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Stock Counts

3:10 with Jason Seifer

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 1:25
    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. 1:46
    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. 2:32
    And we're going to say it's in stock if the stock count is greater than zero. 2:37
    And we don't need to replay these, but we'll go ahead and 2:46
    just say shirt one in stock. 2:49
    And the same thing for Shirt 2. 2:57
    And that looks pretty good. 3:08

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