To access data within the a Lightning view, is it necessary to write client controller code that polls a server-side controller?
This makes sense based on my experience in other languages. But I was hoping / thought I read that somehow the immediate object's data - ex. on a record page - would be injected into the view. It just feels like this is a lot of boiler plate code to write on a platform that's supposed to expedite development.
Per people on the SF stackexchange site, yes, one has to write a bunch of boiler plate code (two controllers) to get data for the current record.
Related
I have a web application developed with JSF 2 and primefaces. The project has been frozen for months, but it's quite advanced, the whole application run inside the same container under glassfish, so it's a monolith.
My application has an user interface and its purpose is to offer them the possibility to organize urls to tutorials (any kinds) as cards, with tags for the classification, into folders. So any user has its own tree, they can make a research inside the other users's tree create a link on a file in their own tree, copy a entire folder, reorganize it etc.
Nowedays we hear a lot about microservices, Spring boot, Angular Js, react etc. I like to develop with JSF it's a great framework, but I'm asking myself about refactoring my application, at least the necessary parts into microservices, and if JSF is appropriate for that or if I should user other tools.
What I like for example with JSF is the facility to create views, its component approach, and how it handle the full cycle of a request.
For example with a simple folder creation form :
I have to choose the parent folder, so I can bind a research component to a backing bean that makes a research indirectly in my DB using a DAO ( in my app an EJB using JPA). That happens at the "invoke application" phase and refresh my form list with ajax at the end. When I submit the form I can also bind a converter to the research component to retrieve directly a Folder object, the converter uses also a DAO to retrieve the object that I need at the "Invoke application" phase to finish the job.
I also use validators to control different attributes of a new folder, usually I declare them inside my entity class (Folder, User ...) with annotations like #NotNull etc. Before I save the folder on my db, I also check the user rights to see if he can write inside the parent folder and so on. I do that inside the backing bean, so at the 'invoke application' phase, and return a faces message if anything happens wrong.
When I read about micro-services I see that you can use them directly inside a form using json for communication, so it seems quite different. For example if I have a micro-service for the CRUD operations of my folders, are the validators, the converters, part of the service or are they stand alone services ? And what about the security checks ? that kind of architecture is quite mysterious to me.
ps : English is not my mother tongue so be indulgent please :)
AngularJs is pretty ancient man :)
You have to look at the pain points to identify ways to tear down your monolith. Monolith pains are usually slow and painful dev cycle and difficult manual test phases. If you did the entire arquillian thing and have full continuouos integration with single button deployments, you've slain the beast the hard way. Not many braved this route. But if you're looking at mounting feature creep with code freezes and manual test cycles then yeah you kind of want to try to pull some of those features out into a service you can redeploy very quickly
Thanks in advance for any help offered and patience for my current web-coding experience.
Background:
I'm currently attempting to develop an web based application for my family's business. There is a current version of this system I have developed in C#, however I want to get the system web-based and in the process learn cakephp and the MVC pattern.
Current problem:
I'm currently stuck in a controller that's supposed to take care of a PurchaseTicket. This ticket will have an associated customer, line items, totals etc. I've been trying to develop a basic 'add()' function to the controller however I'm having trouble with the following:
I'm creating a view with everything on it: a button for searching customer, a button to add line items, and a save button. Since I'm used to developing desktop applications, I'm thinking that I might be trying to transfer the same logic to web-based. Is this something that would be recommended or do'able?
I'm running into basic problems like 'searching customer'. From the New Ticket page I'm redirecting to the customer controller, searching and then putting result in session variable or posting it back, but as I continue my process with the rest of the required information, I'm ending up with a bit of "spaghetti" code. Should I do a multi part form? If I do I break the visual design of the application.
Right now I ended up instantiating my PurchaseTicket model and putting it in a session variable. I did this to save intermediate data however I'm not sure if instantiating a Model is conforming to cakephp standards or MVC pattern.
I apologize for the length, this is my first post as a member.
Thanks!
Welcome to Stack Overflow!
So it sounds like there's a few questions, all with pretty open-ended answers. I don't know if this will end up an answer as such, but it's more information than I could put in a comment, so here I go:
First and foremost, if you haven't already, I'd recommend doing the CakePHP Blog Tutorial to get familiar with Cake, before diving straight into a conversion of your existing desktop app.
Second, get familiar with CakePHP's bake console. It will save you a LOT of time if you use it to get started on the web version of your app.
I can't stress how important it is to get a decent grasp of MVC and CakePHP on a small project before trying to tackle something substantial.
Third, the UI for web apps is definitely different to desktop apps. In the case of CakePHP, nothing is 'running' permanently on the server. The entire CakePHP framework gets instantiated, and dies, with every single page request to the server. That can be a tricky concept when transitioning from desktop apps, where everything is stored in memory, and instances of objects can exist for as long as you want them to. With desktop apps, it's easier to have a user go and do another task (like searching for a customer), and then send the result back to the calling object, the instance of which will still exist. As you've found out, if you try and mimic this functionality in a web app by storing too much information in sessions, you'll quickly end up with spaghetti code.
You can use AJAX (google it if you don't already know about it) to update parts of a page only, and get a more streamlined UI, which it sounds like something you'll be needing to do. To get a general idea of the possibilities, you might want to take a look at Bamboo Invoice. It's not built with CakePHP, but it's built with CodeIgniter, which is another open source PHP MVC framework. It sounds like Bamboo Invoice has quite a few similar functionalities to what you're describing (an Invoice has line items, totals, a customer, etc), so it might help you to get an idea of how you should structure your interface - and if you want to dig into the source code, how you can achieve some of the things you want to do.
Bamboo Invoice uses Ajax to give the app a feel of 'one view with everything on it', which it sounds like you want.
Fourth, regarding the specific case of your Customer Search situation, storing stuff in a session variable probably isn't the way to go. You may well want to use an autocomplete field, which sends an Ajax request to server after each time a character is entered in the field, and displays the list list of suggestions / matching customers that the server sends back. See an example here: http://jqueryui.com/autocomplete/. Implementing an autocomplete isn't totally straight forward, but there should be plenty of examples and tutorials all over the web.
Lastly, I obviously don't know what your business does, but have you looked into existing software that might work for you, before building your own? There's a lot of great, flexible web-based solutions, at very reasonable prices, for a LOT of the common tasks that businesses have. There might be something that gives you great results for much less time and money than it costs to build your own solution.
Either way, good luck, and enjoy CakePHP!
So, I'm in the midst of my first major project with Angular. I have one controller that is doing a ton of the legwork, and it's reached the point where it's thousands of lines of JavaScript.
I'd like to break this up somehow, but I can't seem to find a solid example anywhere. The code is mostly made up of functions used to do calculations on objects, so directives and modules don't seem like the right answer, but I could be wrong there.
How are you guys organizing code in your large Angular projects? Should I just suck it up, or is there a sane way to split this into easy to scan files?
I suggest putting at least some of those objects and their related calculations into services, then inject the services into your controller(s). See the Sticky Notes Part 1 blog entry for an example of a service that encapsulates some data and provides methods to access/manipulate that data.
See if you can break up your controller into multiple controllers, one for each view. A view can be as large as a page, or just some chunk/block on a page.
To quote from a google group post I saw recently: "I prefer to think of angular controllers as dumb apis/configs for my views and leave all the heavy lifting to services." -- reference
There are a few things that you need to ask yourself when you are in a controller.
Are you doing any DOM manipulation in the controller? This is a definite NO. Dont ever do that. It always belongs in the directives department.
Are you writing any Business Logic in your controller? That too is a NO. Your Business logic should in most cases exist in a Service. That is the right place for it.
Now, have a look at your controller. Is it devoid of these 2 things and still larger than 1000 lines? It is highly unlikely, but even if it somehow is happening, then consider breaking down your controller into smaller controllers. This breaking of controllers have to be done based on the view.
To sum things up, your controller is just a place where you glue up the business logic and your views in the HTML. It should technically never contain anything other than these glues.
I usually create a Util factory (seems to be the way to go now in Angular rather than services) and have it return any shared logic as a set of methods.
https://gist.github.com/lamba/c275f5f010090632209e
I'm stumped and need some ideas on how to do this or even whether it can be done at all.
I have a client who would like to build a website tailored to English-speaking travelers in a specific country (Thailand, in this case). The different modes of transportation (bus & train) have good web sites for providing their respective information. And both are very static in terms of the data they present (the schedules rarely change). Here's one of the sites I would need to get info from: train schedules The client wants to provide users the ability to search for a beginning and end location and determine, using the external website's information, how they can best get there, being provided a route with schedule times for the different modes of chosen transport.
Now, in my limited experience, I would think the way to do that would be to retrieve the original schedule info from the external site's server (via API or some other means) and retain the info in a database, which can be queried as needed. Our first thought was to contact the respective authorities to determine how/if this can be done, but this has proven to be problematic due to the language barrier, mainly.
My client suggested what is basically "screen scraping", but that sounds like it would be complicated at best, downloading the web page(s) and filtering through the HTML for relevant/necessary data to put into the database. My worry is that the info on these mainly static sites is so static, that the data isn't even kept in a database to build the page and the web page itself is updated (hard-coded) when something changes.
I could really use some help and suggestions here. Thanks!
Screen scraping is always problematic IMO as you are at the mercy of the person who wrote the page. If the content is static, then I think it would be easier to copy the data manually to your database. If you wanted to keep up to date with changes, you could then snapshot the page when you transcribe the info and run a job to periodically check whether the page has changed from the snapshot. When it does, it sends an email for you to update it.
The above method could also be used in conjunction with some sort of screen scaper which could fall back to a manual process if the page changes too drastically.
Ultimately, it is a case of how much effort (cost) is your client willing to bear for accuracy
I have done this for the following site: http://www.buscatchers.com/ so it's definitely more than doable! A key feature of a web scraping solution for travel sites is that it must send you emails if anything went wrong during the scraping process. On the site, I use a two day window so that I have two days to fix the code if the design changes. Only once or twice have I had to change my code, and it's very easy to do.
As for some examples. There is some simplified source code here: http://www.buscatchers.com/about/guide. The full source code for the project is here: https://github.com/nicodjimenez/bus_catchers. This should give you some ideas on how to get started.
I can tell that the data is dynamic, it's to well structured. It's not hard for someone who is familiar with xpath to scrape this site.
I'm trying to make an App-wide media-upload which should have the possibility of being accessible from every controller/model.
I thought of on table media which holds record of all uploaded files, my schema looks like this:
id
controller //to keep the reference from which controller the file was uploaded
foreign_key //since files should be uploaded to specific records, I need this id
filename
extension
fullname
size
created
modified
I'm not sure what would be the best approach in doing this. I've thought of components, plugins and a behavior but still am unsure.
My App has many different controllers with different records.
For example it manages projects and should now be able to attach PDFs to specific projects from within the project-edit mask.
Since this is a feature needed by other controllers, too I want to write it application wide.
I'm pretty sure I need a helper to call the upload-function from within the masks.
May something like: echo $this->Media->uploadMask(); which provides me with an ready uploading-mask for the controller and id I'm editing at the moment.
But I don't know which route I should call for the upload. Something like /media/upload would be very good, but I'm not sure if this fits correctly into the MVC-approach.
Would it be better to call it from my specific controllers? Or is an AJAX-upload to just a normal controller/model like better?
What you are describing is a Behaviour, which is basically an object of methods that can apply to any model. For controllers there are also Components.
There are already a couple of established upload behaviours for CakePHP you should check out: Meio Upload which is good for basic image manipulation and also the CakePHP Media Plugin which is more advanced and more recently updated.