ruby - Rails 4.0.0 errors in controller: ActiveRecord::SubclassNotFound -


hi got error in controller:

activerecord::subclassnotfound in coursescontroller#create_course invalid single-table inheritance type: coursetemplate not subclass of course

the error occurs in line:

course = course.new(self.attributes)

what can fix ?

i've allready tried in model:

self.inheritance_column = :_type_disabled

but got error: 

mysql2::error: duplicate entry '4' key 'primary': insert `course_objects`

this error appears becaus id of course_object tried use again, id pk

you have remove id old object attributes:

obj_attributes = self.attributes obj_attributes.delete("id")  course = course.new(obj_attributes)

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