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In this video, we begin to implement our inventory stock counts.
Code Samples
We set up a couple of helper methods in our Inventoryable class to keep up with stock counts:
module Inventoryable
def stock_count
@stock_count ||= 0
end
def stock_count=(number)
@stock_count = number
end
def in_stock?
stock_count > 0
end
end
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So when we last left off we had just
created this inventoryable module, and
0:00
we're going to use that in all of
our different product classes.
0:04
So let's go ahead and
first off we're just going to include it
0:09
in the shirt class, and
that'll be a good start.
0:14
So now, let's go ahead and
make a couple of attribute methods for
0:20
setting the stock status of an item.
0:25
So we want to be able to say,
okay this is how many
0:28
units are in stock for a shirt,
a pair of pants, an accessory, whatever.
0:34
Now we're gonna define this
method called stock_count,
0:41
and stock count is going to
work very similarly to our
0:48
instances class method that we used
over in the extend tracking module.
0:53
So we're just going to
conditionally set it to zero.
1:00
Now what this is going to do is
initialize a variable called stock_count,
1:07
and set it to zero if it
does not already exist.
1:12
If it does exist,
the variable will be returned.
1:15
Now because we've done that we also
need something to set the stock count.
1:20
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.
1:31
So let's go ahead and
test this out really quickly.
1:38
We'll say shirt1.stock_count = 10.
1:41
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
1:54
paste that line and
we're going to say Shirt 2 stock count,
2:00
and we should see ten and
zero if we run this.
2:05
And we do, and
that's exactly what we want.
2:12
So when we put a new item in
the inventory, if we don't explicitly
2:16
set the stock count we're going to
think that we have zero in stock.
2:20
And this makes sense.
2:24
So now let's go ahead and
write another method to see whether or
2:28
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.
2:57
And that looks pretty good.
3:08
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