Add opinion Tables and request

src/main/resources/sql/functions/opinion/count_opinion.sql

@@ -0,0 +1,27 @@
+create or replace function count_opinion(_target_id uuid, out resource json)
+    language plpgsql as
+$$
+declare
+    agg jsonb;
+    empty jsonb = '[]'::jsonb;
+begin
+    select jsonb_object_agg(t.label, t.total)
+    into agg
+    from (
+        select
+            count(o.opinion) as total,
+            ol.name as label
+        from opinion o
+        join opinion_list ol on o.opinion = ol.id
+        where o.target_id = _target_id
+        group by ol.name
+        order by ol.name
+    ) t;
+
+    resource = empty || coalesce(agg, empty);
+end;
+$$;
+
+-- drop function if exists count_opinion(uuid);
+
+-- select * from count_opinion('ced1563f-ecf5-4f11-8518-8aeceff3c13a');

src/main/resources/sql/functions/opinion/opinion.sql

@@ -0,0 +1,17 @@
+create or replace function opinion(reference regclass, _target_id uuid, _created_by_id uuid, _opinion uuid, out resource json)
+    language plpgsql as
+$$
+begin
+    if reference = 'article'::regclass then
+        insert into opinion_on_article (created_by_id, target_id, opinion)
+        values (_created_by_id, _target_id, _opinion)
+        on conflict (created_by_id, target_id, opinion) do nothing;
+    else
+        raise exception '% no implemented for opinion', reference::text;
+    end if;
+
+    select count_opinion(_target_id) into resource;
+end;
+$$;
+
+-- drop function if exists vote(regclass,uuid,uuid,integer,boolean);