Seed dump is a simple plugin that adds a rake task named db:seed:dump.

It allows you to create a db/seeds.rb from your existing data in the database. When there is no data in the database it will generate empty create statements.

It mainly exists for people who are too lazy writing create statements in db/seeds.rb themselves and need something (seed_dump) to dump data from the table(s) into seeds.rb

Example Usage

Dump all data directly to db/seeds.rb:

rake db:seed:dump

Dump only data from the users and products table and dump a maximum amount of 2 records:

$ rake db:seed:dump MODELS=User,Product LIMIT=2


$ cat db/seeds.rb 
# Autogenerated by the db:seed:dump task
# Do not hesitate to tweak this to your needs

products = Product.create([
  { :category_id => 1, :description => "Long Sleeve Shirt", :name => "Long Sleeve Shirt" },
  { :category_id => 3, :description => "Plain White Tee Shirt", :name => "Plain T-Shirt" }

users = User.create([
  { :id => 1, :password => "123456", :username => "test_1" },
  { :id => 2, :password => "234567", :username => "tes2" }

Append to db/seeds.rb instead of overwriting it:

rake db:seed:dump APPEND=true

Use another output file instead of db/seeds.rb

rake db:seed:dump FILE=db/categories.rb

By default the :id column will not be added to the generated Create statements If you do want the :id to be included use WITH_ID:

rake db:seed:dump WITH_ID=1

If you don't want seed_dump to dump any data allready available in the database use NO_DATA.

This will generate the dump with only 1 empty create statement. It's up to you to edit these and change the values into something meaningful:

rake db:seed:dump MODEL=User NO_DATA=1 APPEND=true

Here is a full example using all of the options above:

rake db:seed:dump MODELS=Category LIMIT=10 APPEND=true FILE=db/categories.rb WITH_ID=1 NO_DATA=1

All environment variables


Append the data to db/seeds.rb instead of overwriting it.


Use a different output file, default: db/seeds.rb


Dump no more then this amount of data, default: no limit


Split one create action per model to several create actions with MAX elements in each, default: no limit
It usefull for large data dumping to reduce memory usage


A model name or a comma seperated list of models, default: all models


Don't dump any data from the db, instead generate empty Create options


Inlcude the +:id+ in the create options


Include the :created_by and :updated_by timestamps (default)


Deactivate callbacks while importing.


Postgres schema support


Skip protection for columns that are protected by default.
Note : WITH_ID and TIMESTAMPS automatically override protection


Specify an alternative model dir

Copyright © 2010 Rob Halff, released under the MIT license