Problems with displaying validation message

rubyonrails-talk
1

Hi,

Sorry I didn't post the right thing. I have two tables category and book. I have a hidden category_id field in the create book page. So by right if I submit an empty create book form, an error message box will show on the top of the page displaying my errors. But instead, I got the following error. Where did it go wrong.

Please help. Have been stuck for days.

I have also tried to use form_for with render partial but I can't submit my form. It just redirect back to the same page.

Thanks

..........category table........ id integer (primary key) cat_name varchar

validates_presence_of :name

.........book table............. id integer(primary key) name varchar author varchar price float category_id integer(foreign key)

validates_presence_of :name, :author

..........category model............ class Category < ActiveRecord::Base    has_many: books end

.........book model.............. class Book < ActiveRecord::Base    belongs_to: category end

.....book.rhtml (view)............. <%= error_messages_for 'book' %>

<b><u>Create New Book</u></b><p>

<% form_for :book, :action => :save_book, :html => {:id => :book} do |f| %>

  <%= f.hidden_field :category_id, :value => @category.id %>

  <%= button_to "Create", :action => :save_book, :id => :book %> <% end %> .......................................

......_form.rhtml................   <p>Name: <%= f.text_field :name %><p/>   <p>Address: <%= f.text_field :author %><p/>   <p>Phone Number: <%= f.text_field :price %><p/> ..................................

.........error message............... Called id for nil, which would mistakenly be 4 -- if you really wanted the id of nil, use object_id .....................................

2

Don't use button_to: that won't submit your form. Use submit_tag if you want a submit button.

Fred

3

Frederick Cheung wrote:

4

user splash wrote:

Hi,

I tried the submit tag. But nothing happen when the button is being filled and filled with the right data types.

Thanks

Hi,

I have no problems using the form_for now. But I'm still having problems with the validation I don't know where went wrong. There are no problems when all fields are filled and filled with the right data types. The following are my model, view, error message and table:

Please help. Thanks

..........category table........ id integer (primary key) cat_name varchar

validates_presence_of :name

.........book table............. id integer(primary key) name varchar author varchar price float category_id integer(foreign key)

validates_presence_of :name, :author

..........category model............ class Category < ActiveRecord::Base    has_many: books end

.........book model.............. class Book < ActiveRecord::Base    belongs_to: category end

.....book.rhtml (view)............. <%= error_messages_for 'book' %>

<b><u>Create New Book</u></b><p>

<% form_for :book, :action => :save_book, :html => {:id => :book} do |f| %>

  <%= f.hidden_field :category_id, :value => @category.id %>

  <%= button_to "Create", :action => :save_book, :id => :book %> <% end %> .......................................

......_form.rhtml................   <p>Name: <%= f.text_field :name %><p/>   <p>Address: <%= f.text_field :author %><p/>   <p>Phone Number: <%= f.text_field :price %><p/> ..................................

.........error message............... Called id for nil, which would mistakenly be 4 -- if you really wanted the id of nil, use object_id .....................................