From 3da668394daa87d87b0b06c67f262854a314a6af Mon Sep 17 00:00:00 2001
From: Alex Kotov <kotovalexarian@gmail.com>
Date: Tue, 23 Jul 2019 01:48:36 +0500
Subject: [PATCH] Add PostgreSQL function "is_guest_token"

---
 db/migrate/20181129203927_initial_migration.rb | 11 ++++++++++-
 db/structure.sql                               | 15 ++++++++++++++-
 2 files changed, 24 insertions(+), 2 deletions(-)

diff --git a/db/migrate/20181129203927_initial_migration.rb b/db/migrate/20181129203927_initial_migration.rb
index 118b566..a702d8c 100644
--- a/db/migrate/20181129203927_initial_migration.rb
+++ b/db/migrate/20181129203927_initial_migration.rb
@@ -2,6 +2,15 @@
 
 class InitialMigration < ActiveRecord::Migration[6.0]
   def change
+    func :is_guest_token, <<~SQL
+      (str text) RETURNS boolean IMMUTABLE LANGUAGE plpgsql AS
+      $$
+      BEGIN
+        RETURN str ~ '^[0-9a-f]{32}$';
+      END;
+      $$;
+    SQL
+
     func :is_nickname, <<~SQL
       (str text) RETURNS boolean IMMUTABLE LANGUAGE plpgsql AS
       $$
@@ -244,7 +253,7 @@ class InitialMigration < ActiveRecord::Migration[6.0]
     SQL
 
     constraint :accounts, :guest_token, <<~SQL
-      guest_token ~ '^[0-9a-f]{32}$'
+      is_guest_token(guest_token)
     SQL
 
     constraint :accounts, :nickname, <<~SQL
diff --git a/db/structure.sql b/db/structure.sql
index 97d7c3c..61ae549 100644
--- a/db/structure.sql
+++ b/db/structure.sql
@@ -95,6 +95,19 @@ END;
 $_$;
 
 
+--
+-- Name: is_guest_token(text); Type: FUNCTION; Schema: public; Owner: -
+--
+
+CREATE FUNCTION public.is_guest_token(str text) RETURNS boolean
+    LANGUAGE plpgsql IMMUTABLE
+    AS $_$
+BEGIN
+  RETURN str ~ '^[0-9a-f]{32}$';
+END;
+$_$;
+
+
 --
 -- Name: is_nickname(text); Type: FUNCTION; Schema: public; Owner: -
 --
@@ -162,7 +175,7 @@ CREATE TABLE public.accounts (
     person_id bigint,
     contacts_list_id bigint NOT NULL,
     CONSTRAINT biography CHECK (((biography IS NULL) OR public.is_good_limited_text(biography, 3, 10000))),
-    CONSTRAINT guest_token CHECK (((guest_token)::text ~ '^[0-9a-f]{32}$'::text)),
+    CONSTRAINT guest_token CHECK (public.is_guest_token((guest_token)::text)),
     CONSTRAINT nickname CHECK (public.is_nickname((nickname)::text)),
     CONSTRAINT public_name CHECK (((public_name IS NULL) OR public.is_good_limited_text((public_name)::text, 3, 255)))
 );