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So when we last left off we had just
created this inventoryable module, and

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we're going to use that in all of
our different product classes.

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So let's go ahead and
first off we're just going to include it

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in the shirt class, and
that'll be a good start.

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So now, let's go ahead and
make a couple of attribute methods for

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setting the stock status of an item.

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00:00:28,720 --> 00:00:32,830
So we want to be able to say,
okay this is how many

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units are in stock for a shirt,
a pair of pants, an accessory, whatever.

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Now we're gonna define this
method called stock_count,

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and stock count is going to
work very similarly to our

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instances class method that we used
over in the extend tracking module.

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So we're just going to
conditionally set it to zero.

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Now what this is going to do is
initialize a variable called stock_count,

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and set it to zero if it
does not already exist.

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If it does exist,
the variable will be returned.

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Now because we've done that we also
need something to set the stock count.

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So we define a method called
stock_count=(number), and

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then we'll just say the stock count
now equals the number not zero.

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So let's go ahead and
test this out really quickly.

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We'll say shirt1.stock_count = 10.

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Now we can print these both out.

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And we'll say shirt1.stock_count,
and we're going to copy and

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paste that line and
we're going to say Shirt 2 stock count,

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and we should see ten and
zero if we run this.

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And we do, and
that's exactly what we want.

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00:02:16,050 --> 00:02:20,670
So when we put a new item in
the inventory, if we don't explicitly

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set the stock count we're going to
think that we have zero in stock.

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And this makes sense.

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So now let's go ahead and
write another method to see whether or

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not something is in stock.

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And we're going to say it's in stock if
the stock count is greater than zero.

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And we don't need to replay these,
but we'll go ahead and

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just say shirt one in stock.

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And the same thing for Shirt 2.

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And that looks pretty good.