Initial commit

db/migrate/20200728143753_compact_liabilities.rb

@@ -0,0 +1,108 @@
+class CompactLiabilities < ActiveRecord::Migration[5.2]
+  def up_mysql
+    execute 'DROP procedure IF EXISTS `compact_orders`;'
+    execute <<-SQL
+
+    CREATE PROCEDURE `compact_orders`(
+        IN min_date DATETIME,
+        IN max_date DATETIME
+    )
+    BEGIN
+
+        -- Variables
+        DECLARE pointer INT;
+        DECLARE counter INT;
+
+        -- Temporary liabilities table
+        CREATE TABLE IF NOT EXISTS `liabilities_tmp` LIKE `liabilities`;
+
+        -- Copy liabilities to tmp
+        INSERT INTO `liabilities_tmp` SELECT * FROM `liabilities`
+        WHERE `reference_type` = 'Order' AND `created_at` BETWEEN min_date AND max_date;
+
+        -- Set counter and pointer vars
+        SELECT ROW_COUNT() INTO counter;
+        SELECT DATE_FORMAT(max_date, "%Y%m%d") INTO pointer;
+
+        -- Delete liabilities to compact
+        DELETE FROM `liabilities` WHERE `reference_type` = 'Order' AND `created_at` BETWEEN min_date AND max_date;
+
+        INSERT INTO `liabilities`
+        SELECT NULL, code, currency_id, member_id, 'CompactOrders',
+        DATE_FORMAT(max_date, "%Y%m%d"), SUM(debit), SUM(credit), DATE(`created_at`), NOW() FROM `liabilities_tmp`
+        WHERE `reference_type` = 'Order' AND `created_at` BETWEEN min_date AND max_date
+        GROUP BY code, currency_id, member_id, DATE(`created_at`);
+
+        DROP TABLE `liabilities_tmp`;
+
+        -- Return pointer and counter
+        SELECT pointer, counter;
+    END
+    SQL
+  end
+
+  def up_postgresql
+    execute <<-SQL
+    CREATE OR REPLACE FUNCTION compact_orders(
+        min_date DATE,
+        max_date DATE,
+        OUT pointer INTEGER,
+        OUT counter INTEGER
+    )
+    LANGUAGE plpgsql
+    AS $$
+    BEGIN
+        -- Temporary liabilities table
+        CREATE TABLE IF NOT EXISTS liabilities_tmp AS TABLE liabilities;
+
+        -- Copy liabilities to tmp
+        INSERT INTO liabilities_tmp SELECT * FROM liabilities
+        WHERE LOWER(reference_type) = LOWER('Order') AND created_at BETWEEN min_date AND max_date;
+
+        -- Set counter and pointer vars
+        get diagnostics counter = row_count;
+        SELECT to_char(max_date, 'YYYYMMDD')::integer from liabilities INTO pointer;
+
+        -- Delete liabilities to compact
+        DELETE FROM liabilities WHERE LOWER(reference_type) = LOWER('Order') AND created_at BETWEEN min_date AND max_date;
+
+        CREATE SEQUENCE liabilities_tmp_id START 1 INCREMENT 1 MINVALUE 1 OWNED BY liabilities_tmp.id;
+
+        INSERT INTO liabilities
+        SELECT nextval('liabilities_tmp_id') + (select max(id) + 1 from liabilities), code, currency_id, member_id, 'CompactOrders',
+        to_char(max_date, 'YYYYMMDD')::integer, SUM(debit)::decimal, SUM(credit)::decimal, DATE(created_at), NOW()::date FROM liabilities_tmp
+        WHERE LOWER(reference_type) = LOWER('Order') AND created_at BETWEEN min_date AND max_date
+        GROUP BY code, currency_id, member_id, DATE(created_at);
+
+        DROP SEQUENCE IF EXISTS liabilities_tmp_id;
+        DROP TABLE liabilities_tmp;
+    END
+    $$;
+    SQL
+  end
+
+  def up
+    case ActiveRecord::Base.connection.adapter_name
+    when 'Mysql2'
+      up_mysql
+
+    when 'PostgreSQL'
+      up_postgresql
+    else
+      raise "Unsupported adapter: #{ActiveRecord::Base.connection.adapter_name}"
+    end
+
+  end
+
+  def down
+    case ActiveRecord::Base.connection.adapter_name
+    when 'Mysql2'
+      execute 'DROP procedure IF EXISTS compact_orders;'
+
+    when 'PostgreSQL'
+      execute 'drop function IF EXISTS compact_orders(DATE,DATE);'
+    else
+      raise "Unsupported adapter: #{ActiveRecord::Base.connection.adapter_name}"
+    end
+  end
+end