Andrew Haines questions

Andrew Haines answers

• Errors from `ObjectSpace._id2ref`
• how to use rspec to mock a class method inside a module
• How to set the value to null through rails model?
• Ruby puts string and integer on same line
• How do `Hash#reject!` and `Hash#reject` differ from `Hash#delete_if`?
• Evaluate javascript on Ruby
• Ruby regex for text within parentheses
• Rails deprecation warning for vendor/plugins when I don't have any [duplicate]
• Product orders between 2 users
• Better way to write @instances.count > 0