mysql - How to migrate data from ExpressionEngine to Rails App -

right have system using expressionengine, rebuilding scratch using ruby on rails. i'm trying figure out how existing data in expressionengine database , migrate new ruby on rails app.

i have read ee supports exporting data wordpress.

i'm not looking tool recommendation (though if 1 exists great). i'm asking rather, "what best way this?" first time migrating data non-rails app.

ee version: 2.9.2

what need migrate: data, example post, users, content in tables. but, don't need template or html since webapp re-created in rails.

note: rails database postgresql or maybe mongodb.

thanks