Hey there, let's break down what's going on here and how to get it sorted!

What's Causing the Error? #

The syntax error you're hitting:

/var/lib/gems/2.2.0/gems/iex-ruby-client-1.1.0/lib/iex/endpoints/chart.rb:14: syntax error, unexpected '.' (SyntaxError)
options&.each_pair do |k, v|

is directly tied to your Ruby version. The &. (safe navigation operator) is a feature introduced in Ruby 2.3, but your system is running Ruby 2.2.0—you can see this from the /var/lib/gems/2.2.0/ path in the error message. Your Rails app works because it's almost certainly using a newer Ruby version (managed via rbenv, rvm, or Rails' default setup) that supports this syntax.

Solutions to Try #

1. Upgrade Your Ruby Version (Recommended)

This is the cleanest long-term fix. Ruby 2.2 is no longer supported, so upgrading to Ruby 2.3 or higher (like 2.7, 3.0, or a current stable release) will let you use the latest iex-ruby-client without compatibility issues. Use a version manager to make this easy:

• rbenv: Install a newer version with rbenv install 2.7.8 (or a more recent stable release) and set it as your global version with rbenv global 2.7.8
• rvm: Install via rvm install 2.7 and switch to it with rvm use 2.7

2. Downgrade the iex-ruby-client Gem

If you can't upgrade Ruby right now, install an older version of the gem that doesn't rely on Ruby 2.3+ syntax. Look for versions released before the safe navigation operator was added to the gem. For example:

gem install iex-ruby-client -v 0.10.0

If you're using Bundler, add this to your Gemfile:

gem 'iex-ruby-client', '~> 0.10.0'

Then run bundle install to lock in the compatible version.

3. Double-Check Your Configuration Setup

While version compatibility is the main issue, make sure your plain Ruby script is structured correctly:

1. First require the gem and your config file in stock.rb:

# stock.rb
require 'iex-ruby-client'
require './iex_config' # Replace with the actual path to your config file

# Test the API to confirm it works
stock = IEX::Stock.new('AAPL')
puts stock.price

2. Ensure your config file (with the IEX::Api.configure block) is loaded after requiring the gem.

内容的提问来源于stack exchange，提问作者goodjobbin85