Ruby on Rails

Hello, My name is Tyler DeLawder I am currently learning Ruby on Rails a friend of my Richard Ramsden showed me this site called railsforzombies.org I went on the site and registered and began the program.

You can check out Rick's blog here http://rramsden.ca/

Here are some examples of what I have learned so far in the program.

id	Name	Age
1	Tyler	19
2	Rick	24

Find Name where id = 1 and store it in a variable

So here is what I done.

> n = Name.find(1)

This returns

 

=> #<id: 1, name: "Tyler", age: 19">

 

Now notice I stored the variable as "n".

Now if you wanted to get something from the database, Let's say my Age we would do this.

 

> puts n[:Age]

We would get this.

 

=> 19

You can also write it like this in rails

 

>  puts n.Age

Now if you wanted to add to the database you would do.

 

Now note the Rails takes care of the id in the new database.

> t = Name.new
t.Name = "Yomi"
t.Age = "18"
t.save
To Update an existing item in the database you would do.
 
 
t = Name.find(2)
t.Name = "Steven"
t.save
 
And to delete an item in the database you would do.
 
 
t = Name.find(3)
t.destroy
We can also do this.
 
Name.find(3).destroy
 
And to delete all you can do
 
Name.destroy_all
 
We can also update the attributes by doing this.
 
 
t = Name.find(1)
t.update_attributes(
              :Age => "18"
              )

Lets look at our results.



id
Name
Age


1
Tyler
18


2
Steven
24


3
Yomi
18