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Commands used in the project:

To generate a polymorphic Comment's model:

$ rails generate model Comment commentable:references{polymorphic} body:text
$ rails generate controller Comments
$ rails generate controller Questions/Comments
$ rails generate controller Answers/Comments

To generate a polymorphic Vote's model:

$ rails generate model Vote votable:references{polymorphic} user:references
$ rails generate controller Votes
$ rails generate controller Questions/Votes
$ rails generate controller Answers/Votes

To modify the Comment's model to add a User ID column;

$ rails generate migration AddUserToComments user:references

To deploy on Heroku:

$ heroku create hackvan-flowoverstack
$ git push heroku master
$ heroku run rake db:migrate