PGSEEDER

A seeder for adding and removing seeds from a Postgres database.

^🛠 INSTALLATION

• Clone pgseeder repo and cd into the created folder

  git clone https://github.com/gigamono/pgseeder

  cd pgseeder

• Build the binary.

  go build cmd/pgseeder.go

• Add the binary to system path and run pgseeder -h command

^📜 USAGE

CREATING SEED FILES

• Pgseeder expects .sql filenames to be ordered based on their dependency.

  The ordering format has to be a prefix and an integer.

  For example:

  01_users.sql
  

  20210702_users.sql
  

• You can use Pgseeder to create a timestamped .sql file.

  pgseeder --create "users"

  This generates a timestamped .sql file similar to this: 20210620150637_users.sql

^ℹ️ Ordering allows Pgseeder to avoid foreign key constraint errors when adding or removing all seeds.

ADDING SEEDS TO THE DATABASE

• To add seeds from a 20210620150637_users.sql file, you run following command:

  pgseeder -c "postgres://postgres@localhost:5432/resourcedb?sslmode=disable" --add users

  The -c is needed to connect to the database. It takes postgres connection string.

• You can also run all the .sql files in the current directory with the --add-all flag

  pgseeder -c "postgres://postgres@localhost:5432/resourcedb?sslmode=disable" --add-all

• You can specify a directory where the .sql files live with -d flag

  pgseeder -c "postgres://postgres@localhost:5432/resourcedb?sslmode=disable" --add-all -d "./seeds"

^ℹ️ To support removing seeds later, Pgseeder expects the .sql filename to correspond to seeded table's name.

^⚠ If multiple tables are seeded in a .sql file, Pgseeder will only recognise the one that matches the filename.

REMOVING SEEDS FROM THE DATABASE

• Here is how to remove seeds from users table.

  pgseeder -c "postgres://postgres@localhost:5432/resourcedb?sslmode=disable" --remove users

• To remove all seeds.

  pgseeder -c "postgres://postgres@localhost:5432/resourcedb?sslmode=disable" --remove-all

SEED KEYS

• By default Pgseeder stores the id (if there is one) of the seed which it uses later to remove it.

• Sometimes the primary key is not id. You can specify the primary key with -k flag.

  pgseeder -c "postgres://postgres@localhost:5432/resourcedb?sslmode=disable" --add users -k "user_id"

• And to uniquely identify seeds using composite keys, you separate them by colons, commas or spaces.

  pgseeder -c "postgres://postgres@localhost:5432/resourcedb?sslmode=disable" --add x_memberships -k "user_id, workspace_id"

^💀 CURRENT LIMITATIONS

• Only supports .sql files.

• Does not support seeding multiple tables in a single .sql file.