I am newbie with ubuntu and trying to working with this one. And here is my problem.
I create a new program in rails with database by this command
rails new freelancer --database=postgresql
Everthing woking fine, seems I got a postgresql database with rails.
My problem is, I do not know how to connect my database to the dbeaver program, btw, if I run those command rails db:setup and rails db:migrate after connect my database to dbeave program, it can make some new database ?
And finally can you show me how to start and stop the server too ?
Thank you very much.
Your database connection is specified on your config/database.yml, under your project folder, one block for each environment, but by default you will be using development env.
If you haven't done anything else than what you commented (and you did it right hehe), your database should be already created with name freelancer_development, and you just need to connect to it using DBeaber. Create a new connection using PostgreSQL adapter (check out this video) and following data:
Host: localhost
Port: 5432
Database: freelancer_development
User: [YOUR_POSTGRES_USER]
Password: [YOUR_POSTGRES_PASSWORD]
If you don't know your Postgres user. Try with following combinations, if none of them works, you'll need to setup one.
User
Password
postgres
postgres
postgres
[YOUR_UBUNTU_USER_NAME]
To start your Rails server, just run rails s (short for rails server) on your terminal while being inside your project folder, and hit Ctrl+C to stop it.
Related
I'm running into the following error after uninstalling and installing several times I just can't seem to get postgresql working. I am trying to setup the coding environment for ruby on rails 6 on windows 10. I have followed the following articles and have made it all the way to creating a user where i get the following errors.
links to how i got here
https://github.com/serivas/wsl2_rails_setup
https://gorails.com/setup/windows/10#ruby-rbenv
https://www.postgresql.org/download/linux/ubuntu/
Error I'm getting when i type
sudo -u postgres createuser abc -s
Error Message;
createuser: error: could not connect to database template1: could not connect to server: No such file or directory
Is the server running locally and accepting
connections on Unix domain socket "/var/run/postgresql/.s.PGSQL.5432"?
Thanks in advance!
Here's how I solved my problem for anyone that might be having similar issues.
Make sure that your windows 10 is updated to be able to run WSL2
First follow the link below to get Ruby and Rails installed.
https://gorails.com/setup/windows/10
Setup PostgreSQL from the link above,
the link below also help me setup PostgreSQL;
https://learn.microsoft.com/en-us/windows/wsl/tutorials/wsl-database
If your having trouble logging into Postgres make sure that you create a user in Postgres that allows the user to be able to CREATEDB. So if your user is JohnDoe make sure that you give permission for JohnDoe to create database.
Links to help you out with granting permission.
https://dba.stackexchange.com/questions/33285/granting-a-user-account-permission-to-create-databases-in-postgresql
Make sure that you are starting your postgresql server.
sudo service postgresql start
And to Stop
sudo service postgresql stop
After User has rights to create the database, then you can go ahead and type in
rake db:create
I'm trying to migrate users from one system to another. Each system has its own database and different classes.
My plan is to connect to one database, read some info from one database via SQL commands:
ActiveRecord::Base.connection.execute(sql_command)
do something with the data and then write some results on the new database using normal models.
I plan on doing that inside Sidekiq job but I'm trying to do some testing using a Rails console on Heroku.
This should be pretty straightforward, but this proves ridiculously difficult.
When I launched a Rails console on Heroku. I'm connecting to DATABASE_URL, which is ok, but when I try to connect to the old database and execute a command, like this:
ActiveRecord::Base.establish_connection(adapter: "postgresql", encoding: "unicode", pool: 10, url: "postgres://...info...")
ActiveRecord::Base.connection.execute("select count(*) from users")
I end up with:
PG::ConnectionBad (could not connect to server: No such file or directory)
Is the server running locally and accepting
connections on Unix domain socket "/var/run/postgresql/.s.PGSQL.5432"?
I can, however, connect to this old database by launching my rails console on heroku using DATABASE_URL as the env variable:
$ heroku run 'DATABASE_URL=postgres://...info... rails console' -a console' -a app
BUT I don't know how to switch back to my new database so I can update things.
How does one switch databases at run time when using rails console on heroku?
Why try to runtime switch the database? Why not have both connected at the same time and specify at the model level which database they read/write from? Rails supports connecting multiple databases and specifying in individual models what database connection to use: https://guides.rubyonrails.org/active_record_multiple_databases.html
The problem was that using url: didn't work and all parameters needed to be specified.
config = {"adapter"=>"postgresql", "encoding"=>"unicode", "pool"=>10, "username"=>"u...", "password"=>"p...", "port"=>5432, "database"=>"d...", "host"=>"ec2..."}
If you go for a 3tier database yml, you can use this:
config = ActiveRecord::Base.configurations["production"]["seconddb"]
Then, you can use establish_connection
ActiveRecord::Base.establish_connection(config)
ActiveRecord::Base.connection.execute("select count(*) from users")
Once I started specifying username, password, port, database and host, it all worked like a charm.
To work with both databases at the same time, a good way is to create a class
class OtherDB < ActiveRecord::Base
establish_connection(ActiveRecord::Base.configurations["production"]["seconddb"])
end
Then you can call things that way
OtherDB.table_name = "table_name"
OtherDB.first
ref (Establish a connection to another database only in a block?)
And to run SQL commands:
OtherDB.connection.execute("select count(*) from users")
I'm trying to connect my Rails app to an EC2 instance that contains a PG database. I've already checked with Navicat that I can connect to the database given the EC2 details. The issue is that when run locally the Rails app can't be viewed; it throws the error "database configuration does not specify adapter". A similar issue is thrown when I try a database migration. I haven't even tried to push this up to my Rails EC2 since it isn't working locally.
My database.yml file looks like this:
production:
adapter: postgresql
encoding: unicode
database: postgres
host: ec2-54-197-115-117.compute-1.amazonaws.com
pool: 10
port: 5432 (have both included and removed this line)
username: a database username for security
password: the password associated with that user
My gem files include the gem pg.
For the database name I just wrote what it had in Navicat, but perhaps there's an official name associated with it I should be using; if so, how would I find it? The host I got from the EC2 details. And the username and password were the ones I set with the postgres database via unix.
Thanks in advance for any insight!
Edit:
Fixed!
Fixed! I had forgotten to create an actual DB after setting up the PG; I changed the name in my database.yml file to reflect the new db name. Also, I needed to set on my Rails app environment directly (I thought Apache did this automatically w/Passenger) with "export RAILS_ENV=production". I thought it was still broken when I restarted my server and nothing had changed, but I just had to restart the console. Hope this helps someone else out too!
I have the following developement section of my development.yml file:
development:
adapter: postgresql
host: localhost
database: testtb
username: app_user
password: ENV['APP_USER_POSTGRES_PASSWORD'] <= Troublesome line
When I open a rails console via bundle exec rails console and type ENV['APP_USER_POSTGRES_PASSWORD'] I get back the DB password I've specified in my local profile. However, when I start my rails server, it can't connect to the DB, failing with
PGError FATAL: password authentication failed for user "app_user"
This was previously working when I had the DB password actually typed out in plain text, rather than trying to access it via ENV['...'], but for obvious reasons I want to keep the actual password out of this file entirely (and therefore out of the code repository) while still being able to commit other, non-secure changes to the database.yml file.
Is there something special about the syntax I'm missing, or are the environment variables for some reason not available when the database.yml file is being loaded?
Update: Some people report in the comments that this doesn't work as of Rails 4.2.x.x. I haven't tried it myself, so YMMV.
Ah, finally figured out the simple solution - it accepts embedded Ruby:
password: <%= ENV['APP_USER_POSTGRES_PASSWORD'] %>
Short and quick solution if you are running a Rails version > 4.2 Run the following command:
spring stop
..then run rails console or other rails command. My issue was that Spring server needed to be restarted in order to refresh/pickup my new ENV vars. I was starting up Rails console and it couldn't see them until I shut down Spring.
Previous versions of Rails didn't have this issue since they didn't use Spring server.
Another tool to help you troubleshoot -- Use the following command to print out your database.yml config. You can run it from the command line, but I prefer to run this within Rails console since then you can use awesome_print to make it pretty:
Within rails console:
puts ActiveRecord::Base.configurations
...or using awesome_print
ap ActiveRecord::Base.configurations
Or instead from the command line:
bin/rails runner 'puts ActiveRecord::Base.configurations'
Currently I get the following error:
PGError (FATAL: password authentication failed for user "postgres" ):
when my app tries to access the database.
I wanted to test my SQL calls against postgres as my app regular breaks when pushed up to production on Heroku because of the stricter requirements of postgres (which I think is probably a healthy thing) over sqlite 3. So I have a similar request to this for a not out of date tutorial for installing postgres for use with ruby on rails on windows (7) please. I thought it'd be a quick 20 minutes of downloading and installing but 2 and a bit hours later and I don't think I'm very close yet. So far I've:
Downloaded and installed Postgres Version 8.4.8-1 from here
Set my environment variables such that Path (for User) is: C:\Ruby192\bin;C:\Program Files (x86)\PostgreSQL\8.4\bin
Gemfile:
gem 'pg', '0.11.0' # instead of gem 'sqlite3', '1.3.3'
ran bundle install for my rails app seemingly successfully, but haven't found easy way to validate installation yet.
set database.yml as suggested here to:
development:
adapter: postgresql
database: db/development
username: postgres
password: secret
host: localhost
encoding: UTF8
pool: 5
timeout: 5000
I know I need to set up a user name and password for Postgres, maybe also start the postgres server, connect to it(?) and put in my local IP address I'll connect to it on into a config files somewhere and then edit one of the other .conf files in 'C:\Program Files (x86)\PostgreSQL\8.4\data' etc...
I think Rails has made me soft, am I over thinking things or is it actually fairly tricky to set up and I should just go back to Sqlite3, for which there's also the awesomely useful SQLite Manager, Firefox plugin?
I'm still searching for a beginners guide to installing and using Postgres for rails but so far have only been confused by most of the stuff I look at / tried following like this, this, this, this, this(for Snow Leopard), this(linux).
Any pointers would be much appreciated. Thanks!
James
An approach to installing Postgres on windows 7 for use as PostgreSQL database for a rails 3 (3.0.7) project.
Preamble (you can skip this bit)
So the first thing to point out is that Postgres is not just a different file extension from .sqlite3, it's a whole mechanism for managing your databases. As such it has a client/server model, of which you'll need to set up both to use Postgres as the database for your rails app.
Motivation for going through considerable pain of Postgres setup versus almost effortless sqlite setup: if you're deploying to Heroku, they're currently using Postgres so some of your SQL calls that are fine on sqlite3 will break when used with Postgres. It's much easier to debug postgres locally rather than when it's on Heroku's servers.
So I did the following things:
(Disclaimer: I may have forgotten to include some of the things I did... it took me over 48 hours of on and off pain to get it to work... if the following advice doesn't work for you then the huge (2300 pages!!) but very thorough Postgres documentation should help. I'd recommend downloading this anyway if you're serious about using Postgres as it has a lot of material that I've only just begun to understand the significance of.)
(Second disclaimer: I have almost certainly broken 20 sensible Postgres guidelines and exposed security holes in the Postgres database whilst doing so. If there any obvious things an experienced Postgres user disagrees with, please edit my post.)
.Step 1. Download and install PostgreSQL v9.0.4-1 from here because here said only 9.0.x would be supported on windows 7. I kept all the default options and just used 'secret' as the password when prompted by the Postgres installer for one (again not entirely sure what the consequences of sharing that info on the internet is... will soon find out I'm sure). You'll need this password in step 3.
.Step 2. Change environment variables such that Path (for system, not user (I'm not sure if this is significant or not)) is: C:\Program Files\PostgreSQL\9.0\bin
(n.b. I'm on 64-bit windows hence it not being installed for 32-bit in 'C:\Program Files (x86)\PostgreS...')
Don't forget to change access rights to folder PostgreSQL\9.0 and remove any default readonly rights on the folder or content.
(You may also need to restart your computer for these to take effect - thanks #Gavin -although not likely).
.Step 3. Test Postgres installation by trying to create a new database:
From command line: createdb -U postgres mydb_as_postgres.
You should be prompted to enter the password now, if you're not it may be that you need to start the server first (I can't remember whether I needed to do this or not). The easiest way is through pgAdmin III, which should be 'pgAdmin3.exe' in a folder somewhere like C:\Program Files\PostgreSQL\9.0\bin. Once you've started pgAdmin III there should be a panel on the left called 'Object Browser'. In this there should be a tree with:
Server Groups > Servers > PostgreSQL 9.0 (localhost:5432)
Right click on 'PostgreSQL 9.0 (localhost:5432)' and select 'Connect'.
The createdb -U postgres mydb_as_postgres command should create a new databse called 'mydb_as_postgres' which you can check by firing up pgAdmin III and double clicking on 'PostgreSQL 9.0 (localhost:5432)'. Under this there should be:
Databases (2) which should list 2 databases called mydb_as_postgres and postgres
I called it _as_postgres because the -U postgres part of the command tells Postgres to create the database with the postgres user as it's owner, which you need to specify when you're not signed in as the postgres user. I have all of my files stored as 'AJames' user though so if you're the same and want to keep developing your app when signed in as a different user you need to create a Postgres 'role' for that user now (see step 4).
.Step 4. Through pgAdmin III. Right-click on Login Roles (which for me is in):
Object Browser > Server Groups > Servers > PostgreSQL 9.0 (localhost:5432) > Login Roles
Right-click on Login Roles and select 'New Login Role...'
in Role name, put in your operating system user name, which for me is AJames,
and fill in your password under the 'Role Privileges' tab, I checked all the boxes, but an experienced postgres user would likely strongly recommend to only check the 'inherits rights from parent roles' and the 'can create database objects' But I'm not an experienced user and just want to debug Rails SQL calls in Postgres so I also checked the 'Superuser' and 'Can create roles', just in case.
.Step 5. You should now be able to create a new database without being signed in as the postgres user. Try typing:
createdb mydb_as_user
Hopefully this should work for you.
.Step 6. Okay, so you've got a development.sqlite3 file in your rails 'db/' directory. Initially I was going to set the next test as converting this from sqlite3 to psql.
I couldn't get this to work though but I left my attempts here as the solution I used required having the data in a Rails app on Heroku.com (see instead the solution from step 7 onwards). For those who only have a local app and no data in Heroku, they can't use the same approach, so they might need to explore something like this:
x6.1 First, test 'psql' by trying a command from your command line like:
psql mydb_as_user
this should display something like below (after you've typed in your password):
C:>psql mydb_as_user
Password:
psql (9.0.4)
WARNING: Console code page (850) differs from Windows code page (1252)
8-bit characters might not work correctly. See psql reference
page "Notes for Windows users" for details.
Type "help" for help.
mydb5=#
x6.2 try entering:
CREATE TABLE users_table (id integer, "name" text);
It should display:
CREATE TABLE
mydb5=#
If you check in pgAdmin III, you should see the table there under:
Object Browser > Server Groups > Servers > PostgreSQL 9.0 (localhost:5432) > Databases > mydb_as_user > Schemas > public > Tables > users_table >
x6.3 Okay, next to try the conversion. Downloaded sqlite-shell precompiled binary for windows.
x6.4 Create a new directory, I used 'C:\temp' and put the sqlite3.exe and your development.sqlite3 files in it.
x6.5 Use the following commands (which are from here) to dump the development.sqlite3 database into Postgres.
sqlite3 development .dump | psql development2
you might get an error like:
psql: FATAL: database "development2" does not exist
x6.6 so I went into pgAdmin III and made a development 2 database, tried the command again and got:
ERROR: syntax error at or near "PRAGMA"
LINE 1: PRAGMA foreign_keys=OFF;
^
BEGIN
COMMIT
Like I said, I couldn't get it to work. I'm sure there's a way of getting round that error but I thought of a different way and so I instead used this solution (which requires a Heroku account to have your data and does the conversion from sqlite3 to psql using the Taps gem (I believe):
.Step 7. in pgAdmin III I created another database. Under the properties tab I set name: 'development', owner: 'AJames' (replace this with your own Windows user name). And under the privileges tab, set role: 'public' and checked the ALL option (thought this resets to unchecked so I'm not sure that's necessary).
.Step 8. add
gem 'pg', '0.11.0'
to your gem file. You'll probably also want to remove the:
gem 'sqlite3'
at this point too.
.Step 9. set database.yml as suggested here to:
development:
adapter: postgresql
database: db/development
username: AJames # replace this with your own user name
password: secret # replace this with your own password
host: localhost
encoding: UTF8
pool: 5
timeout: 5000
If you are working on an open source project and don't want your password to be made publicly available, have a look at some of the answers to Securely providing the database password in a Rails app.
.Step 10. from command line in your rails app's root directory run:
rake db:migrate
This will create the new schema and all the tables in the Postgres database.
.Step 11. run heroku db:pull from your command line (again from in the root directory of your rails app) to pull all your data down and into your new empty Postgres database. I think at this point your taps gem will be doing this work for you.
.Step 12. Hopefully there is no step 12! ...and it should now be working for you. Happy RoR PostgreSQL debugging! Please edit, or let me know, if there are any errors in this.
Also, here's a list of additional stuff that might be interesting/useful:
This is a blog post about Postgres passwords, what they're for,
why you need them, how to change them etc.
This, under 'Creating a spatial database', is useful for newbies to
understand what pg_hba.conf is about and the second link that
Reno gave above, under the 'Using pgAdmin III GUI' is useful to
testing to see if postgres is actually working, before trying to fit
it with Rails (i.e. try creating a database and putting a table and
some data into it).
In the huge but very comprehensive Postgres documentation, I'd
start on page 58, 'I. tutorial'. Then on pdf page 431(!) there's
'Chapter 17. Server setup and operation' that I also found useful.
the answer from AJP is the correct one with just a small re-config.
The line
database: db/development
does not work for me.
I have to change it to
database: development
I use this for ruby on rails for the command
rake db:create
and
rake db:migrate
to work
None of your links appeared to be the (arguably) most useful documentation - the official postgresql docs. I recently configure a Linux Mint box with postgresql and django using a combination of those documents and these, though the latter are specific to Linux.
I'd worry more about validating the postgresql side of things, less about rails. That is to say, your question should be "How can I set up and test a postgresql server on a Windows 7 box", moreso than you need to know how to get it locked into rails.
Edit:
Maybe this could also be of use to you - official postgresql wiki with detailed installation guides.
Good luck!