Setter method for forms in multiple models

hello,

i am trying to collect data for multiple models thru a 3 model
controller.

i can create a setter method but the data that user inputs does not
show back in the form.
params show the data is being collected.

how is this solved in ruby. thanks for your help.

it easy to get data from a form to a specific model.

google rails multiple models single form [?]