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[MUSIC]

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Our users can view pages
that we've created for them.

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But a major feature of
a wiki is the ability for

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users to create their own pages.

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And they can't do that yet.

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So let's fix that.

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Our next task is to set up a form for
new pages.

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First thing we're going to need is
the ability to save text files with

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the contents of new pages.

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We already have the page content
method that takes a page title and

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uses it to load the contents of
a text file in the pages directory.

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I've added another method
called save_contents to the app

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which saves a file to the pages directory.

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Again if you launch a workspace
from this video's page,

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you'll get an updated wiki .rb file
with this method already set up for you.

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The save_content method takes
two strings as parameters.

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The first string holds the page title and

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the second holds the page content,
save_content calls the core rubyfile.open

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method to open a file
in the pages directory.

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It uses the title string as a filename and
adds an extension of the .txt.

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The string w in the second argument tells
the method to open the file in write mode.

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File.open takes a block and

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passes an object representing the open
file to the block as a parameter.

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Within the block,

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we can call the print method on the file
object to write strings to the file.

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So we simply call print and write the
entire page contents to the file at once.

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When the block finishes,
control returns to the file.open method

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which closes the file for
us automatically.

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Just like before,

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I'll copy the save content method to a new
file to show you how it works by itself.

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I'll create a test.rb file again.

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And paste this method in there.

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Then I'll add a call to it which will
create a page titled Ben Deitch.

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So we'll call save_content.

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First argument is the title, Ben Deitch.

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Second argument is the page
content which will just say,

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Treehouse Android teacher.

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Let's save this and
then go to our console and try running it.

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Ruby test.rb.

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If we right click in the sidebar and
choose refresh,

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we'll see a new file in the pages
directory called Ben Deitch.txt.

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And that file will have the contents
that we specified when we called

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the save_content method.

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We can also use save_contents
top update existing files.

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Let's change the method call to
update our Nick Pettit.txt file.

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We'll set the title in our
method call to Nick Pettit.

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And we'll change the content in the file
to Treehouse teacher and awesome guy.

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Save that and now, we can go to
the console and run the script again.

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Then if we open Nick Pettit.txt,
we'll see our updated content.

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As before,

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we should delete the test.rb file when
we're done to keep our project clean.

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Again, understanding the save_content
method isn't essential to understanding

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Sinatra.

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But there's more info in
the teacher's notes if you want it.

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So we've got a method that can take
a wiki pages data and save it for us.

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Now we're going to need an HTML form
that lets users enter that data.

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We'll look at that next.