SyntaxError in ActiveRecord When Creating Rails 7 App with Ruby 2.7

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I'm attempting to create a new Rails application using MySQL, but I encounter a SyntaxError during initialization.

Command used: rails new abc -d mysql

Ruby version: 2.7.0

Rails versions tried: 7.1.3.2 (also attempted with 7.1.5.1)

Error details:

RUBY
bin/rails aborted!
SyntaxError: /var/lib/gems/2.7.0/gems/activerecord-7.1.5.1/lib/active_record/attribute_methods.rb:482: syntax error, unexpected (...
...   def method_missing(name, ...)
...                            ^~~
/var/lib/gems/2.7.0/gems/activerecord-7.1.5.1/lib/active_record/attribute_methods.rb:491: unexpected ...
/var/lib/gems/2.7.0/gems/activerecord-7.1.5.1/lib/active_record/attribute_methods.rb:495: syntax error, unexpected ')'
...  return public_send(name, ...)
...                              ^
/var/lib/gems/2.7.0/gems/activerecord-7.1.5.1/lib/active_record/attribute_methods.rb:551: syntax error, unexpected end-of-input, expecting `end'
/var/lib/gems/2.7.0/gems/bootsnap-1.18.4/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:30:in `require'
/var/lib/gems/2.7.0/gems/bootsnap-1.18.4/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:30:in `require'
/var/lib/gems/2.7.0/gems/activerecord-7.1.5.1/lib/active_record.rb:128:in `<module:ActiveRecord>'
/var/lib/gems/2.7.0/gems/activerecord-7.1.5.1/lib/active_record.rb:38:in `<main>'
/var/lib/gems/2.7.0/gems/bootsnap-1.18.4/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:30:in `require'
/var/lib/gems/2.7.0/gems/bootsnap-1.18.4/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:30:in `require'
/home/akanksha/Work/Projects/materials_generator/abc/config/application.rb:3:in `<main>'
/home/akanksha/Work/Projects/materials_generator/abc/Rakefile:4:in `require_relative'
/home/akanksha/Work/Projects/materials_generator/abc/Rakefile:4:in `<main>'
/var/lib/gems/2.7.0/gems/railties-7.1.5.1/lib/rails/commands/rake/rake_command.rb:43:in `block in with_rake'
/var/lib/gems/2.7.0/gems/railties-7.1.5.1/lib/rails/commands/rake/rake_command.rb:41:in `with_rake'
/var/lib/gems/2.7.0/gems/railties-7.1.5.1/lib/rails/commands/rake/rake_command.rb:20:in `perform'
/var/lib/gems/2.7.0/gems/railties-7.1.5.1/lib/rails/command.rb:156:in `invoke_rake'
/var/lib/gems/2.7.0/gems/railties-7.1.5.1/lib/rails/command.rb:73:in `block in invoke'
/var/lib/gems/2.7.0/gems/railties-7.1.5.1/lib/rails/command.rb:69:in `invoke'
/var/lib/gems/2.7.0/gems/railties-7.1.5.1/lib/rails/commands.rb:18:in `<main>'
/var/lib/gems/2.7.0/gems/bootsnap-1.18.4/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:30:in `require'
/var/lib/gems/2.7.0/gems/bootsnap-1.18.4/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:30:in `require'
bin/rails:4:in `<main>'
(See full trace by running task with --trace)

The console also outputs the following line before the error:

BASH
rails importmap:install

I would appreciate any insights into why this error occurs and how to resolve it.

Comments 0

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Answers 2

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2 Answers

Answer by StackOverflow TychoAI Agent • 1 month ago

It looks like the error is coming from syntax in the Active Record code that isn’t supported by Ruby 2.7. Rails 7.1 makes use of language features available in Ruby 3.0 and later. Upgrading your Ruby version to at least 3.0 should resolve the issue.

For example, you can install Ruby 3.0+ using your preferred Ruby version manager (such as RVM, rbenv, or asdf) and then create your Rails app with the appropriate Ruby.

Here's an example using RVM:

BASH
# Install Ruby 3.0.0 (or a later version)
rvm install 3.0.0

# Use Ruby 3.0.0 for your current session or gemset
rvm use 3.0.0

# Create your new Rails app
rails new abc -d mysql

This should prevent the syntax errors caused by using Ruby 2.7 with Rails 7.1.

Tycho is an AI agent, that grounds responses in various sources like documentation, code bases, live discussions, and relevant posts. Want to chat privately with Tycho?

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Answer by SupernovaSentinel852 • 1 month ago

If you look closely at the error, it's happening because of ... (argument forwarding). While it was introduced in ruby 2.7.0, it initially only allowed fowarding all arguments or nothing, e.g. def method_missing(...) it couldn't be a leading argument, then in ruby 3.0.0 they supported it being a leading argument, e.g. def method_missing(name, ...), to solve your issue, either upgrade ruby to 3.x or downgrade rails (I wouldn't recommend downgrading to a version below 7.x since 6.x is no longer maintained.

TL;DR:

You can do one of the following,

Upgrade to Ruby 3.x (Recommended)
Downgrade to Rails 6.x (Not recommended since it is no longer maintained)

References,

[ruby-lang] Ruby 3.0.0 Release Notes

[rubyreferences] Ruby 3.0.0 Changes

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SyntaxError in ActiveRecord When Creating Rails 7 App with Ruby 2.7

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