If you have all your code repos under a common directory, you can make it so changing your working directory to any of the repos is just entering the name of the repo.

For example, all my code repos are under ~/code:

~ > ls ~/code
bar    foo

By adding a loop for the sub-directories of the common parent inside your shell config, ~/.zshrc in my case, you can automatically create a alias for each of the repo directories:

for repo in $(ls ~/code)
do
  alias $repo="cd ~/code/$repo"
done

Then you need to reload your config:

~ > . ~/.zshrc

Now, if you're in one repo, lets say foo:

~/code/foo/app/models >

You can easily swap over to bar:

~/code/foo/app/models > bar
~/code/bar >