resources/sql/migrations/0000-init.down.sql

@@ -1,6 +1,12 @@
-drop trigger generate_version_number_trigger on article;
-drop table article;
-drop function generate_version_number(regclass, uuid);
-drop function set_version_number();
-drop trigger generate_version_number_trigger on constitution;
-drop table constitution;
+-- Article & Contitution
+drop trigger if exists set_constitution_link_trigger on article_on_title;
+drop table if exists article_in_title;
+drop table if exists title;
+drop function if exists set_constitution_link();
+
+drop trigger if exists generate_version_number_trigger on article;
+drop table if exists article;
+drop function if exists generate_version_number(regclass, uuid);
+drop trigger if exists generate_version_number_trigger on constitution;
+drop table if exists constitution;
+drop function if exists set_version_number();

resources/sql/migrations/0000-init.up.sql

@@ -16,7 +16,7 @@ $$;
 
 create table article
 (
-    id             uuid          default uuid_generate_v4() not null,
+    id             uuid          default uuid_generate_v4() not null primary key,
     created_at     timestamptz   default now()              not null,
     version_id     uuid          default uuid_generate_v4() not null,
     version_number int                                      not null,
@@ -34,7 +34,7 @@ EXECUTE PROCEDURE set_version_number();
 
 create table constitution
 (
-    id             uuid          default uuid_generate_v4() not null,
+    id             uuid        default uuid_generate_v4() not null primary key,
     created_at     timestamptz default now()              not null,
     version_id     uuid        default uuid_generate_v4() not null,
     version_number int                                    not null,
@@ -46,3 +46,39 @@ CREATE TRIGGER generate_version_number_trigger
     BEFORE INSERT
     ON constitution
 EXECUTE PROCEDURE set_version_number();
+
+create table title
+(
+    id              uuid        default uuid_generate_v4() not null primary key,
+    created_at      timestamptz default now()              not null,
+    name            text                                   not null,
+    rank            int                                    not null,
+    constitution_id uuid                                   not null references constitution (id)
+);
+
+create table article_in_title
+(
+    id              uuid        default uuid_generate_v4() not null primary key,
+    created_at      timestamptz default now()              not null,
+    rank            int                                    not null,
+    title_id        uuid                                   not null references title (id),
+    article_id      uuid                                   not null references article (id),
+    constitution_id uuid                                   not null references constitution (id)
+);
+
+create or replace function set_constitution_link() returns trigger
+    language plpgsql as
+$$
+begin
+    new.constitution_id = (
+        select t.constitution_id
+        from title as t
+        where t.id = new.title_id
+    );
+end;
+$$;
+
+CREATE TRIGGER set_constitution_link_trigger
+    BEFORE INSERT
+    ON article_in_title
+EXECUTE PROCEDURE set_constitution_link();