Sarun Sermsuwan questions

• merge some complex hashes in ruby
• put a left margin on a background image
• Rails: How to cancel current statements in rails console?
• clear all variables in rails console
• MySQL: Spatial Query to find whether a latitude/longitude point is located within a given boundary
• How to use the "self" keyword in Rails
• dot sign's meaning in git checkout command
• rails active record: update a table with join
• sqlite3 - how to list out database name using .databases command?
• Reload the rails console

Sarun Sermsuwan answers