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Is there is already a tool or library which would support reversible (e.g. up and down) database migrations and could be used together with Spray framework? (And Scala, obviously)
So far, we are using FlyWay, which is working reasonably well, however cannot roll back and reapply failed migrations (a la Play framework). Which could be quite handy during early development phase, when things are changing a lot.
I had found this library: https://github.com/nafg/slick-migration-api, which references something called ReversibleMigration, but it doesn't seem to be exactly what I am looking for (a simple way to define up and down migrations).
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Are there any good resources to get started with Scala web development? Any good tutorials, blogs or books?
I have checked https://www.scala-lang.org/ and it is a not good starting point for scala web development.
When it comes to backend, you could start from learning some frameworks like play or akka on which play is actually based(there are plenty of books about them), but if you mean frontend by "web development", there is also scala.js, but I would not recommend it to you since it has rather poor community and there is no many people that actually use it. If you are interested in some database connection then I recommend reading smth about slick.
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I'm writing a uber-like mobile app for an academic project. This app is only a front-end for a system running on a server. This system, the backend is responsible for the user database, a search engine, messaging system and a location service (tracking system as in uber). I'm totally new to server development. My problems are:
How scala can be used to implement a backend?
How to handle concurrency, user authorizations, messaging and GPS data?
Additionally, In what cases should I use Kafka and Spark?
I would suggest you to go with play-framework. It has some learning curve, but once you start learning it seems quite interesting and is quite powerful too.
You must be familiar with scala, concurrency terms like future, actor and some database knowledge would be enough to start.
You can start by doing the examples provided in the documentation.
https://www.playframework.com/
All the best with your learning:)
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Has anyone seen note of if the REST API's are being continued for the new Firebase (I don't know what to call it other than 'new' - the current updates that were announced at Google I/O). I asked support - but I'm a few days in without a response. Just trying REST with random parameters on a new format index didn't do anything useful.
The updates look really good - but I have a lot of already existing REST code (mostly from Go) and I don't know what to do other than dig through the JavaScript and start hacking the Go libraries. If I'm going to get cut off there's not point even starting, and if there's an official interface on the way it's definitely not worth messing with.
Any help appreciated. :)
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I am fairly new to golang, and trying to identify the best tools for the job. Currently I am evaluating the following packages:
https://github.com/mattes/migrate
https://github.com/DavidHuie/gomigrate
https://bitbucket.org/liamstask/goose/
I was wondering if anyone had any experience with these (or other packages) and could provide some comments.
We use mattes/migrate at work and are very happy with it. It works with plain SQL files, handles file naming by itself and can easily be automated via CLI. It doesn't do anything Go specific.
With gomigrate you need to create the files yourself and write code for executing the migrations.
Take a look at https://github.com/pressly/goose, a maintained fork of https://bitbucket.org/liamstask/goose/.
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I am learning Scala, Play and Slick. Can you point me to some well written open source applications that I can use to better use these tools?
Thanks
Fully automatic Play Slick CRUD app
https://github.com/slick/play-slick-codegen
Corresponding talk: http://www.parleys.com/play/53a7d2c6e4b0543940d9e54c/
Activator templates:
https://typesafe.com/activator/templates#filter:slick
Some third-party Slick apps:
https://github.com/SlickChair/SlickChair
https://github.com/happymelly/teller
Lots of community related work:
https://github.com/slick/slick/pull/826/files