Add new models and add _models.yml files and remove _sources files

fix _models file

Author: ElliotTaylor23

jaffle_shop/models/final/finance/_models.yml

@@ -0,0 +1,13 @@
+version: 2
+
+models:
+  - name: fnl_finance_customerreturnstotal
+    description: > 
+      This table gives one row per customer, with the total of their completed returns,
+      pending_returns and the sum of the 2
+    columns:
+      - name: customer_id
+        description: primary key
+        tests:
+          - unique
+          - not_null

jaffle_shop/models/final/finance/fnl_finance_customerreturnstotal.sql

@@ -0,0 +1,18 @@
+{% set return_states = ['returned', 'return_pending'] %}
+
+select 
+    custs.customer_id 
+
+    {% for return_state in return_states -%}
+    , SUM(payments.amount_dollars) FILTER (WHERE orders.status =' {{ return_state }}') AS {{ return_state }}_amount_dollars
+    {% endfor -%}
+    
+    , SUM(payments.amount_dollars) AS sum_return_amount_dollars
+
+from {{ ref('wh_orders') }} AS orders
+    left join {{ ref('wh_customers') }} AS custs
+        on custs.customer_id = orders.customer_id
+    left join {{ ref('stg_payments') }} AS payments
+        on payments.order_id = orders.order_id
+where orders.status IN ('returned', 'return_pending')
+GROUP BY customer_id

jaffle_shop/models/final/sales/_models.yml

@@ -0,0 +1,13 @@
+version: 2
+
+models:
+  - name: fnl_sales_newcustomerhistory
+    description: > 
+      This table gives one row per truncated month with the count 
+      of customers that have created their first order within this month
+    columns:
+      - name: first_order_month
+        description: primary key
+        tests:
+          - unique
+          - not_null

jaffle_shop/models/final/sales/fnl_sales_newcustomerhistory.sql

@@ -0,0 +1,4 @@
+select 
+    date_trunc('month', first_order) AS first_order_month
+    , count(*) AS number_customers
+from {{ ref('wh_customers') }}

jaffle_shop/models/intermediate/_models.yml

@@ -1,5 +1,6 @@
 version: 2
 
+models:
   - name: stg_orders
     columns:
       - name: order_id

jaffle_shop/models/staging/src_seed/_models.yml

@@ -16,7 +16,7 @@ renamed as (
         payment_method,
 
         -- `amount` is currently stored in cents, so we convert it to dollars
-        amount / 100 as amount
+        amount / 100 as amount_dollars
 
     from source
 

jaffle_shop/models/staging/src_seed/_sources.yml

@@ -51,6 +51,7 @@ final as (
         customers.customer_id,
         customers.first_name,
         customers.last_name,
+        
         customer_orders.first_order,
         customer_orders.most_recent_order,
         customer_orders.number_of_orders,