Since I learned Rails from Micheal Hartl's tutorial, all of my apps are set up to use SQLite3 in development, but Postgresql in production. This is causing problems with searches that work in development but not in production. From other Stack overflow questions, I've learned that using different databases in different environments is a bad idea.
I think that my best solution is to change the development database to Postgresql. But I'm sure that it's not as simple as adjusting the db name in my gemfile. What other changes will I need to make? What are some potential side effects that I should be aware of?
Thank you in advance for any insight.
You can do it two ways.
First Way :
Below are steps you can follow to convert sqlite to postgres.
Install postgres.
Change your Gemfile in your rails app and add PG gem.
Run bundle install.
Change the database.yml file to use postgres.
Run rake db:setup followed by rake db:migrate.
Everything should work as expected, Because with rake db:setup and rake db:migrate you will get identical database as before.
Second Way :
Now rails also provide way to directly change DB from one DB to another, You can check here.
Just use below command and you are done.
bin/rails db:system:change --to=postgresql
Copy Data as well :
If you want to copy data as well you can use yaml_db gem.
Related
Project:
https://github.com/jmopr/job-hunter
Background:
Took only 2 intro course on Java 7 years ago.
So I was browsing GitHub and ran across this nifty project that deals with scraping & applying for jobs on indeed.com.
The question is, how do you run it? Here is what I tried to do:
Tried to execute applier.ru I figured I was doing something wrong after getting:
/home/shap/Desktop/job-hunter-master/applier.rb:19:in initialize': uninitialized constant JobApplier::Job (NameError)
from /home/shap/Desktop/job-hunter-master/applier.rb:169:innew'
from /home/shap/Desktop/job-hunter-master/applier.rb:169:in `'
Something was missing, so looking around I found the bin folder and tried executing /bin/setup.ru but i ran into this error:
== Preparing database ==
/var/lib/gems/2.3.0/gems/railties-4.2.5.1/lib/rails/application/configuration.rb:110:in database_configuration': Cannot loadRails.application.database_configuration`:
Could not load database configuration. No such file - ["config/database.yml"] (RuntimeError)
Are we supposed to generate our own database file? how would we do that?
Any help or even a push in the right path is deeply appreciated.
You are supposed to generate your own database configuration. It should be stored at config/database.yml. It's a file that specify where's your db server, what's the name of the database and what should be the credentials to access it. Google "rails database.yml example".
Once you have that, creating your actual database is as easy as running these commands
rake db:create
rake db:migrate
There may be many-many other different obstacles on your journey of making this application run. Things that are obvious to rails devs, but arcane to total strangers. I suggest finding and completing a ruby on rails tutorial.
This is ruby on rails project,
after checkout you need install all required dependencies, with command
bundle exec install
Run project you can with command
./bin/rails server
If project is started successful, you can access it with browser using address http://localhost:3000
more about rails you can find there http://guides.rubyonrails.org/getting_started.html
http://guides.rubyonrails.org/getting_started.html
I am very new to ruby on rails. What is the function of rake. For example here one command like
rake db:create
Here this command which is used to create the new database. But before we use rake. Why we use rake word here, what it is function.
And what is the different between rake rake-task & rakefile.
Thanks for your advice.
Rake is a Ruby build command. When you invoke rake, you are actually using the Rake tool and you ask Rake to read and use the Rakefile available in your Rails application folder.
Rake is used to automate several tasks, from the creation of a database, to a database migration, to the generation of new models or controllers.
I encourage you to read this article about Rake to learn more about this tool. It will be one of the fundamental tools you'll use working with Rails, so you really need to understand what it is before moving forward.
Rake is a gem that acts like make in the *nix world. You use it to run scripts, usually the Rakefile. You use it to run tests or set up databases. Rails uses it extensively because there are many steps that need to be run between deployments.
Rake can do pretty much anything you need to automate.
There is a Wikipedia article on it that is a good starting point: http://en.wikipedia.org/wiki/Rake_(software)
The main thing it does, really, is to be a central point for command-line tasks for the application. You don't really need it for half the things it's used for (and quite frequently isn't the best IMO), but by running rake -D you'll get a list of all the commands available, which is helpful.
I've just been given a folder containing everything in a ruby on rails project that was developed 2 years ago. The folder doesn't contain a sqlite3 file however, so I am unable to view the database and I currently don't know how to run the application on my local computer.
What are the steps to re-starting a previously developed project so that further development can be done to it?
Thanks!
Owwwwww that is hard.
I see two main problems: gem dependencies and the database.
Gem dependencies are now cleanly managed with bundler, but two years ago that was not the case.
Getting all the gems you need for your project together will be the hardest part (depending on the size of the project).
Gem dependencies
Previously gems had to be defined in config/environment.rb, but actually require could be scattered all over the app, and depending on the discipline of the original developers, I guess no versions were specified. So it will be hard to compose a set of working gems, since a lot of gems change between versions.
In config/environment.rb you will also find the rails version.
Use rvm and a clean gemset. If the rails version is something 2.3.x, you could start using bundler.
Database
If you find a config/database.yml: then you know which type of database was expected. Adapt it to connect to your database (of the same type). If there is no such thing, start off with sqlite3, as it will cope with most simple cases (it will get you started).
The simplest way to get the database up and running is
rake db:create
rake db:setup
This will create an empty database (from your configuration), and then load the schema and the seeds.
Next steps
get the tests running (hopefully there are any)
consider upgrading to rails 3
Hope this helps.
First you'll need a config/database.yml file that defines how Rails connects to your database. If that's already in there, hopefully it's not in your versioning system :)
Second, you'll need to create the databases. You can do that with rake db:create.
Third, you will need to load the database schema. DO NOT do rake db:migrate as Dave mentioned in the comment above. This is not the recommend way to load the schema since it's slower and may not accurately represent the schema. Instead, use rake db:schema:load.
I'm learning rails with "agile web development with rails (3rd edition)" and I've gotten to the point where I'm supposed to make the depot app.
I have created the depot app, and I've added the script/generate files. I've raked the db. For some reason, no tables where created in the migration and upon running this command:
depot> sqlite3 db/development.sqlite3 "select version from schema_migrations"
I get nothing. Then when running localhost in my browser, instead of getting what I'm supposed to, I get the standard welcome to rails page.
Any advice?
Resolved:
It's always the simple things. Had to direct to localhost:3000/products instead of just to localhost:3000 - wasn't aware of this. Thanks!
There is a number of possibilities here, firstly, judging by the fact you can see the standard "Welcome to Rails" page you haven't deleted public/index.html - you should do this so that Rails can route to the root /
Secondly, if your migrations are running correctly you should have a schema.rb file in ./db with the instructions for each table, if not then something is failing there.
I have not read the 'Agile web development with Rails" book but I am assuming it was written before the release of Rails 3, which means your app does not use Bundler for gem dependency management so it might be worth checking that sqlite3 gem is installed. You can check this with gem list sqlite if you don't see something like "sqlite3-ruby (1.3.2)" then you need to install it.
Lastly, check the log files in ./log/
Well I guess you've created multiple migrations by now so try typing rake db:migrate at the command line and let use know what it says?
I tried rake gems:install but I get
No such file or directory - /Users/macuser/Sites/hq_channel/config/database.yml
I bet the default is set wrong.
What file do I need to change? And where do I find what to change it to?
it can't find your database.yml file, which is a required config file that should have been generated when you made a new project. Without that being there, the rails environment won't start, which means no rake tasks work
Often times folks create a database.yml.example. I typically do a:
[rails_root]$cp config/database.yml.example config/database.yml
Edit the file to match my environment, then try to install the gems/migrate the DB.
However - this is often times hit-or-miss due to a plethora of different reasons (environment.rb code, bootstrapping/initializer issues, vendored gems w/ C extensions, etc..).
If the app is on Rails 2.3 (you only specified 2), you may be able to override the standard rake gems:install with a little Bundler joy.