mAi
b8d3418876
- 0001_init.sql: projax.items + projax.item_links tables with indices, partial-unique root slug, updated_at trigger, schema grants to the application role. - 0002_path_trigger.sql: BEFORE-write trigger maintains items.path via recursive parent walk; rejects cycles and structural-rule violations (areas at root, projects not at root). AFTER trigger rewrites descendant paths on slug rename or re-parent. - 0003_seed_areas.sql: dev, sports, home, work, health, finances, social. - db/migrate.go: embed.FS-backed sequential runner. - db/migrate_test.go: integration suite covering idempotency, nest, rename propagation, re-parent propagation, cycle rejection, and structural rules. Skips when no DB env var is set. Also ignores .m/events.log and .m/locks (per-worker scratch).
109 lines
3.3 KiB
PL/PgSQL
109 lines
3.3 KiB
PL/PgSQL
-- 0002_path_trigger.sql
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-- Maintain projax.items.path as dot-joined slug walk from root.
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-- Enforce: areas at root only, projects not at root, no cycles.
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-- See docs/design.md §3.1
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create or replace function projax.compute_item_path(p_parent_id uuid, p_slug text, p_self_id uuid)
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returns text
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language plpgsql
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stable
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as $$
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declare
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parts text[] := array[p_slug];
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cur_id uuid := p_parent_id;
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cur_slug text;
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cur_parent uuid;
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hops int := 0;
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begin
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while cur_id is not null loop
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hops := hops + 1;
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if hops > 64 then
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raise exception 'projax.items: path depth exceeds 64 (cycle or pathological tree?)';
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end if;
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if p_self_id is not null and cur_id = p_self_id then
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raise exception 'projax.items: cycle detected (item % is ancestor of itself)', p_self_id
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using errcode = 'check_violation';
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end if;
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select slug, parent_id into cur_slug, cur_parent
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from projax.items
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where id = cur_id;
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if cur_slug is null then
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raise exception 'projax.items: parent % not found', cur_id;
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end if;
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parts := array_prepend(cur_slug, parts);
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cur_id := cur_parent;
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end loop;
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return array_to_string(parts, '.');
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end;
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$$;
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create or replace function projax.items_before_write()
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returns trigger
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language plpgsql
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as $$
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begin
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-- Structural rules
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if 'area' = any(new.kind) and new.parent_id is not null then
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raise exception 'projax.items: area must have parent_id = NULL (got %)', new.parent_id
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using errcode = 'check_violation';
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end if;
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if 'project' = any(new.kind) and new.parent_id is null then
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raise exception 'projax.items: project must have a non-null parent_id'
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using errcode = 'check_violation';
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end if;
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-- Cycle check on UPDATE: a node cannot be its own ancestor
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if tg_op = 'UPDATE' and new.parent_id is not null and new.parent_id = new.id then
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raise exception 'projax.items: parent_id cannot equal id'
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using errcode = 'check_violation';
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end if;
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-- Compute path
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new.path := projax.compute_item_path(new.parent_id, new.slug,
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case when tg_op = 'UPDATE' then new.id else null end);
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return new;
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end;
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$$;
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drop trigger if exists items_before_write on projax.items;
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create trigger items_before_write
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before insert or update of slug, parent_id, kind on projax.items
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for each row execute function projax.items_before_write();
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-- After update of slug or parent_id: recompute paths of all descendants.
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create or replace function projax.items_after_reparent()
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returns trigger
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language plpgsql
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as $$
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begin
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if (tg_op = 'UPDATE') and (old.slug is distinct from new.slug or old.parent_id is distinct from new.parent_id) then
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-- Use recursive CTE to refresh descendant paths
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with recursive descendants as (
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select id, parent_id, slug
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from projax.items
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where parent_id = new.id
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union all
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select i.id, i.parent_id, i.slug
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from projax.items i
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join descendants d on i.parent_id = d.id
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)
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update projax.items i
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set path = projax.compute_item_path(i.parent_id, i.slug, i.id)
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from descendants d
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where i.id = d.id;
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end if;
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return null;
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end;
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$$;
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drop trigger if exists items_after_reparent on projax.items;
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create trigger items_after_reparent
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after update of slug, parent_id on projax.items
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for each row execute function projax.items_after_reparent();
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