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Fantastic Errors and How to Fix Them

This is a repository for various spectacular and strange errors that don't have immeadiately obvious solutions. When you add to this doc, please include information on the following categories:

  • A description of the problem and any error messaging you were given
  • The process that was needed to fix the error
  • Any sources you consulted to develop a solution

PG::ConnectionBad

Error Message:

PG::ConnectionBad could not connect to server something something /tmp/.s.PGSQL.1234 (can’t connect to postgres, bad pid file)

Solution:
rm /usr/local/var/postgres/postmaster.pid
brew services restart postgresql
Sauces:

https://stackoverflow.com/questions/14225038/postgresql-adapter-pg-could-not-connect-to-server

Error Message:

PG::ConnectionBad could not connect to server Is the server running on host something and accepting TCP/IP connections on port something?

Solution:

This may be caused by a mismatch of versions between the database and the current version of postgres.

brew services list

//check the plist for postgres for the logfile path usually found at
less /usr/local/var/log/postgres.log

//if the log says we have a newer version of postgres you can check to see what the right way to update the database is by checking
brew info postgresql

//look in caveats for migration instructions. currently: 
brew postgresql-upgrade-database

Permissions Issues with rbenv and Brew

You can fix permissions issues by:

# Fix permissions issues on Homebrew
sudo chown -R $(whoami) $(brew --prefix)/*

You can then use brew doctor to see issues brew detects and run any suggested commands to fix them.

Reinstalling XCode Command Line tools

Sometimes Xcode updates erronously and you get the message: gyp: No Xcode or CLT version detected macOS Catalina

If you see something similar when running yarn (the template runs this when you start a new rails app), you can fix it by:

  1. Find where command line tools are installed with xcode-select --print-path
  2. For me it was /Library/Developer/CommandLineTools and I removed it with: sudo rm -r -f /Library/Developer/CommandLineTools
  3. Then reinstall them with the command: xcode-select --install

After it’s installed you can use yarn and other tools to set up Rails applications etc.

Heroku Using GET rather than POST

Error Message:

"The page you are looking for doesn't exist"

Solution:

This is what the problem looks like:

/app/assets/javascripts/application.js

// Read Sprockets README (https://github.com/rails/sprockets#sprockets-directives) for details
// about supported directives. //= require jquery3
  //= require popper
  //= require bootstrap-sprockets

There is a missing newline. Corrected code looks like this:

/app/assets/javascripts/application.js

// Read Sprockets README (https://github.com/rails/sprockets#sprockets-directives) for details
// about supported directives. 
  //= require jquery3
  //= require popper
  //= require bootstrap-sprockets

However, the problem is in the .rails-template

.rails-template.rb
inject_into_file "app/assets/javascripts/application.js", after: "// about supported directives.\n" do

add the newine after // about supported directives.