restored python scripts, database initializes with correct descriptions

db/Seed.js

@@ -97,15 +97,13 @@ async function main() {
         createProductsCarts, createProductsOrders
     ];
 
-    const categoryInsert = readCSV('./util/data/categories.csv', 'category');
-    const regionInsert = readCSV('./util/data/regions.csv', 'region');
-    const productInsert = readCSV('./util/data/products.csv', 'product');
+    // const categoryInsert = readCSV('./util/data/categories.csv', 'category');
+    // const regionInsert = readCSV('./util/data/regions.csv', 'region');
+    // const productInsert = readCSV('./util/data/products.csv', 'product');
 
-    const allInsertions = [
-        categoryInsert, regionInsert, productInsert
-    ]
-
-    let status;
+    // const allInsertions = [
+    //     categoryInsert, regionInsert, productInsert
+    // ]
 
     try {
         await client.query("DROP SCHEMA public CASCADE; CREATE SCHEMA public");
@@ -114,23 +112,18 @@ async function main() {
             await client.query(q);
         }
 
-        for (let section of allInsertions) {
-            for (let s of section) {
-                await client.query(s);
-            }
-        }
+        // for (let section of allInsertions) {
+        //     for (let s of section) {
+        //         await client.query(s);
+        //     }
+        // }
 
         await client.end();
-        status = "Database initialization successful.";
     } catch(e) {
-        status = e;
-    } finally {
-        if (status !== "Database initialization successful.") {
-            throw new Error(status);
-        }
+        throw new Error(e);
     }
 
-    console.log(status);
+    console.log("Database initialization successful");
 }
 
 main();

db/util/insert_contents.py

@@ -0,0 +1,29 @@
+import csv
+from psycopg2 import sql
+
+# function to read from a given csv file into postgres
+def insert_contents(conn, cur, file_path, table_name):
+    with open(file_path, 'r', encoding='utf-8-sig') as f:
+        reader = csv.reader(f)
+        first_row_accessed = False
+        header_names = ""
+        num_columns = 0
+
+        for row in reader:
+            # get row values from first row of reader
+            if not first_row_accessed:
+                header_names = [item for item in row]
+                num_columns = len(header_names)
+                first_row_accessed = True
+                continue
+
+            mapped_columns = [header_names[i] for i in range(num_columns)]
+            prepared_q = sql.SQL("INSERT INTO {TABLE} ({COLS}) VALUES ({VALS})").format(
+                TABLE=sql.Identifier(table_name),
+                COLS=sql.SQL(', ').join(map(sql.Identifier, mapped_columns)),
+                VALS=sql.SQL(', ').join(sql.Placeholder() * len(mapped_columns))
+            )
+            
+            cur.execute(prepared_q, [item for item in row])
+
+    conn.commit()

db/util/main.py

@@ -0,0 +1,22 @@
+import psycopg2
+from decouple import config
+from insert_contents import insert_contents
+
+# read data from environment if present
+env_path = "../../.env"
+DB_CONN = config('CONNECTION')
+USER = "mikayladobson"
+
+# connect to local database instance and open a cursor
+conn = psycopg2.connect(DB_CONN)
+cur = conn.cursor()
+
+print("Now attempting to populate database...")
+
+# read contents of each file into postgres
+insert_contents(conn, cur, "./data/categories.csv", 'category')
+insert_contents(conn, cur, "./data/regions.csv", 'region')
+insert_contents(conn, cur, "./data/products.csv", 'product')
+
+print("Insertions executed successfully.")
+print("Database preparations complete!")

db/util/readCSV.js

@@ -1,35 +0,0 @@
-const { readFileSync } = require('fs');
-const pgp = require('pg-promise')({ capSQL: true });
-
-module.exports = (path, tableName) => {
-    const arr = readFileSync(path)
-        .toString()
-        .split('\n')
-        .map(s => s.trim())
-        .map(s => s.split(',').map(s => s.trim()));
-
-    let data = [];
-    let queries = [];
-    let cols;
-
-    for (let row of arr) {
-        if (!cols) {
-            cols = row;
-        } else {
-            let formattedData = {};
-            for (let j = 0; j < row.length; j++) {
-                const key = cols[j];
-                const value = row[j];
-                formattedData[key] = value;
-            }
-
-            data.push(formattedData);
-        }
-    }
-
-    for (let each of data) {
-        queries.push(pgp.helpers.insert(each, cols, tableName));
-    }
-
-    return queries;
-}