ruby on rails - `require': LoadError: cannot load such file -- sequel/adapters/sqlite3 (Sequel::AdapterNotFound) -

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i using sequel in rails application instead of active record.

how configure , connect database? using 

db = sequel.connect(env['database_url'])

but getting errors:

/home/aaditya/downloads/ruby-bench-suite/rails/vendor/bundle/ruby/2.3.0/gems/sequel-3.40.0/lib/sequel/core.rb:379:in `require': loaderror: cannot load such file -- sequel/adapters/sqlite3 (sequel::adapternotfound)     /home/aaditya/downloads/ruby-bench-suite/rails/vendor/bundle/ruby/2.3.0/gems/sequel-3.40.0/lib/sequel/core.rb:379:in `block in tsk_require'     /home/aaditya/downloads/ruby-bench-suite/rails/vendor/bundle/ruby/2.3.0/gems/sequel-3.40.0/lib/sequel/core.rb:100:in `block in check_requiring_thread'     /home/aaditya/downloads/ruby-bench-suite/rails/vendor/bundle/ruby/2.3.0/gems/sequel-3.40.0/lib/sequel/core.rb:97:in `synchronize'     /home/aaditya/downloads/ruby-bench-suite/rails/vendor/bundle/ruby/2.3.0/gems/sequel-3.40.0/lib/sequel/core.rb:97:in `check_requiring_thread'     /home/aaditya/downloads/ruby-bench-suite/rails/vendor/bundle/ruby/2.3.0/gems/sequel-3.40.0/lib/sequel/core.rb:379:in `tsk_require'     /home/aaditya/downloads/ruby-bench-suite/rails/vendor/bundle/ruby/2.3.0/gems/sequel-3.40.0/lib/sequel/database/connecting.rb:25:in `adapter_class'     /home/aaditya/downloads/ruby-bench-suite/rails/vendor/bundle/ruby/2.3.0/gems/sequel-3.40.0/lib/sequel/database/connecting.rb:55:in `connect'     /home/aaditya/downloads/ruby-bench-suite/rails/vendor/bundle/ruby/2.3.0/gems/sequel-3.40.0/lib/sequel/core.rb:147:in `connect'     benchmarks/bm_sequel_create_string_columns.rb:4:in `<main>'

when puts env['database_url'] following output:

sqlite3::memory:

what correct way?

the adapter called sqlite, not sqlite3 when using sequel gem.


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