Best development practices to follow

2016-09-09.md

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+Harshwardhan Singh Rathore
+==========================
+
+## Best Development Practices:
+1. Never rename or edit the migration file which already has been merged into master instead create new migration to alter the table schema.
+
+2. Don't use underscore in css class name, use hyphen instead. For example: `class-name` not `class_name`.
+
+3. Always use html class to apply styling using css, never use element id to apply styling in css.
+
+4. Prepend class-name or element id by js if it is being used to manipulate using Javascript.
+
+  For example: Use `js-element-id` or `js-class-name`  
+  Instead of: `element-id` or `class-name`
+
+5. (Rails) Always use ActiveRecord transactions to bind database calls while running multiple database operation.
+This will rollback all the changes to database if any one of the database query fails.
+~~~ruby
+ModelClass.transaction do
+  User.create!(email: params[:email], username: params[:username])
+  Profile.create!(email: params[:email], name: params[:name])
+end  
+~~~
+In above mentioned case if `User` create query succeeds but `Profile` create fails then the user created by `User.create!(email: params[:email], username: params[:username])`
+will be deleted. That's the beauty of using transactions that it rollbacks to the previous state if anything goes wrong.
+
+If you don't use transactions but want to achieve the same functionality then the code will look like this
+
+~~~ruby
+user = User.create!(email: params[:email], username: params[:username])
+profile = Profile.create!(email: params[:email], name: params[:name])
+
+unless profile do
+  user.destroy
+end
+~~~