentid'] = encounterObject[f_clinical_assessment_id];
localEncounter['psychevalid'] = encounterObject[f_psych_eval_id];
//get screening
return getScreening(encounterObject[f_screening_id], client);
})
.then(function (screening) {
//set the fields for the return object
localEncounter['screeningbegintime'] = screening[f_begin_time];
//get assessment
return getAssessment(localEncounter['assessmentid'], client);
})
.then(function (assessment) {
//set the fields for the return object
localEncounter['assessmentbegintime'] = assessment[f_begin_time];
//get psycheval
//localEncounters.push(assessment);
return getPsychEval(localEncounter['psychevalid'], client);
})
.then(function (psychEval) {
//set the fields for the return object
localEncounter['assessmentbegintime'] = psychEval[f_begin_time];
localEncounters.push(localEncounter);
}
, function (reason) {
console.log(reason); // display reason why the call failed;
reject(reason, 'Something went wrong creating the encounter!');
})
})).then(function(results) {
// results is an array of names
console.log('done ');
resolve(localEncounters);
})
Solution: I only needed to move the declaration of localEncounter inside the map iterator
before:
var localEncounter = {};
Promise.all(ids.map(function(id) {
after:
Promise.all(ids.map(function(id) {
var localEncounter = {};
This now allows that each id iteration gets its own localEncounter object.
My function have to create a directory, and copy the entire folder hierarchy from another directory to this new one. All of the operation are done asynchronously, but I want this function to return a Future that when I call the .then(result) on it, will have done all of the asynchronously work.
But I don't know where exactly I should put my completer.complete() to achieve that.
Future<Directory> createCopyDirectory(Directory directoryToCreate){
Completer<Directory> completer = new Completer<Directory>();
completer.complete(
directoryToCreate.create().then((directory){
Directory contentToCopy = new Directory(globalPathOfDirectoryToCopy);
List<Future> creatingContent = new List<Future>();
contentToCopy.list(recursive:true, followLinks:false).forEach((f){
if (f is File){
File fileToCreate = new File(f.path.replaceFirst('pages', userID));
creatingContent.add(fileToCreate.create(recursive:true).then((_){
f.readAsString().then((fileContent){
fileToCreate.writeAsString(fileContent);
});
}));
}
});
return Future.wait(creatingContent).then((_){ return directoryToCreate;});
})
);
return completer.future;
}
I precise that my function work like expected, But if I try to access directly the content I should have created in this function, like in the then() call, Dart bring me an expection like I have not created the content. So the completer.complete() is surely badly placed and call then() before the content has been created.
I have tried with the completer.complete() on the ending Future.wait(creatingContent) or by replacing return directoryToCreate by completer.complete(directoryToCreate) but the result is the same.
I am a bit confused on the way to build a proper Future based function in this kind of situation.
You shouldn't need a Completer here.
Future<Directory> createCopyDirectory(Directory directoryToCreate) {
return directoryToCreate.create().then((directory) {
String userID = split(userDirectory.path).last;
Directory contentToCopy = new Directory(globalPathOfDirectoryToCopy);
List<Future> creatingContent = new List<Future>();
return contentToCopy
.list(recursive: true, followLinks: false)
.forEach((File f) {
if (f is File) {
File fileToCreate = new File(f.path.replaceFirst('pages', userID));
creatingContent.add(fileToCreate.create(recursive: true).then((_) {
return f.readAsString().then((fileContent) {
return fileToCreate.writeAsString(fileContent);
});
}));
}
}).then((_) {
return Future.wait(creatingContent).then((_) {
return directoryToCreate;
});
});
});
}
Just to demonstrate how you could use the Completer:
Future<Directory> createCopyDirectory(Directory directoryToCreate) {
Completer<Directory> completer = new Completer<Directory>();
directoryToCreate.create().then((directory) {
String userID = split(userDirectory.path).last;
Directory contentToCopy = new Directory(globalPathOfDirectoryToCopy);
List<Future> creatingContent = new List<Future>();
contentToCopy.list(recursive: true, followLinks: false).forEach((f) {
if (f is File) {
File fileToCreate = new File(f.path.replaceFirst('pages', userID));
creatingContent.add(fileToCreate.create(recursive: true).then((_) {
return f.readAsString().then((fileContent) {
return fileToCreate.writeAsString(fileContent);
});
}));
}
}).then((_) => Future
.wait(creatingContent)
.then((_) => completer.complete(directoryToCreate)));
});
return completer.future;
}
I have a viewmodel which consists of a list(foreach loop) of DoctorPrices and when clicking on an item in the list it open up a CRUD form on the side. However when i update the values on the CRUD the observableArray that is bound to the foreach is not refreshing? (although the values are updates in the DB correctly)
From my data access module i call the following query.
function getDoctorServices(doctorId) {
var query = breeze.EntityQuery
.from('DoctorPrices')
.where('DoctorID', 'eq', doctorId).orderBy('ListOrder');
return manager.executeQueryLocally(query);
}
In my viewmodel i have the following code:
this.services = ko.computed(function() {
return doctorServices.getDoctorServices(doctorList.viewModel.instance.currentDoctorID());
});
services is bound using a foreach loop (not posting here as the code is simple and works)
When i click on a one of the DoctorPrices it gets the data as follows and places it in an observable:
this.selectedPrice = function (data, event) {
self.currentService(data);
self.showEdit(true);
};
I then bind selectPrice to a simple form that has the properties on it to be modified by the user. I then call manager.SaveChanges().
This results in the following problem: the value is being updated correctly but the GUI / Original List that is bound in the foreach is not being updated? Are the properties in breeze not observables? What is the best way to work with something like this.
I thought of a workaround and changing the code with something like this:
doctorList.viewModel.instance.currentDoctorID.subscribe(function() {
self.services([]);
self.services(doctorServices.getDoctorServices(doctorList.viewModel.instance.currentDoctorID()));
});
But i feel that clearing the array in that way is sloppy and not the right way of doing things specially with long lists.
Can someone please point me in the right direction on how to bind observableArray properties properly so they are updated?
Additional code my VM Component:
function services() {
var self = this;
this.showForm = ko.observable(false);
this.currentService = ko.observable();
this.services = ko.observableArray(doctorServices.getDoctorServices(doctorList.viewModel.instance.currentDoctorID()));
this.title = ko.observable();
doctorList.viewModel.instance.currentDoctorID.subscribe(function() {
self.services([]);
self.services(doctorServices.getDoctorServices(doctorList.viewModel.instance.currentDoctorID()));
self.showDetails(false);
});
this.show = function (value) {
self.showForm(value);
};
this.showDetails = ko.observable(false);
this.addNewService = function() {
self.currentService(doctorServices.createService(doctorList.viewModel.instance.currentDoctorID()));
console.log(self.currentService().entityAspect.entityState);
self.showDetails(true);
};
this.showDelete = ko.computed(function() {
if (self.currentService() == null)
return false;
else if (self.currentService().entityAspect.entityState.isDetached()) {
self.title('Add new service');
return false;
} else {
self.title('Edit service');
return true;
}
});
this.deleteService = function() {
self.currentService().entityAspect.setDeleted();
doctorServices.saveChanges();
doctorList.viewModel.instance.currentDoctorID.notifySubscribers();
};
this.closeDetails = function () {
doctorServices.manager.rejectChanges();
doctorList.viewModel.instance.currentDoctorID.notifySubscribers();
self.showDetails(false);
};
this.selectService = function (data, event) {
self.currentService(data);
self.showDetails(true);
};
this.saveChanges = function () {
console.log(self.currentService().entityAspect.entityState);
if (self.currentService().entityAspect.entityState.isDetached()) {
doctorServices.attachEntity(self.currentService());
}
console.log(self.currentService().entityAspect.entityState);
doctorServices.saveChanges();
doctorList.viewModel.instance.currentDoctorID.notifySubscribers();
self.currentService.notifySubscribers();
self.showDetails(true);
};
}
return {
viewModel: {
instance: new services()
},
template: servicesTemplate,
};
Below is my Breeze Data Class:
define('data/doctorServices', ['jquery', 'data/dataManager', 'knockout','mod/medappBase', 'breeze', 'breeze.savequeuing'], function ($, manager, ko,base, breeze, savequeuing) {
var services = ko.observableArray([]);
return {
attachEntity:attachEntity,
getServices: getServices,
services: services,
manager:manager,
getDoctorServices: getDoctorServices,
getServiceById: getServiceById,
createService:createService,
hasChanges: hasChanges,
saveChanges: saveChanges
};
function getServices() {
var query = breeze.EntityQuery.from("DoctorPrices");
return manager.executeQuery(query).then(function (data) {
services(data.results);
}).fail(function (data) {
console.log('fetch failed...');
console.log(data);
});;
}
function getDoctorServices(doctorId) {
var query = breeze.EntityQuery
.from('DoctorPrices')
.where('DoctorID', 'eq', doctorId).orderBy('ListOrder');
var set = manager.executeQueryLocally(query);
return set;
}
function getServiceById(serviceId) {
return manager.createEntity('DoctorPrice', serviceId);
//return manager.getEntityByKey('DoctorPrice', serviceId);
}
function handleSaveValidationError(error) {
var message = "Not saved due to validation error";
try { // fish out the first error
var firstErr = error.innerError.entityErrors[0];
message += ": " + firstErr.errorMessage;
base.addNotify('error', 'Could not save.', message);
} catch (e) { /* eat it for now */ }
return message;
}
function hasChanges() {
return manager.hasChanges();
}
function attachEntity(entity) {
manager.addEntity(entity);
}
function createService(doctorId) {
return manager.createEntity('DoctorPrice', { DoctorPricingID: breeze.core.getUuid(), DoctorID:doctorId }, breeze.EntityState.Detached);
};
function saveChanges() {
return manager.saveChanges()
.then(saveSucceeded)
.fail(saveFailed);
function saveSucceeded(saveResult) {
base.addNotify('success', 'Saved.', 'Your updates have been saved.');
}
function saveFailed(error) {
var reason = error.message;
var detail = error.detail;
if (error.innerError.entityErrors) {
reason = handleSaveValidationError(error);
} else if (detail && detail.ExceptionType &&
detail.ExceptionType.indexOf('OptimisticConcurrencyException') !== -1) {
// Concurrency error
reason =
"Another user, perhaps the server, " +
"may have deleted one or all of the settings." +
" You may have to restart the app.";
} else {
reason = "Failed to save changes: " + reason +
" You may have to restart the app.";
}
console.log(error);
console.log(reason);
}
}
});
Please note this is my frist attempt at both a data class and VM. At the moment i am relying heavily on clearing the array ([]) and using notifySubscribers to make the array refresh :(
I bet you're missing an observable somewhere. I can't tell because you keep hopping from property to property whose definition is not shown.
For example, I don't know how you defined this.currentService.
I'm confused by this:
this.services = ko.computed(function() {
return doctorServices.getDoctorServices(doctorList.viewModel.instance.currentDoctorID());
});
Why is it a ko.computed? Why not just make it an observable array.
self.service = ko.observableArray();
// ... later replace the inner array in one step ...
self.service(doctorServices.getDoctorServices(
doctorList.viewModel.instance.currentDoctorID()));
I urge you to follow the observability trail, confident that your Breeze entity properties are indeed observable.
vm.selectedPrice = ko.dependentObservable(function () {
return doctorServices.getDoctorServices(doctorList.viewModel.instance.currentDoctorID());
}, vm);
vm is ur model on which u applied bindings , try this it will work.