gistfile1.rb

>> activity_fields.zip(ar.first)
TypeError: can't convert Hash into Array
        from (irb):45:in `zip'
        from (irb):45
        from :0
>> activity_fields.zip(ar.first.to_a)
=> [["curriculum_activity_id", ["enrollment_id", "2509140"]], ["name", ["curriculum_id", "6836"]], ["parent_id", ["name", "AML for Banks: The Office of Foreign Assets Control (OFAC)"]], ["lft", ["curriculum_activity_id", "1246"]], ["rgt", ["completed_on", nil]], ["curriculum_id", ["attempts_max", "0"]], ["course_id", ["completions_min", "0"]], ["enrollment_curriculum_activity_id", ["lft", "1"]], ["enrollment_id", ["enrollment_curriculum_activity_id", "1607986"]], ["course_enrollment_id", ["control_mode", "flow"]], ["started_on", ["parent_id", nil]], ["completed_on", ["attempts", "1"]], ["status", ["score", "0"]], ["score", ["status", "in-progress"]], ["attempts", ["started_on", nil]], ["control_mode", ["course_enrollment_id", "2577211"]], ["completions_min", ["course_id", "19"]], ["attempts_max", ["rgt", "2"]]]