Currently, the collection class is abstract and

it implements the CollectionInterface.

All methods from the interface are being implemented in the collection class.

Let's add one more method to that interface.

We'll call this public function getTitle.

Now let's preview our site again.

We get another error like we've seen before because we have not

implemented our required method.

But let's take a closer look at that error.

First, notice that the error is on the post class, not on the collection class.

The next part of the error explains why.

The abstract method must either be implemented or

the class itself may be declared abstract.

Because the collection class is abstract.

And therefore cannot be instantiated,

it is not required to implement all the required methods itself.

Instead, this requirement is passed to any non-abstract class,

extending the collection class.

Let's add this method to the post class.

Public function getTitle.

First, if this count is equal to 1,

This means that we're on a single post page.

If we're on a single post page, we want to return the current title.

If we make it past this return, we'll simply return Latest Posts.

Let's clean up our pages.

In header.php, in our views folder, We used the title twice.

Let's replace those with this new method instead, content getTitle.

Now we can remove the title from the index page.

Since we don't need to set the title, we can make this a single if statement.

So, if our content is not set or

the content count is not equal to 1, or,

The content current status does not equal published.

Then we will select all posts.

Once again,

let's preview the site to make sure everything is still functioning properly.

Looks good.

We're ready to add a second content type for

pages by extending a second child of the collection class.