Alias `rails` to `bin/rails` only inside a Rails directory

.zshrc

# Alias `rails` to `bin/rails` only inside a Rails directory

rails() {
  if [ -n "$(find . -maxdepth 1 -name bin -type d -exec test -e '{}/rails' ';' -print -quit)" ] && [ -e Gemfile ]; then
    bin/rails "$@"
  else
    command rails "$@"
  fi
}