90 lines
3.0 KiB
PL/PgSQL
90 lines
3.0 KiB
PL/PgSQL
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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-- Name to use when routing (this just makes for prettier URLs)
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shortname varchar(32) 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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-- Wether posts in this section should be shown publicly
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is_private boolean NOT NULL DEFAULT false
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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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-- Posts shouldn't get deleted when we delete a section, as they're the
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-- most valuable part of a blog
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section_id uuid NOT NULL REFERENCES sections(id) ON DELETE SET NULL,
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-- Wether a post should be private
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is_private boolean NOT NULL DEFAULT false,
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-- Wether the post is archived
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is_archived boolean NOT NULL DEFAULT false
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);
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create table versions (
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id uuid DEFAULT gen_random_uuid() PRIMARY KEY,
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-- A version should be deleted when its referenced post is deleted
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post_id uuid NOT NULL REFERENCES posts(id) ON DELETE CASCADE,
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-- Title of the post. Wether this is NULL or not is enforced using the
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-- enforce_post_titles trigger.
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title varchar(255),
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-- Publish date
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publish_date date,
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-- Content of the post, in Markdown
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content text NOT NULL DEFAULT '',
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-- Wether the version is still a draft
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is_draft boolean NOT NULL default true,
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-- This check allows draft posts to be created without having to enter a
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-- publish date, but forces them to have one if they're not a draft.
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CHECK (is_draft OR publish_date IS NOT NULL)
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);
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create function enforce_version_titles() returns trigger as $$
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begin
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-- Draft versions shouldn't be evaluated.
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if new.is_draft then
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return new;
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end if;
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-- Check for a wrongfully null title
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if new.title is null and exists (
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select 1 from posts
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inner join sections on posts.section_id = sections.id
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where posts.id = new.post_id and sections.has_titles
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) then
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raise exception 'Expected a post title, but got null.';
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end if;
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if new.title is not null and exists (
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select 1 from posts
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inner join sections on posts.section_id = sections.id
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where posts.id = new.post_id and not sections.has_titles
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) then
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raise exception 'Expected an empty post title, but got a value.';
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end if;
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return new;
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end;
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$$ language plpgsql;
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create trigger insert_enforce_version_titles
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before insert on versions
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for each row
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execute function enforce_version_titles();
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create trigger update_enforce_version_titles
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before update of title on versions
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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_version_titles();
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