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You attempted to start up a server, only to be confronted with the following error:

Address already in use - bind(2) for "0.0.0.0" port 3000 (Errno::EADDRINUSE)

What do you do?

1. Figure out what service is using that address port.

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To access the rails console in a docker container, run:

docker-compose run web rails console

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So, you just cloned an existing project's repo and you run bundle install but you got the error: rbenv: version x.x.x is not installed....

What the issue means? The project uses a specific ruby version that you do not have on your system.

Here's how to fix it:

• Install the Ruby build for the specified version using:

rbenv install x.x.x

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Step 1 - Create a Backup and Download it

heroku pg:backups:capture
heroku pg:backups:download

Step 2 - Using pg_restore command

pg_restore --verbose --clean --no-acl --no-owner -h localhost -U username -d development_dbname ~/Downloads/blah1234blah789

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Ref: https://stackoverflow.com/questions/24622568/rails-generate-model-hangs

So, I ran into a mysterious situation where running a rails g migration ... command on my terminal freezes/hangs for a really long time.

Running ps aux | grep spring gave me a clue into what was going on.

I got the following:

esther 4201 0.0 0.0 2480224 2692 ?? S 6Sep17 0:00.82 spring server | panacea | started 191 hours ago

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This is useful for when debugging your tests.

Option 1:

puts page.body

Option 2:

save_and_open_page

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Today I learnt about jq - "a lightweight and flexible command-line JSON processor".

One of the use cases is pretty-printing JSON response on the terminal.

It essentially makes JSON data more readable on your terminal. If you work with a lot of JSON data on your terminal, you need to install jq.

Before jq:

$ curl localhost:3001/api/food?q=hash+browns

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I have multiple verstions of rails and ruby gems on my machine and I ran into the error below when I tried to run any rails command such as rails -v, rails new new_app, etc.

.../ruby/2.3.0/rubygems/specification.rb:2274:in `check_version_conflict': can't activate activesupport-5.1.0, already activated activesupport-5.0.1 (Gem::LoadError)

Here's how I fixed it.

The version conflict points to ActiveSupport so I ran the command below to check the different versions of activesupport on my machine:

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I had a challenge with pushing to another heroku account from my command line...

These are the steps I took to fix the error (redacted) below:

 !  Your account xxx@gmail.com does not have access to xx-heroku-app.
 !
 !  SSH Key Fingerprint: xx:xx:xx...

fatal: Could not read from remote repository.

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If you're installing puma version below 3.7 or 3.8, because puma requires openssl, you'll get the following error when you attempt to install the puma gem either directly or from a Gemfile:

Building native extensions.  This could take a while...
ERROR:  Error installing puma:
	ERROR: Failed to build gem native extension.

    current directory: /Users/esther/.rbenv/versions/2.3.0/gemsets/contagious/gems/puma-2.6.0/ext/puma_http11
/Users/esther/.rbenv/versions/2.3.0/bin/ruby -r ./siteconf20170830-2950-8i5exi.rb extconf.rb
creating Makefile