SQL function duplication and unnecessary calls

graphile.config.mjs

@@ -11,6 +11,7 @@ import PersistedPlugin from "@grafserv/persisted";
 import { PgOmitArchivedPlugin } from "@graphile-contrib/pg-omit-archived";
 import { dirname } from "path";
 import { fileURLToPath } from "url";
+import { myExtensions } from "./plugins.mjs";
 
 const __filename = fileURLToPath(import.meta.url);
 const __dirname = dirname(__filename);
@@ -25,6 +26,7 @@ const preset = {
     AmberPreset.default ?? AmberPreset,
     makeV4Preset({
       /* Enter your V4 options here */
+      dynamicJson: true,
       graphiql: true,
       graphiqlRoute: "/",
     }),
@@ -33,7 +35,7 @@ const preset = {
     PgAggregatesPreset,
     // PgSimplifyInflectionPreset
   ],
-  plugins: [PersistedPlugin.default, PgOmitArchivedPlugin, TagsFilePlugin],
+  plugins: [PersistedPlugin.default, PgOmitArchivedPlugin, TagsFilePlugin, myExtensions],
   pgServices: [
     makePgService({
       // Database connection string:

plugins.mjs

@@ -0,0 +1,104 @@
+import { TYPES } from 'postgraphile/@dataplan/pg';
+import { gql, makeExtendSchemaPlugin } from "postgraphile/utils";
+
+export const myExtensions = makeExtendSchemaPlugin((build) => {
+  const {
+    input: {
+      pgRegistry: {
+        pgResources: { shop, owner, v_metadata, image, get_shop_info },
+      },
+    },
+    grafast: { each, constant, lambda, object },
+  } = build;
+
+  return {
+    typeDefs: gql`
+      extend type Query {
+        shopsByIds(ids: [String!]!): [Shop]!
+      }
+
+      extend type Shop {
+        info: ShopInfo
+        owner: Owner
+        options: MetaOptions
+        image: Image
+      }
+
+      type ShopInfo {
+        petInfo: JSON
+        customersInfo: JSON
+      }
+
+      type MetaOptions {
+        pickup: Boolean!
+        worldwide: Boolean!
+        random: String
+      }
+
+      extend type ShopFrontImage {
+        layouts: Image
+      }
+    `,
+    plans: {
+      Query: {
+        shopsByIds(_, { $ids }) {
+          return each($ids, ($id) => shop.find({ id: $id, visible: constant(true) }).single())
+        }
+      },
+      Shop: {
+        info($parent) {
+          return $parent;
+        },
+        image($parent) {
+          const $layouts = image.find({
+            parent_id: $parent.get('id'),
+            parent_type: 'shop',
+            type: 'front',
+          });
+          return $layouts.single();
+        },
+        owner($parent) {
+          return owner
+            .find({
+              id: $parent.get('owner_id'),
+            })
+            .single();
+        },
+        options($parent) {
+          const special = v_metadata.find({
+            id: $parent.get('dis_special'),
+          });
+          const specialTitle = special.single().get('title');
+          return object({
+            pickup: lambda($parent.get('di_pickup'), (v) => v !== null),
+            worldwide: lambda($parent.get('di_worldwide'), (v) => v !== null),
+            random: specialTitle,
+          });
+        }
+      },
+      ShopInfo: {
+        petInfo($parent) {
+          const $fnData = get_shop_info.execute([{ step: $parent.get('id'), pgCodec: TYPES.int, name: 'id_param' }], 'normal')
+
+          return $fnData;
+        },
+        customersInfo($parent) {
+          const $fnData = get_shop_info.execute([{ step: $parent.get('id'), pgCodec: TYPES.int, name: 'id_param' }], 'normal')
+
+          return $fnData;
+        }
+      },
+      ShopFrontImage: {
+        layouts($parent) {
+          const $layouts = image.find({
+            parent_id: $parent.get('id'),
+            parent_type: 'shop',
+            type: 'front',
+          });
+          return $layouts.single();
+        }
+      },
+    },
+  };
+});
+

schema.sql

@@ -0,0 +1,161 @@
+drop table if exists public.owner;
+create table public.owner(
+	id text,
+	name text
+);
+insert into public.owner (id, name)
+values ('1', 'Andrey'), ('2', 'Kaarel');
+
+drop table if exists public.shop;
+create table public.shop(
+	id text,
+	name text,
+	visible boolean,
+	owner_id text,
+	di_pickup text,
+	di_worldwide text,
+	dis_special text
+);
+INSERT INTO public.shop (
+	id,
+	name,
+	visible,
+	owner_id,
+	di_pickup,
+	di_worldwide,
+	dis_special
+) VALUES (
+	'1',
+	'One',
+	true,
+	'1',
+	'1',
+	'2',
+	'3'
+),
+(
+	'2',
+	'Two',
+	true,
+	'2',
+	'1',
+	'2',
+	'3'
+),
+(
+	'3',
+	'Three',
+	false,
+	'1',
+	'1',
+	'2',
+	'3'
+),
+(
+	'4',
+	'Four',
+	true,
+	'2',
+	'1',
+	'2',
+	'3'
+);
+
+drop table if exists public.pet;
+create table public.pet(
+	id text,
+	name text,
+	type text,
+	shop_id text
+);
+insert into public.pet (id, name, type, shop_id)
+values ('1', 'Nikki', 'cat', '1'),
+	('2', 'Brown', 'dog', '2');
+
+drop view if exists public.v_metadata;
+
+drop table if exists public.metadata;
+create table public.metadata(
+	id text,
+	type text,
+	title text
+);
+INSERT INTO public.metadata (id, type, title)
+VALUES ('1', 'pickup', '10% off on all pickups'),
+	('2', 'donate', 'We accept your valuable donations via cards'),
+	('3', 'worldwide', 'We delivery anywhere with care');
+
+drop table if exists public.metadata_enriched;
+create table public.metadata_enriched(
+	id text,
+	type text,
+	title text,
+	enriched_text text
+);
+INSERT INTO public.metadata_enriched (id, type, title, enriched_text)
+VALUES ('1', 'pickup', '10% off on all pickups', 'pickup enriched'),
+	('2', 'donate', 'We accept your valuable donations via cards', 'donate enriched'),
+	('3', 'worldwide', 'We delivery anywhere with care', 'worldwide enriched');
+
+drop table if exists public.app_config CASCADE;
+create table public.app_config
+(
+  id TEXT PRIMARY KEY,
+  feed_date TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+  name TEXT NOT NULL default 'Fake name',
+  data jsonb
+);
+insert into public.app_config (id, data)
+values ('seo', '{ "some": "data", "other": "more data"}');
+
+drop view if exists public.v_metadata;
+CREATE VIEW public.v_metadata AS
+SELECT
+	m.id,
+	m.type,
+	m.title,
+	me.enriched_text
+FROM public.metadata m
+       LEFT JOIN public.metadata_enriched me ON m.id = me.id
+	   LEFT JOIN LATERAL (
+			SELECT data as config
+			FROM public.app_config
+			WHERE id = 'seo'
+			LIMIT 1
+		) sc ON TRUE;
+
+drop table if exists public.image;
+create table public.image(
+	parent_type text,
+	parent_id text,
+	type text,
+	original text,
+	dim64x64 text,
+	dim128x128 text,
+
+	primary key (parent_type, parent_id, type)
+);
+insert into public.image (parent_type, parent_id, type, original, dim64x64, dim128x128)
+values ('shop', '1', 'front', 'http://fake-original', 'http://fake-64', null),
+('shop', '2', 'front', 'http://fake-original', 'http://fake-64', 'http://fake-128');
+
+CREATE OR REPLACE FUNCTION public.get_shop_info(id_param text)
+RETURNS json AS $$
+DECLARE
+    result_row json;
+BEGIN
+    SELECT json_build_object(
+      'assetId', s.id,
+	  'petId', p.id,
+	  'petType', p.type,
+	  'text', s.name || ' - ' || p.name
+    )
+    INTO result_row
+    FROM public.shop s
+    LEFT JOIN public.pet p
+      ON s.id = p.shop_id
+    WHERE s.id = id_param;
+
+    RETURN result_row;
+END;
+$$ LANGUAGE plpgsql STABLE;