Alan Coromano questions

• MongoDb - "join" or $in two collections
• Adding a validation error in a controller in Rails 4
• Android XML Naming convention [duplicate]
• .gitignore Doesn't Seem To Work
• Insert into (...) - can I use "format" instead of "%s" in Python3?
• Need to recompile assets in Rails in case of change. How do I get rid of it?
• Padding left for a text in Prawn
• Extracting json in Scala
• Testing ruby script
• a right-associative triple colon operator

Alan Coromano answers