Wrote first draft of sections database scheme
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-- This file should undo anything in `up.sql`
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drop trigger insert_enforce_post_titles on posts;
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drop trigger update_enforce_post_titles on posts;
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drop function enforce_post_titles;
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drop table posts cascade;
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drop table sections cascade;
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-- Your SQL goes here
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create table sections (
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id uuid DEFAULT gen_random_uuid() PRIMARY KEY,
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-- Title of the section
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title varchar(255) UNIQUE NOT NULL,
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-- Optional description of the section
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description text,
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-- Wether to show the section in the default list on the homepage
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is_default boolean NOT NULL DEFAULT false,
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-- Wether the posts should contain titles or not
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has_titles boolean NOT NULL DEFAULT true
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);
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create table posts (
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id uuid DEFAULT gen_random_uuid() PRIMARY KEY,
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section_id uuid NOT NULL REFERENCES sections(id) ON DELETE CASCADE,
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-- Title of the post
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-- Wether this is NULL or not is enforced using the enforce_post_titles trigger
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title varchar(255),
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-- Post date, defaults to today
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publish_date date NOT NULL DEFAULT now(),
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-- Content of the post
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content text NOT NULL
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);
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create function enforce_post_titles() returns trigger as $enforce_post_titles$
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begin
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-- Check for a wrongfully null title
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if new.title is null and exists (
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select 1 from sections where id = new.section_id and has_titles
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) then
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raise exception 'Expected a post title, but got null.';
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end if;
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if new.title is not null and exists (
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select 1 from sections where id = new.section_id and not has_titles
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) then
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raise exception 'Expected an empty post title, but got a value.';
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end if;
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return new;
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end;
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$enforce_post_titles$ language plpgsql;
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create trigger insert_enforce_post_titles
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before insert on posts
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for each row
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execute function enforce_post_titles();
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create trigger update_enforce_post_titles
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before update of title on posts
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for each row
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when (old.title is distinct from new.title)
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execute function enforce_post_titles();
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@ -1,3 +1,13 @@
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table! {
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posts (id) {
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id -> Uuid,
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section_id -> Uuid,
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title -> Nullable<Varchar>,
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publish_date -> Date,
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content -> Text,
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}
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}
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table! {
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table! {
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refresh_tokens (token) {
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refresh_tokens (token) {
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token -> Bytea,
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token -> Bytea,
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@ -7,6 +17,16 @@ table! {
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}
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}
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}
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}
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table! {
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sections (id) {
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id -> Uuid,
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title -> Varchar,
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description -> Nullable<Text>,
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is_default -> Bool,
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has_titles -> Bool,
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}
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}
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table! {
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table! {
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users (id) {
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users (id) {
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id -> Uuid,
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id -> Uuid,
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@ -17,6 +37,12 @@ table! {
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}
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}
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}
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}
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joinable!(posts -> sections (section_id));
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joinable!(refresh_tokens -> users (user_id));
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joinable!(refresh_tokens -> users (user_id));
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allow_tables_to_appear_in_same_query!(refresh_tokens, users,);
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allow_tables_to_appear_in_same_query!(
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posts,
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refresh_tokens,
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sections,
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users,
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);
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