Minitopics
http://bit.ly/1F6nm8L
PC
M
oncatenation
inification
re-compiliation
Today's stuff
- AJAX!!
- Deploying your app on Heroku
- Rails associations
- Project time
Update parts of a web page, without reloading the whole page.
Minitopic 1
User Experience :)
Cool huh!?
Ajax
everything!!
Ajax-ified?? (Yes, No, Maybe)
No
User Login
Comments on a Blog
Messaging System
Contact Us From
Yes
Yes
Maybe
Make your app available to the world! :)
Minitopic 2
We stand on the shoulders of giants
But wait!!!
To the rescue!!!
- Make sure your rails server is running
- ./ngrok <port-number>
- Go to url
- Your app live!!
ngrok
A little break
Rails associations
Minitopic 3
- An employee has many tasks
- A task belongs to one employee
Scenario: Employees can create tasks for themselves
Has Many, Belong To
Has Many, Belong To
Task.first.employee
Employee.first.tasks
- An employee has many tasks
- A task has many employees
Scenario: Tasks are assigned to a group of employees
has_and_belongs_to_many
Task.first.employees
Employee.first.tasks
has_and_belongs_to_many
Other examples
- A task has many tags. A tag has many tasks.
- An event has many attendees. Attendee has many events
has_and_belongs_to_many
- An employee has many tasks
- A task has many employees
Scenario: Tasks are assigned to a employees. But they are assigned at different times.
has_many :through
Task.first.employees
Employee.first.tasks
has_many :through
Other examples
- Patients make appointments to see physicians
- Students have classes with many teachers
has_many :through
Three associations today
- has_many, belongs_to
- has_and_belongs_to_many
- has_many :through
There's lots more!!
What did we just learn?
- AJAX!!
- Deploying your app on Heroku
- Rails associations