Get Product API working fine

migrations/00000000000000_diesel_initial_setup/down.sql

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+-- This file was automatically created by Diesel to setup helper functions
+-- and other internal bookkeeping. This file is safe to edit, any future
+-- changes will be added to existing projects as new migrations.
+
+DROP FUNCTION IF EXISTS diesel_manage_updated_at(_tbl regclass);
+DROP FUNCTION IF EXISTS diesel_set_updated_at();

migrations/00000000000000_diesel_initial_setup/up.sql

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+-- This file was automatically created by Diesel to setup helper functions
+-- and other internal bookkeeping. This file is safe to edit, any future
+-- changes will be added to existing projects as new migrations.
+
+
+
+
+-- Sets up a trigger for the given table to automatically set a column called
+-- `updated_at` whenever the row is modified (unless `updated_at` was included
+-- in the modified columns)
+--
+-- # Example
+--
+-- ```sql
+-- CREATE TABLE users (id SERIAL PRIMARY KEY, updated_at TIMESTAMP NOT NULL DEFAULT NOW());
+--
+-- SELECT diesel_manage_updated_at('users');
+-- ```
+CREATE OR REPLACE FUNCTION diesel_manage_updated_at(_tbl regclass) RETURNS VOID AS $$
+BEGIN
+    EXECUTE format('CREATE TRIGGER set_updated_at BEFORE UPDATE ON %s
+                    FOR EACH ROW EXECUTE PROCEDURE diesel_set_updated_at()', _tbl);
+END;
+$$ LANGUAGE plpgsql;
+
+CREATE OR REPLACE FUNCTION diesel_set_updated_at() RETURNS trigger AS $$
+BEGIN
+    IF (
+        NEW IS DISTINCT FROM OLD AND
+        NEW.updated_at IS NOT DISTINCT FROM OLD.updated_at
+    ) THEN
+        NEW.updated_at := current_timestamp;
+    END IF;
+    RETURN NEW;
+END;
+$$ LANGUAGE plpgsql;

migrations/2020-11-29-201712_create_products/down.sql

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+-- This file should undo anything in `up.sql`
+drop table products;

migrations/2020-11-29-201712_create_products/up.sql

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+create table if not exists products
+(
+    productid   integer   not null
+        constraint pk_products
+            primary key,
+    productname text      not null,
+    created_at  timestamp not null default current_timestamp
+);

migrations/2020-11-29-201716_create_orders/down.sql

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+-- This file should undo anything in `up.sql`
+drop table orders;

migrations/2020-11-29-201716_create_orders/up.sql

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+create table if not exists orders
+(
+    orderid        integer   not null
+        constraint pk_orders
+            primary key,
+    customer_email text      not null,
+    created_at     timestamp not null default current_timestamp
+);

migrations/2020-11-29-201720_create_order_details/down.sql

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+-- This file should undo anything in `up.sql`
+drop table order_details;

migrations/2020-11-29-201720_create_order_details/up.sql

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+create table if not exists order_details
+(
+    orderid   integer  not null
+        constraint fk_order_details_orders
+            references orders (orderid),
+    productid integer not null
+        constraint fk_order_details_products
+            references products(productid),
+    constraint pk_order_details
+        primary key (orderid, productid),
+    quantity integer not null
+);