Go back and remove repetitive method use
(item.item) and utilize "all" method

Add more edge case testing at end

Looking over the reading for chapters pertaining to "Dependency Injection" and also "Duck Typing"

look into module

seems to be a number of functions that find all X objects with high/low X feature.

we can probably write a flexible function that works for all of these cases.

What is it? How to do

include the "require" bits

Send over whenever just so I can add for portfolio

Colin, fix your shit

1. Iteration 1 Merchants #items returns associated items
   Failure/Error: expected = merchant.items
   NoMethodError:
   undefined method `find_all_by_merchant_id' for nil:NilClass

   /Users/kerrysheldon/turing/1module/projects/black_thursday/lib/merchant.rb:13:in`items'

   ./spec/iteration_1_spec.rb:10:in `block (3 levels) in <top (required)>'

2. Iteration 1 Sales Analyst #average_items_per_merchant_standard_deviation returns the standard deviation
   Failure/Error: expected = sales_analyst.average_items_per_merchant_standard_deviation
   NoMethodError:
   undefined method `average_items_per_merchant_standard_deviation' for #SalesAnalyst:0x007fb50a11e768
   Did you mean? average_items_per_merchant

   ./spec/iteration_1_spec.rb:45:in`block (3 levels) in <top (required)>'

3. Iteration 1 Sales Analyst #average_item_price_for_merchant returns the average item price for the given merchant
   Failure/Error: expect(expected).to eq 16.66

   expected: 16.66
        got: 16.656666666666666666666666667 (#<BigDecimal:7fb50a264438,'0.1665666666 6666666666 666666667E2',36(45)>)

   (compared using ==)
 # ./spec/iteration_1_spec.rb:61:in `block (3 levels) in <top (required)>'

4. Iteration 1 Sales Analyst #average_average_price_per_merchant returns the average price for all merchants
   Failure/Error: expect(expected).to eq 350.29

   expected: 350.29
        got: 350.294697495132463357977937150568421052631578947 (#<BigDecimal:7fb50a2a4010,'0.3502946974 9513246335 7977937150 5684210526 31578947E3',54(63)>)

   (compared using ==)
 # ./spec/iteration_1_spec.rb:68:in `block (3 levels) in <top (required)>'

Big Decimal