Rails Best Practices
When you generate a new migration, try it forwards and backwards to ensure it has no errors
Memoization is an optimization technique used primarily to speed up computer programs by having function calls avoid repeating the calculation of results for previously-processed inputs. In rails, you can easily use memoize which is inherited from ActiveSupport::Memoizable.
Observer serves as a connection point between models and some other subsystem whose functionality is used by some of other classes, such as email notification. It is loose coupling in contract with model callback.implemented
the routes will become complicated with the growth of your application, contain different namespaces, each with a lot of resources and custom routes, it would be better to split routes into different files according to the namespaces, which makes it easy to maintain the complicated routes.
N+1 Queries is a serious database performance problem. Be careful of that situation! If you're not sure, I recommend you install http://github.com/flyerhzm/bullet plugin, which helps you reduce the number of queries with alerts (and growl).
Are you tired of going to schema.rb to find your table structures information? It would be better to list all the attributes of the model in the model itself.
It's very common for a rails developer to use time_ago_in_words to display time like "5 minutes ago", but it's too expensive to calculate the time in server side, you should utilize client cpu to calculate the time ago.implemented
In partial view, we can use the instance variable directly, but it may be confused and make it hard to reuse anywhere, because we don't know exactly which instance variable can be used, so use the local variable in partial with explicitly assignment.implemented
According to the law of demeter, a model should only talk to its immediate association, don't talk to the association's association and association's property, it is a case of loose coupling.implemented