1
00:00:00,554 --> 00:00:04,390
I've added the plain Ruby method
called page content to the app.

2
00:00:04,390 --> 00:00:06,750
You can type in the code
you see here if you want.

3
00:00:06,750 --> 00:00:09,150
But if you launch a workspace
from this video's page,

4
00:00:09,150 --> 00:00:11,820
you'll get a workspace with this
method already set up for you.

5
00:00:12,840 --> 00:00:16,110
The page content method loads
the contents of a text file and

6
00:00:16,110 --> 00:00:18,020
returns them as a string.

7
00:00:18,020 --> 00:00:21,230
You pass the title of a page
to it as an argument and

8
00:00:21,230 --> 00:00:24,660
it uses the read method on
the core Ruby file class to open

9
00:00:24,660 --> 00:00:29,630
a .txt file from a pages sub directory
within your apps main directory.

10
00:00:29,630 --> 00:00:33,430
Check the teacher's notes if you'd like
to know more about the file.read method.

11
00:00:33,430 --> 00:00:39,140
If the file isn't found, file.read will
raise this Errno ENOENT exception.

12
00:00:39,140 --> 00:00:43,190
So we put this rescue clause here that
will intercept that error if it happens

13
00:00:43,190 --> 00:00:44,160
and just return nil.

14
00:00:45,250 --> 00:00:47,790
So if the file isn't there,
we just won't get anything back.

15
00:00:48,960 --> 00:00:52,930
Now we need the page's sub directory
with text file for it to load from.

16
00:00:52,930 --> 00:00:54,260
So I'll create it in folder.

17
00:00:57,380 --> 00:00:58,370
Name it pages.

18
00:01:00,090 --> 00:01:01,926
And then create a new file within it.

19
00:01:04,679 --> 00:01:08,010
This file will hold a bio for one of
our Treehouse teachers, Nick Pettit.

20
00:01:08,010 --> 00:01:11,524
So I'll name it Nick Pettit.txt.

21
00:01:14,231 --> 00:01:17,803
The file name has to end with a .txt
extension because that's what the page

22
00:01:17,803 --> 00:01:20,430
content method will be looking for.

23
00:01:20,430 --> 00:01:27,460
For the file contents, I'll just put
Treehouse teacher and game developer.

24
00:01:30,040 --> 00:01:33,910
Now let me copy this page content
method to a new file all by itself, so

25
00:01:33,910 --> 00:01:35,910
I can show you how it works.

26
00:01:35,910 --> 00:01:39,170
We'll create a new file, name it test.rb.

27
00:01:41,290 --> 00:01:44,680
There's no need to require the Sinatra
library since it's not used by any

28
00:01:44,680 --> 00:01:45,200
of this code.

29
00:01:46,270 --> 00:01:49,270
Now I'll add a call to the method and
print the return value.

30
00:01:49,270 --> 00:01:56,930
So put this page content and
we'll get an argument of

31
00:01:56,930 --> 00:02:02,190
Nick Pettit, that's the name of the text
file without the txt extension.

32
00:02:03,450 --> 00:02:07,580
I didn't include the .txt on the end
because page content adds that itself.

33
00:02:08,650 --> 00:02:10,930
If you launch the workspace
that comes with this video,

34
00:02:10,930 --> 00:02:13,310
we'll ensure all that's set up for you.

35
00:02:13,310 --> 00:02:15,418
Now let's go to our console and
try running this.

36
00:02:15,418 --> 00:02:21,260
Ruby space test.rb and they'll load the
contents of the text file and print them.

37
00:02:22,460 --> 00:02:25,360
Don't worry if you don't understand
every detail of how the page

38
00:02:25,360 --> 00:02:26,830
content method works.

39
00:02:26,830 --> 00:02:29,285
That's just what we're using for
this particular app and

40
00:02:29,285 --> 00:02:31,890
it's not essential to
understanding Sinatra.

41
00:02:31,890 --> 00:02:34,210
There's more info in the teacher's
notes if you want it.

42
00:02:35,770 --> 00:02:39,350
We don't have any further need for
the test our ,rb file right now.

43
00:02:39,350 --> 00:02:41,820
So I'm going to delete
it from my workspace.