What's the difference between using widget and owl to develop a frontend element in odoo? - widget

I want to develop a search panel for my module. And odoo provides me with two ways. Which one should I choose? Is there anything I should notice?

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How can we setup more than 5 applications at one place using PowerApps?

I want to design more than 5 mobile Applications, but it took lots of time. So I want to set up all applications at one place, Is PowerApps suitable for it?
In PowerApps you can create multiple Apps, but each app is individual.
You can have in each App multiple pages/screens. You can show hide screens/pages based on what you want to show to whom.
I wish we could write code in simple JSON format, but the WYSIWG low-code format necessitates applying little bits of code to all sorts of places in the app. See "Where's the Code?".
You could technically create all common sections of the apps in a Component Library then create each PowerApp separately using the components, customizing per the app specs as needed. Then package the apps as a Solution so they reside under version control, etc.
But at this point...its easier for me to:
Create a DEV/PROD Env's (if you don't have them already)
Create a few simple components (header, footer, etc.)
Use these components to "outline" the app
Customize each app with data sources, collections, Galleries, etc.
Test
Then export from DEV env, import to PROD env
Make simple (yet CRITICAL!) config changes
Rinse and repeat
Disclaimer:
4yr PowerApps dev
Canvas Apps only
DataVerse averse

What is the scope and effect of the 'Render Hints' in the Ontology Management Application?

What is the scope and effect of the 'Render Hints' in the Ontology Management Application?
Do these only apply to aggregations and other widgets built in Object Explorer views or do they affect other object-based frontend apps like Workshop and Quiver, too?
Specifically for the 'Selectable' and 'Sortable' hints, what does turning these on/off actually do? I saw somewhere that turning on these flags creates additional Elastic Search fields in Phonograph but still do not quite follow how that makes them a requirement for some frontend charts and widgets.

Yii2 - Upgrade from basic application to Advanced application

I have developed a Basic application in Yii2. It contains 3 models and respective controllers and views, no extension, no theme.
I now think that I should make that application with advanced template for future extend-ability.
Can I convert the basic app directly to advanced app or make a new one?
If I can convert the basic app, what are the steps?
I searched on google but can't find anything related to it except the comparison of the two.
You need modify this bootstrap file. It's make avalible use \common, \frontend, \backend and \console namespaces in project.
In this way you can create any quantity of applications in your project.

Which technologies are advised to use for developing the following project?

Two years ago I developed an admin panel using winFroms that is used to configure different settings for specific users, create/remove users etc. This information is retrieved and saved to a SQL Database server.
I want to make this panel accessible through web browsers. I already have a REST API that will communicate with the database.
My question is: which technologies are the best to make this panel?
I've come across WebForms, MVC, HTML with Angular, jQuery etc., or with SPA.
I would appreciate it if someone can enlighten me with this matter. I know its not really a specific programmatic question, but there are so many different approaches that is difficult to find the right or best way.
I guess you already know a lot of .NET so if I was you I would just use a WebForms or MVC project and then call some jQuery on the api to handle the CRUD operations. But if you wanna try something completely new then use Angular.

Best Practice for Developing Core Functions in Symfony2?

I am an experienced Symfony user and have started using Symfony2 and absolutely love it. A big thank you to Fabien and the guys over at Sensio.
I am pretty much there now in terms of developing in Symfony2 thanks to the documentation available, but there is one area in particular that I am still not 100% sure on.
I have a number of core functions that I want to use in different areas of the application and just want to know what the best practice for this is?
I am currently creating a bundle that has a number of functions in that handles the processing of images.
Is this the best way to do this and if so how do I then use or include these functions across other bundles?
You could just import the classes you want to use from your image handler bundle, but the way I would go about it is to register one or more services (like an image manager or thumbnail generator or whatnot) from your bundle so that the functionality you are creating will be available through the DIC for the entire application to use.