README

How to Run

1. go to root directory of project
2. run docker-compose up --build to build whole system
3. go to another window and connect to db using docker exec -it <container_id_of_db> bash ( docker container ls to see id)

• create both databases specified in config/shards.yml
• run the migration using rake task from web container as specified in step 4
• create table ar_internal_metadata for transport_dev_new db. refer to same table from transport_dev db

CREATE TABLE ar_internal_metadata (
      key character varying NOT NULL,
      value character varying,
      created_at timestamp without time zone NOT NULL,
      updated_at timestamp without time zone NOT NULL
  );
  
  ALTER TABLE ONLY ar_internal_metadata
      ADD CONSTRAINT ar_internal_metadata_pkey PRIMARY KEY (key);
  
  INSERT INTO ar_internal_metadata(key, value, created_at, updated_at) values('environment', 'development', NOW(), NOW());

• clean all rows from schema_migration_table from transport_dev_new db
• Re run he migration using rake task specified in step 4

4. go to another window and connect to rails app using docker exec -it <container_id> bash ( docker container ls to see id)

• run rake db:migrate
• run rake octopus:copy_schema_versions

Problems yet to tackle

1. Creating databases automatically with rake db:setup
2. Running Schema migration for only one shard initially and then for another shard