add votes to article

src/main/kotlin/fr/dcproject/entity/Article.kt

@@ -19,6 +19,9 @@ class Article(
     EntityCreatedAt by EntityCreatedAtImp(),
     EntityCreatedBy<Citizen> by EntityCreatedByImp(createdBy),
     EntityDeletedAt by EntityDeletedAtImp() {
+
+    val votes = VoteAggregation(0,0,0)
+
     init {
         tags = tags.distinct()
     }

src/main/kotlin/fr/dcproject/entity/VoteAggregation.kt

@@ -0,0 +1,10 @@
+package fr.dcproject.entity
+
+import fr.postgresjson.entity.EntityUpdatedAt
+import fr.postgresjson.entity.EntityUpdatedAtImp
+
+open class VoteAggregation (
+    val up: Int,
+    val neutral: Int,
+    val down: Int
+): EntityUpdatedAt by EntityUpdatedAtImp()

src/main/resources/sql/functions/article/find_article_by_id.sql

@@ -7,7 +7,8 @@ begin
     from (
         select
             a.*,
-            find_citizen_by_id(a.created_by_id) as created_by
+            find_citizen_by_id(a.created_by_id) as created_by,
+            count_vote('article', a.id) as votes
         into resource
         from article as a
         where a.id = _id

src/main/resources/sql/functions/article/find_articles.sql

@@ -15,6 +15,7 @@ begin
         select
             a.*,
             find_citizen_by_id(a.created_by_id) as created_by,
+            count_vote('article', a.id) as votes,
             zdb.score(a.ctid) _score
         from article as a
         where (

src/main/resources/sql/functions/article/find_articles_versions_by_version_id.sql

@@ -14,7 +14,8 @@ begin
     from (
         select
             a.*,
-            find_citizen_by_id(a.created_by_id) as created_by
+            find_citizen_by_id(a.created_by_id) as created_by,
+            count_vote('article', a.id) as votes
         from article as a
         where a.version_id = _version_id
         order by a.version_number desc

src/main/resources/sql/functions/article/find_last_article_by_version_id.sql

@@ -7,7 +7,8 @@ begin
     from (
         select
             a.*,
-            find_citizen_by_id(a.created_by_id) as created_by
+            find_citizen_by_id(a.created_by_id) as created_by,
+            count_vote('article', a.id) as votes
         into resource
         from article as a
         where a.version_id = _version_id

src/main/resources/sql/functions/vote/count_vote.sql

@@ -0,0 +1,29 @@
+create or replace function count_vote(reference regclass, _target_id uuid, out resource json)
+    language plpgsql as
+$$
+declare
+    agg jsonb;
+    empty jsonb = '{"down":0,"neutral":0,"up":0}'::jsonb;
+begin
+    select jsonb_object_agg(t.label, t.total)
+    into agg
+    from (
+        select
+            count(v.note) as total,
+            (case v.note
+                when -1 then 'down'
+                when  0 then 'neutral'
+                when  1 then 'up'
+            end) as label
+        from vote v
+        where v.target_reference = reference
+          and v.target_id = _target_id
+        group by v.note
+        order by v.note
+    ) t;
+
+    resource = coalesce(agg, empty) || jsonb_build_object('updated_at', now());
+end;
+$$;
+
+-- drop function if exists count_vote(regclass,uuid);