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Where is the good place for adding custom datas when sending form (insert/update)

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Hi,

I'm new to rails. I'm learning and don't always know if i'm doing right.
So, let's assume that i that have table in the database:
table X:
field1
field2
custom_field

i've done
# rails g scaffold X field1:somethin field2:something custom_field:something

I've deleted a custom_field entries from _form.html.erb because i need
to fill this field depending on the field1. So i need to check what have
been sent in field1 and based on that fill the custom_field.

Ok, so i think i need to do this in the controller, but i do not fully
understand where.

x.update(x_params)

so do i need to modyfy x_params method whitch looks like:

def x_params
      params.require(:x).permit(:field1, :field2)
end

i'm so confused :)

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Where is the good place for adding custom datas when sending form (insert/update) jacki <collector@idealan.pl> - 2014-09-03 10:58 +0200
  Re: Where is the good place for adding custom datas when sending form   (insert/update) Robert Klemme <shortcutter@googlemail.com> - 2014-09-03 19:50 +0200

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