feat(dbt): Add dbt models

models/customers.sql

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+with customers as (
+
+    select * from {{ ref('stg_customers') }}
+
+),
+
+orders as (
+
+    select * from {{ ref('stg_orders') }}
+
+),
+
+payments as (
+
+    select * from {{ ref('stg_payments') }}
+
+),
+
+customer_orders as (
+
+        select
+        customer_id,
+
+        min(order_date) as first_order,
+        max(order_date) as most_recent_order,
+        count(order_id) as number_of_orders
+    from orders
+
+    group by customer_id
+
+),
+
+customer_payments as (
+
+    select
+        orders.customer_id,
+        sum(amount) as total_amount
+
+    from payments
+
+    left join orders on
+         payments.order_id = orders.order_id
+
+    group by orders.customer_id
+
+),
+
+final as (
+
+    select
+        customers.customer_id,
+        customers.first_name,
+        customers.last_name,
+        customer_orders.first_order,
+        customer_orders.most_recent_order,
+        customer_orders.number_of_orders,
+        customer_payments.total_amount as customer_lifetime_value
+
+    from customers
+
+    left join customer_orders
+        on customers.customer_id = customer_orders.customer_id
+
+    left join customer_payments
+        on  customers.customer_id = customer_payments.customer_id
+
+)
+
+select * from final

models/docs.md

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+{% docs orders_status %}
+
+Orders can be one of the following statuses:
+
+| status         | description                                                                                                            |
+|----------------|------------------------------------------------------------------------------------------------------------------------|
+| placed         | The order has been placed but has not yet left the warehouse                                                           |
+| shipped        | The order has ben shipped to the customer and is currently in transit                                                  |
+| completed      | The order has been received by the customer                                                                            |
+| return_pending | The customer has indicated that they would like to return the order, but it has not yet been received at the warehouse |
+| returned       | The order has been returned by the customer and received at the warehouse                                              |
+
+
+{% enddocs %}

models/orders.sql

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+{% set payment_methods = ['credit_card', 'coupon', 'bank_transfer', 'gift_card'] %}
+
+with orders as (
+
+    select * from {{ ref('stg_orders') }}
+
+),
+
+payments as (
+
+    select * from {{ ref('stg_payments') }}
+
+),
+
+order_payments as (
+
+    select
+        order_id,
+
+        {% for payment_method in payment_methods -%}
+        sum(case when payment_method = '{{ payment_method }}' then amount else 0 end) as {{ payment_method }}_amount,
+        {% endfor -%}
+
+        sum(amount) as total_amount
+
+    from payments
+
+    group by order_id
+
+),
+
+final as (
+
+    select
+        orders.order_id,
+        orders.customer_id,
+        orders.order_date,
+        orders.status,
+
+        {% for payment_method in payment_methods -%}
+
+        order_payments.{{ payment_method }}_amount,
+
+        {% endfor -%}
+
+        order_payments.total_amount as amount
+
+    from orders
+
+
+    left join order_payments
+        on orders.order_id = order_payments.order_id
+
+)
+
+select * from final

models/overview.md

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+{% docs __overview__ %}
+
+## Data Documentation for Jaffle Shop
+
+`jaffle_shop` is a fictional ecommerce store.
+
+This [dbt](https://www.getdbt.com/) project is for testing out code.
+
+The source code can be found [here](https://github.com/clrcrl/jaffle_shop).
+
+{% enddocs %}

models/schema.yml

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+version: 2
+
+models:
+  - name: customers
+    description: This table has basic information about a customer, as well as some derived facts based on a customer's orders
+
+    columns:
+      - name: customer_id
+        description: This is a unique identifier for a customer
+        tests:
+          - unique
+          - not_null
+
+      - name: first_name
+        description: Customer's first name. PII.
+
+      - name: last_name
+        description: Customer's last name. PII.
+
+      - name: first_order
+        description: Date (UTC) of a customer's first order
+
+      - name: most_recent_order
+        description: Date (UTC) of a customer's most recent order
+
+      - name: number_of_orders
+        description: Count of the number of orders a customer has placed
+
+      - name: total_order_amount
+        description: Total value (AUD) of a customer's orders
+
+  - name: orders
+    description: This table has basic information about orders, as well as some derived facts based on payments
+
+    columns:
+      - name: order_id
+        tests:
+          - unique
+          - not_null
+        description: This is a unique identifier for an order
+
+      - name: customer_id
+        description: Foreign key to the customers table
+        tests:
+          - not_null
+          - relationships:
+              to: ref('customers')
+              field: customer_id
+
+      - name: order_date
+        description: Date (UTC) that the order was placed
+
+      - name: status
+        description: '{{ doc("orders_status") }}'
+        tests:
+          - accepted_values:
+              values: ['placed', 'shipped', 'completed', 'return_pending', 'returned']
+
+      - name: amount
+        description: Total amount (AUD) of the order
+        tests:
+          - not_null
+
+      - name: credit_card_amount
+        description: Amount of the order (AUD) paid for by credit card
+        tests:
+          - not_null
+
+      - name: coupon_amount
+        description: Amount of the order (AUD) paid for by coupon
+        tests:
+          - not_null
+
+      - name: bank_transfer_amount
+        description: Amount of the order (AUD) paid for by bank transfer
+        tests:
+          - not_null
+
+      - name: gift_card_amount
+        description: Amount of the order (AUD) paid for by gift card
+        tests:
+          - not_null

models/staging/schema.yml

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+version: 2
+
+models:
+  - name: stg_customers
+    columns:
+      - name: customer_id
+        tests:
+          - unique
+          - not_null
+
+  - name: stg_orders
+    columns:
+      - name: order_id
+        tests:
+          - unique
+          - not_null
+      - name: status
+        tests:
+          - accepted_values:
+              values: ['placed', 'shipped', 'completed', 'return_pending', 'returned']
+
+  - name: stg_payments
+    columns:
+      - name: payment_id
+        tests:
+          - unique
+          - not_null
+      - name: payment_method
+        tests:
+          - accepted_values:
+              values: ['credit_card', 'coupon', 'bank_transfer', 'gift_card']

models/staging/stg_customers.sql

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+with source as (
+
+    {#-
+    Normally we would select from the table here, but we are using seeds to load
+    our data in this project
+    #}
+    select * from {{ ref('raw_customers') }}
+
+),
+
+renamed as (
+
+    select
+        id as customer_id,
+        first_name,
+        last_name
+
+    from source
+
+)
+
+select * from renamed

models/staging/stg_orders.sql

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+with source as (
+
+    {#-
+    Normally we would select from the table here, but we are using seeds to load
+    our data in this project
+    #}
+    select * from {{ ref('raw_orders') }}
+
+),
+
+renamed as (
+
+    select
+        id as order_id,
+        user_id as customer_id,
+        order_date,
+        status
+
+    from source
+
+)
+
+select * from renamed

models/staging/stg_payments.sql

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+with source as (
+    
+    {#-
+    Normally we would select from the table here, but we are using seeds to load
+    our data in this project
+    #}
+    select * from {{ ref('raw_payments') }}
+
+),
+
+renamed as (
+
+    select
+        id as payment_id,
+        order_id,
+        payment_method,
+
+        -- `amount` is currently stored in cents, so we convert it to dollars
+        amount / 100 as amount
+
+    from source
+
+)
+
+select * from renamed