Getting raise_on_type_mismatch

Hello, I am a newbie Ruby developer.

I have an "Bookstore" application consisting of Books Prices.

In the Edit page, I am trying to associate Books with Price. The Books
and Prices has a has_one relationship and belongs_to relationship.

class Book < ActiveRecord::Base
belongs_to :price
end

class Price < ActiveRecord:Base
   has_one :book
end

table book (
id int,
title varchar(20)
price_id int
);

table price (
id int
amount float
);

When I enter the Amount in the Edit page, I get the following
error:

Price(#-616403668) expected, got String(#-610120718)

/home/hemal/src/ruby/rubygems-1.1.1/gems/activerecord-2.1.0/lib/
active_record/associations/association_proxy.rb:214:in
`raise_on_type_mismatch'
/home/hemal/src/ruby/rubygems-1.1.1/gems/activerecord-2.1.0/lib/
active_record/associations/belongs_to_association.rb:22:in `replace'
/home/hemal/src/ruby/rubygems-1.1.1/gems/activerecord-2.1.0/lib/
active_record/associations.rb:1106:in `price='
/home/hemal/src/ruby/rubygems-1.1.1/gems/activerecord-2.1.0/lib/
active_record/base.rb:2361:in `send'
/home/hemal/src/ruby/rubygems-1.1.1/gems/activerecord-2.1.0/lib/
active_record/base.rb:2361:in `attributes='
/home/hemal/src/ruby/rubygems-1.1.1/gems/activerecord-2.1.0/lib/
active_record/base.rb:2360:in `each'
/home/hemal/src/ruby/rubygems-1.1.1/gems/activerecord-2.1.0/lib/
active_record/base.rb:2360:in `attributes='
/home/hemal/src/ruby/rubygems-1.1.1/gems/activerecord-2.1.0/lib/
active_record/base.rb:2261:in `update_attributes'
app/controllers/books_controller.rb:63:in `update'
app/controllers/books_controller.rb:62:in `update'

How do I fix the error? Any help will be greatly appreciated,

/hemal.

Hello, I am a newbie Ruby developer.

I have an "Bookstore" application consisting of Books Prices.

In the Edit page, I am trying to associate Books with Price. The Books
and Prices has a has_one relationship and belongs_to relationship.

class Book < ActiveRecord::Base
belongs_to :price
end

class Price < ActiveRecord:Base
has_one :book
end

It looks like you're trying to assign a string (presumably the value
entered on your page) to the book's price which won't work because
price= is expecting an instance of Price
railscasts.com has a good series on forms that interact with multiple
models (although I'm not entirely sure why you need that in this case)
Fred