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I'm a newbie, just started using Play framework (2.8.x). Is there any recommended way to interact with MySQL in Play framework using ORM framework (slick or something else ?? after I searched around)? As I usually interact with MySQL in Flask using SQLAlchemy under Python, I'd wish to do something likewise under scala.
There is no one recommended way of doing database calls on Scala.
When it comes to Play Framework, then quite often it was used together with Slick because of who developed them. But Slick is Functional-Relational-Mapping, not Object-Relational-Mapping.
If you want to use ORM, you would have to use Hibernate as many people came to conclusion that ORMs do more harm than good in a long run, so nobody develops any ORM solution. (Not intending to argue about it here, just explaining why you won't find native ORM Scala solution that is maintained today).
When it comes to where community leans, you should consider some "safe SQL builder" like Doobie, Quill or jOOQ.
But as I said, nobody will ever tell you that there is some one solution that everybody would pick no matter what.
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If I use cats in my scala project, would it make migrating to dotty easier or difficult?
I'm not too sure of the ramifications of using a library like this and how hard it will be to eventually migrate over to dotty.
Using any library at all will force you to wait until it is released for Dotty.
For many libraries it will be a smooth migration if they don't use type system intensively, some will have to make some adjustments to provide support for new types, and all macros will need a total rewrite.
AFAIR Cats are making preparations for Dotty (you can see that they even have tests for it). But there is also the rest of TL ecosystem and each part of it will have to prepare for migration individually (while depending on its upstreams).
Personally, I wouldn't expect to migrate to Dotty in production for the first half a year. I would give some time to library author to migrate and test their changes. For now some attempts are being made, but since, not everything is set in stone yet, some libraries prefer to wait till right-before-the-release before they start migration.
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I want to go with Xamarin.Forms project. Now, I am bit confuse for consuming Rest API for this project. Performance matters.
There are many available but can any body please suggest me which should be best for Xamarin.Forms(.Net Standard)?
Microsoft Http Libraries or third party libraries like Refit, RESTSharp, PortableRest, etc.
Please suggest
All of these options are viable. I think the performance differences between these libraries will be marginal. So, it mostly comes down to what you feel comfortable with.
I like to use Refit because it will take a lot of redundant code out of your hands and you just have to focus on the contract. All the code for the actual calls is generated at compile-time (and thus won't impact your performance at runtime).
Also have a look at how well the library is maintained and if it's active. If you choose one that is already inactive for a while, chances are that you will start relying on older software versions which might not be what you want.
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I am sorry if this is not a constructive enough question.. Coming from the SQL world I'm just trying to wrap my head around this. After reading a lot about MongoDB, I've become very enthusiastic about it and consider using it for an upcoming application (in combination with Meteor).
However, I came across this blog post, which describes the troubles Diaspora ran into when using it and states "you should never use MongoDB". The examples she's giving sound pretty convincing.
Are these true problems with MongoDB, or were they using it wrong? Is this article now outdated and are there better ways for doing what they're doing (duplicate data for instance, like users being linked to each other, to posts and to comments, is a very common use case)?
Yes, there is a plenty of cases when mongodb not feet good, some of them are
When data perfectly described with 'table' metaphor (better using
SQL)
When you need ACID and transactions out of the box
When your workflow extremely oriented to write operation
When you need to generate complex cross-data reports
Data model have strongly relational view (a lot of connected
instances)
There is a lot of others, but this is just something which comes to my head fast.
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I would like to learn about polytypic concepts in Scala, I came across shapeless library what would be the best starting point for learning and applying shapeless.
I don't know if thats an answer you wan't, but the best push for me to start learning/using shapeless was a couple of Miles videos from different Scala conferences :
From flatmap
ScalaNE 2012
ScalaNE 2013
His forgotten blog
And as a big practise - i'm writing a lot using Spray toolkit, it uses shapeless inside. So try to write some web server or some client.
Also a github's wiki contains good intro for the library.
Great idea - try to rewrite some case classes into shapeless records with hlists, it's pretty cool to use it with some JSON converter =). Much of it is some generic kind of stuff wich is not very useful in real project, but if you want better understanding of type level programming, it's really great stuff
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I want to get into Scala and the lift framework, but since there is alot of confusion for me as a PHP programmer. So I got some questions to help me get started.
I want to setup a webserver that runs the lift framework with a Mongo DB backend where do I begin?
What is Apache Tomcat?
What is Jitty?
Is Comet an technology (protocol, design pattern?) or is it an project like Lift?
How can I setup Lift in Mac Os x as development enviroment, I understand I need Eclipse so I have downloaded it but what then? I don't understand how to install Scala.
The Lift wiki has a lot of information to get you started, and I would encourage you to join the mailing list. Where you will find many answers to questions already asked and you can of course ask more :)
Best luck using lift!
Try these series of tutorials http://blog.pboos.ch/2011/03/lift-tutorial-1-dev-environment-setup/