feat: implemented incremental model for scored products

dags/sustainability_score/__init__.py

@@ -27,6 +27,25 @@ CONFIG = {
     "scored_table": "sustainability_score.scored_products",
 }
 
+
+def dbt(cmd: str, attach_dag: DAG) -> BashOperator:
+    """Setup and return an operator to run dbt commands"""
+    return BashOperator(
+        dag=attach_dag,
+        task_id=f"dbt_{ cmd }",
+        bash_command=f"dbt { cmd }",
+        cwd="/dbt",
+        env={
+            "POSTGRES_HOST": "{{ conn.get('pg_db').host }}",
+            "POSTGRES_USER": "{{ conn.get('pg_db').login }}",
+            "POSTGRES_PASSWORD": "{{ conn.get('pg_db').password }}",
+            "POSTGRES_PORT": "{{ conn.get('pg_db').port }}",
+            "POSTGRES_DATABASE": "{{ conn.get('pg_db').schema }}",
+        },
+        append_env=True,
+    )
+
+
 with DAG(
     "sustainability_score",
     schedule_interval="0 * * * 1-5",
@@ -38,12 +57,7 @@ with DAG(
 ) as dag:
     create_products_table = PostgresOperator(
         task_id="create_products_table",
-        sql="products_schema.sql",
-        postgres_conn_id="pg_db",
-    )
-    create_scores_table = PostgresOperator(
-        task_id="create_scored_products_table",
-        sql="scored_products_schema.sql",
+        sql="sql/products_schema.sql",
         postgres_conn_id="pg_db",
     )
 
@@ -61,25 +75,7 @@ with DAG(
         },
     )
 
-    calculate_score = PostgresOperator(
-        task_id="calculate_score",
-        sql="sql/calculate_score.sql",
-        postgres_conn_id="pg_db",
-    )
+    dbt_run = dbt("run", dag)
+    dbt_test = dbt("test", dag)
 
-    create_products_table >> etl_pipeline
-    [etl_pipeline, create_scores_table] >> calculate_score
-
-    dbt_run = BashOperator(
-        task_id="run_dbt",
-        bash_command="dbt run",
-        cwd="/dbt",
-        env={
-            "POSTGRES_HOST": "{{ conn.get('pg_db').host }}",
-            "POSTGRES_USER": "{{ conn.get('pg_db').login }}",
-            "POSTGRES_PASSWORD": "{{ conn.get('pg_db').password }}",
-            "POSTGRES_PORT": "{{ conn.get('pg_db').port }}",
-            "POSTGRES_DATABASE": "{{ conn.get('pg_db').schema }}",
-        },
-        append_env=True,
-    )
+    create_products_table >> etl_pipeline >> dbt_run >> dbt_test

dags/sustainability_score/sql/products_schema.sql

@@ -1,9 +1,13 @@
 CREATE TABLE IF NOT EXISTS {{ params.products_table }} (
     tcin             VARCHAR PRIMARY KEY,
     gtin13           VARCHAR   NOT NULL,
+    ingestion_time   TIMESTAMP NOT NULL,
     primary_category VARCHAR   NOT NULL,
     materials        VARCHAR[],
     packaging        INT       NOT NULL,
     origin           VARCHAR   NOT NULL,
-    weight           NUMERIC
+    weight           NUMERIC,
+    height           NUMERIC,
+    width            NUMERIC,
+    depth            NUMERIC
 );

dbt/models/category_material_scores.sql

@@ -0,0 +1,16 @@
+{{ config(materialized='view') }}
+
+WITH unnested_materials AS (
+    SELECT
+        primary_category,
+        unnest(materials) unnested_material
+    FROM {{ source('products', 'products') }}
+)
+
+SELECT
+    primary_category,
+    AVG(lookup.score) AS score
+FROM unnested_materials
+JOIN {{ ref('material_lookup') }} AS lookup
+ON unnested_materials.unnested_material = lookup.material
+GROUP BY primary_category

dbt/models/scored_products.sql

@@ -1,36 +1,29 @@
-{{ config(materialized='table') }}
+{{ 
+    config(
+        materialized='incremental',
+        unique_key='tcin'
+    )
+}}
 
-WITH unnested_materials AS (
-    SELECT
-        primary_category,
-        unnest(materials) unnested_material
-    FROM {{ source('products', 'products') }}
-),
-
-material_scores AS (
-    SELECT
-        primary_category,
-        AVG(lookup.score) AS score
-    FROM unnested_materials
-    JOIN {{ ref('material_lookup') }} AS lookup
-    ON unnested_materials.unnested_material = lookup.material
-    GROUP BY primary_category
-),
-
-scores AS (
+WITH scores AS (
     SELECT
         tcin,
+        ingestion_time,
         material_scores.score AS material_score,
         weight * 0.75 AS weight_score,
         packaging * 0.6 AS packaging_score,
         lookup.score AS origin_score
     FROM {{ source('products', 'products') }} AS products
-    LEFT JOIN material_scores USING (primary_category)
+    LEFT JOIN {{ ref('category_material_scores') }} AS material_scores USING (primary_category)
     LEFT JOIN {{ ref('origin_lookup') }} AS lookup USING (origin)
+    {% if is_incremental() %}
+        WHERE ingestion_time > (SELECT MAX(ingestion_time) FROM {{ this }})
+    {% endif %}
 )
 
 SELECT
   tcin,
+  ingestion_time,
   material_score,
   weight_score,
   packaging_score,

dbt/models/sustainability_score.yml

@@ -19,6 +19,9 @@ models:
       - name: score
         type: float
 
+  - name: category_material_scores
+    description: "view holding the material score of each primary_category"
+
   - name: origin_lookup
     description: "lookup table to match product origin and their score"
     columns:
@@ -38,6 +41,12 @@ models:
           - unique
           - not_null
 
+      - name: ingestion_time
+        type: timestamp
+        description: "timestamp of when the row was inserted or updated by the ETL process"
+        tests:
+          - not_null
+
       - name: material_score
         type: float
         description: "score calculated from the score"