Rusql
Installation
Add this line to your application's Gemfile:
gem 'rusql'And then execute:
$ bundle
Or install it yourself as:
$ gem install rusql
Usage
Sample code:
class User < ActiveRecord::Base
extend Rusql
def self.fetch(id:)
users = table(:users)
groups = table(:groups)
group_users = table(:group_users)
query = select(
users[:*],
group_concat( groups[:name] ).as(:group_names)
).
from( users ).
left_outer_join( group_users, group_users[:user_id].equals( user[:id] ) ).
left_outer_join( groups, groups[:identifier].equals( group_users[:group_id] ) ).
where(
users[:id].equals(id).
and( groups[:created_at].greater_than( 7.days.ago ) )
).
limit(1)
User.find_by_sql( query.to_s ).first
end
endIf you monkey-patch ActiveRecord::Base as follows, you can actually write the above example in a better form.
Monkey patch
class ActiveRecord::Base
def self.as_rusql_table
t = Rusql::Table.new
t.name = self.table_name.to_sym
t
end
def self.[](ind)
Rusql::Column.new( self.as_rusql_table, ind )
end
end Better DSL
class User < ActiveRecord::Base
extend Rusql
def self.fetch(id:)
group_users = table(:group_users)
query = select(
User[:*],
group_concat( Group[:name] ).as(:group_names)
).
from( User ).
left_outer_join( group_users, group_users[:user_id].equals( User[:id] ) ).
left_outer_join( Group, Group[:identifier].equals( group_users[:group_id] ) ).
where(
User[:id].equals(id).
and( Group[:created_at].greater_than( 7.days.ago ) )
).
limit(1)
User.find_by_sql( query.to_s ).first
end
endP.S: The ActiveRecord extensions will be packaged into a gem soon.
Contributing
Bug reports and pull requests are welcome on GitHub at https://github.com/sparkymat/rusql. This project is intended to be a safe, welcoming space for collaboration, and contributors are expected to adhere to the Contributor Covenant code of conduct.
License
The gem is available as open source under the terms of the MIT License.
