Forum: Ruby on Rails Problem with params

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6d432a544f913c22997fade1e51fa7be?d=identicon&s=25 Preethi Naveen (Guest)
on 2006-03-22 12:28
(Received via mailing list)

I am trying to create a new record in a database by modifying the create
method generated by scaffold. I have a situation where i want to add new
student and while creating a new student, i am able to choose the
the student belongs to. However when i say create, i get an error saying
that Department expected, got string.

*Parameters*: {"commit"=>"Create", "student"=>{"department"=>"1"}

the method

def create
@student =[:student])      #error caused at this line

The department field is of type integer
so it looks like it expects an integer value while department returns a
string. How do i convert it to an integer so that i can succesfully add
new student to the database

67c06429f18c528461f65fc80f5b8281?d=identicon&s=25 Andy Shen (Guest)
on 2006-03-22 12:54
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I think even if you use integer you will still get similar error,
except it will say Fixnum instead of string.
Because it seems like :department should be of object Department, not
the foreign key.

9d1f5d2d9de70bd9a934f557dc95a406?d=identicon&s=25 Daniel ----- (liquid)
on 2006-03-22 12:59
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In your model you could explicitly state the relationship

class Student < ActionRecord::Base
  belongs_to :department, :class_name="department", :foriegn_key =>

Then in the veiw use
<%= text_field "student", "department_id" %>

or similar for a select box.

I had similar problems when I was trying to get a form working and found
that by doing this it worked.  I think there is supposed to be some
magic that does this for you but I don't seem to have much luck with it.

Ada41dd2cc7c8be6ec92ea663d3c1c7d?d=identicon&s=25 Dattatraya Gokhale (Guest)
on 2006-03-22 13:23
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is the foreign key department_id a field in the main table student?

On 3/22/06, Liquid <> wrote:
> Then in the veiw use
> > Andy
> > department
> > line
> > >
> > _______________________________________________

9d1f5d2d9de70bd9a934f557dc95a406?d=identicon&s=25 Daniel ----- (liquid)
on 2006-03-22 23:06
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Yes...  It follows the belong_to requirements.  But when you state is
specifically the field name could be any name of type int.
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