camper/deploy/payment.sql

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Add payment relation and use it to compute the booking’s cart I had to add the payment concept separate from the booking, unlike other eCommerce solutions that subsume the two into a single “order”, like WooCommerce, because bookings should be done in a separate Camper instance that will sync to the public instance, but the payment is done by the public instance. There will be a queue or something between the public and the private instance to pass along the booking information once the payment is complete, but the public instance still needs to keep track of payments without creating bookings. To compute the total for that payment i had to do the same as was doing until now for the cart. To prevent duplications, or having functions with complex return types, i now create a “draft” payment while the user is filling in the form, and compute the cart there; from Go i only have to retrieve the data from the relation, that simplifies the work, actually. Since the payment is computed way before customers enter their details, i can not have that data in the same payment relation, unless i allow NULL values. Allowing NULL values means that i can create a payment without customer, thus i moved all customer details to a separate relation. It still allows payment without customer, but at least there are no NULL values. Draft payments should be removed after a time, but i believe this needs to be done in a cronjob or similar, not in the Go application. To update the same payment while filling the same booking form, i now have a hidden field with the payment slug. A competent developer would have used a cookie or something like that; i am not competent.
2024-02-12 04:21:00 +00:00
-- Deploy camper:payment to pg
-- requires: roles
-- requires: schema_camper
-- requires: company
-- requires: campsite_type
-- requires: payment_status
begin;
set search_path to camper, public;
create table payment (
payment_id integer generated by default as identity primary key,
company_id integer not null references company,
slug uuid not null unique default gen_random_uuid(),
campsite_type_id integer not null references campsite_type,
arrival_date date not null,
departure_date date not null constraint departure_after_arrival check (departure_date > arrival_date),
subtotal_nights integer not null constraint subtotal_nights_not_negative check (subtotal_nights >= 0),
number_adults integer not null constraint number_adults_positive check (number_adults > 0),
subtotal_adults integer not null constraint subtotal_adults_not_negative check (subtotal_adults >= 0),
number_teenagers integer not null constraint number_teenagers_not_negative check (number_teenagers >= 0),
subtotal_teenagers integer not null constraint subtotal_teenagers_not_negative check (subtotal_teenagers >= 0),
number_children integer not null constraint number_children_not_negative check (number_children >= 0),
subtotal_children integer not null constraint subtotal_children_not_negative check (subtotal_children >= 0),
number_dogs integer not null constraint number_dogs_not_negative check (number_dogs >= 0),
subtotal_dogs integer not null constraint subtotal_dogs_not_negative check (subtotal_dogs >= 0),
subtotal_tourist_tax integer not null constraint subtotal_tourist_tax_not_negative check (subtotal_tourist_tax >= 0),
total integer not null constraint total_not_negative check (total >= 0),
zone_preferences text not null,
payment_status text not null default 'draft' references payment_status,
created_at timestamp with time zone not null default current_timestamp,
updated_at timestamp with time zone not null default current_timestamp
);
grant select, insert, update on table payment to guest;
grant select, insert, update on table payment to employee;
grant select, insert, update, delete on table payment to admin;
commit;