objective c - design & logic - Most efficient way to save reordered UITable rows -


enter image description here

the blue table called routine , other 1 called exercise.

routine.exercise has many-to-many relationship exercise.routine.

i have uitableview user can re-arrange order of items , having problems thinking way design entities can reorder them & save reorder position.

what want order position in uitable of exercises in x routine.

e.g: routine has been selected , has following items in following order.

e1 e3 e2

my problem comes when can not put order column in exercise entity because many-to-many relationship. thus, exercise have different position in different routines.

i though on creating different entity hold position data mean i'd have create x amount of column having in mind amount of columns have greater typical number of exercises routine have. far viable option wondering if there better solution there lots of rows unused , while storing mean looping through empty ones , nullify them in case.

can think better way or there better way in xcode store position of item in uitable? can store array in field?

i using coredata.

edit in response answer: enter image description here

a many-to-many relationship can re-written 2 one-to-many relationships join table in middle. is, create exerciseroutine table (or better name) represents matching of exercise , routine , put data specific relationship in there.

the less flexible way -- since want know order of exercises in routine -- store order array, connected routine.

(but recommend option #1 better general purpose technique.)


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