ActiveRecord 3.2.14
I want to use ActiveRecord in a non-Rails Ruby project. I want to have available the rake tasks that are defined by ActiveRecord. How can I do that?
rake db:create # Create the database from DATABASE_URL or config/database.yml for the current Rails.env (use db:create:all to create all dbs in the config)
rake db:drop # Drops the database using DATABASE_URL or the current Rails.env (use db:drop:all to drop all databases)
rake db:fixtures:load # Load fixtures into the current environment's database
rake db:migrate # Migrate the database (options: VERSION=x, VERBOSE=false)
rake db:migrate:status # Display status of migrations
rake db:rollback # Rolls the schema back to the previous version (specify steps w/ STEP=n)
rake db:schema:dump # Create a db/schema.rb file that can be portably used against any DB supported by AR
rake db:schema:load # Load a schema.rb file into the database
rake db:seed # Load the seed data from db/seeds.rb
rake db:setup # Create the database, load the schema, and initialize with the seed data (use db:reset to also drop the db first)
rake db:structure:dump # Dump the database structure to db/structure.sql
rake db:version # Retrieves the current schema version number
The above list is the list of tasks that I want to be able to use on my non-Rails Ruby project that uses ActiveRecord. What do I have to write in my Rakefile?
Thanks in advance
The easiest thing to do is to load the tasks already defined in databases.rake. Here is a GIST of how it was done.
Inspired by this GIST by Drogus
Rakefile.rb
require 'yaml'
require 'logger'
require 'active_record'
include ActiveRecord::Tasks
class Seeder
def initialize(seed_file)
@seed_file = seed_file
end
def load_seed
raise "Seed file '#{@seed_file}' does not exist" unless File.file?(@seed_file)
load @seed_file
end
end
root = File.expand_path '..', __FILE__
DatabaseTasks.env = ENV['ENV'] || 'development'
DatabaseTasks.database_configuration = YAML.load(File.read(File.join(root, 'config/database.yml')))
DatabaseTasks.db_dir = File.join root, 'db'
DatabaseTasks.fixtures_path = File.join root, 'test/fixtures'
DatabaseTasks.migrations_paths = [File.join(root, 'db/migrate')]
DatabaseTasks.seed_loader = Seeder.new File.join root, 'db/seeds.rb'
DatabaseTasks.root = root
task :environment do
ActiveRecord::Base.configurations = DatabaseTasks.database_configuration
ActiveRecord::Base.establish_connection DatabaseTasks.env.to_sym
end
load 'active_record/railties/databases.rake'
您可以尝试独立迁移gem: https : //github.com/thuss/standalone-migrations
For Rails 3.x:
You need to manually create the tasks. As example here is how to add them (this example uses the environment variables like Rails):
namespace :db do
desc "Drop and create the current database"
task :recreate => :environment do
abcs = ActiveRecord::Base.configurations
ActiveRecord::Base.establish_connection(abcs[RAILS_ENV])
ActiveRecord::Base.connection.recreate_database(ActiveRecord::Base.connection.current_database)
end
end
and you'll have the task rake db:recreate
available
For Rails 4.x:
If you want to have the ActiveRecord rake tasks available in your ruby app, take a look at the documentation .
Example usage of DatabaseTasks outside Rails could look as such:
include ActiveRecord::Tasks
DatabaseTasks.database_configuration = YAML.load(File.read('my_database_config.yml'))
DatabaseTasks.db_dir = 'db'
# other settings...
DatabaseTasks.create_current('production')
Also you have here an example on how to use ActiveRecord in your ruby aplication.
Create your own! Reference the Rails one though:
https://github.com/rails/rails/blob/master/activerecord/lib/active_record/railties/databases.rake
-
Dir[File.join(PROJECT_ROOT, 'tasks', '**', '*.rake')].each do |file|
load file
end
I believe you can use the sinatra-activerecord
gem even if you're not using Sinatra. I just solved this problem by requiring that gem and then adding
require 'sinatra/activerecord/rake'
to my rakefile
.
Once I added that require
line the db
tasks showed up in my rake -T
!
If you are using Sinatra, you can use this gem:
https://github.com/janko-m/sinatra-activerecord
However, if you don't use it either, the source code inside provides a good example on how to implement AR rake tasks.
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