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Fransiscus Xaverius

2007-Oct-08 00:52 UTC

Scroll Down Menu Problem

Please I need a help from you guys:

I have 2 models & 2 controllers:
1. app/controller/register_controller.rb & app/model/register.rb
2. app/controller/city_controller.rb & app/model/city.rb

---------------------------------------------------------
In db/migrate/002_creates_city.rb, I fill it :
---------------------------------------------------------
class CreateCitys < ActiveRecord::Migration
  def self.up
    create_table :citys do |t|
      t.column :citys, :string
    end

  say_with_time ''Adding Foreign Keys'' do
    execute ''ALTER TABLE registers ADD CONSTRAINT fk_reg_citys
    FOREIGN KEY ( city_name ) REFERENCES kotas( id ) ON DELETE CASCADE''
  end

  def self.down
    drop_table :kotas
  end
end

---------------------------------------------------------
I put has_many :registers in app/models/citys.rb
  And belongs_to :citys in app/models/registers.rb
---------------------------------------------------------

Then in app/view/register/_form.rhtml, I write this

...

<p><label
for="register_city_name">Tujuan</label><br/>

<%= select_tag(:city, "<option>-Select a city</option>"
+
options_from_collection_for_select(@find_city, :city, :city)) %>

</p>

...

-------------------------------------------------------------------
In app/controller/register_controller.rb i declare @find_city like this:
...
  def new
    @register = Register.new
    @find_city = City.find(:all, :order=>"city")
  end
...

And no changes for other scripts in controller that is from scaffold
generator.

-----------------------------------------------------------------------

I run the script, in  http://localhost:3000/register/new the city name
list is shown. But I after I submit, the next page show me this error:

NoMethodError in /register#create

Showing app/views/register/_form.rhtml where line #18 raised:

You have a nil object when you didn''t expect it!
You might have expected an instance of Array.
The error occurred while evaluating nil.inject

Extracted source (around line #18):

15:
16: <p><label
for="register_city_name">Tujuan</label><br/>
17:
18: <%= select_tag(:city, "<option>-Select a
city</option>" +
options_from_collection_for_select(@find_city, :city, :city)) %>
19:
20: </p>
21:

-----------------------------------------------------------------------

Please help me what should i do so the selected city in scroll down menu
can be inserted to database register for column city_name.


Thank You
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Fransiscus Xaverius

2007-Oct-08 00:56 UTC

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Re: Scroll Down Menu Problem

Sorry this the correction of MIGRATION SCRIPT:

---------------------------------------------------------
In db/migrate/002_creates_city.rb, I fill it :
---------------------------------------------------------
class CreateCitys < ActiveRecord::Migration
  def self.up
    create_table :citys do |t|
      t.column :citys, :string
    end

  say_with_time ''Adding Foreign Keys'' do
    execute ''ALTER TABLE registers ADD CONSTRAINT fk_reg_citys
    FOREIGN KEY ( city_name ) REFERENCES citys( id ) ON DELETE CASCADE''
  end

  def self.down
    drop_table :citys
  end
end
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Frederick Cheung

2007-Oct-08 01:00 UTC

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Re: Scroll Down Menu Problem

> -------------------------------------------------------------------
> In app/controller/register_controller.rb i declare @find_city like  
> this:
> ...
>   def new
>     @register = Register.new
>     @find_city = City.find(:all, :order=>"city")
>   end
> ...
>
> And no changes for other scripts in controller that is from scaffold
> generator.
>
> ---------------------------------------------------------------------- 
> -
>
> I run the script, in  http://localhost:3000/register/new the city name
> list is shown. But I after I submit, the next page show me this error:
>
> NoMethodError in /register#create
>Sounds like your create action (which you haven''t shown) is rendering  
the form partial again, and that you''re not setting @find_city in  
that action.
Normally you would only do this if the validation failed. You''ll need  
to set @find_city again (or better, put that code in its own method  
you can call from both new & create_

Fred


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Fransiscus Xaverius

2007-Oct-08 01:26 UTC

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Re: Scroll Down Menu Problem

Frederick Cheung wrote:>> And no changes for other scripts in controller that is from scaffold
>> generator.
>>
>> ---------------------------------------------------------------------- 
>> -
>>
>> I run the script, in  http://localhost:3000/register/new the city name
>> list is shown. But I after I submit, the next page show me this error:
>>
>> NoMethodError in /register#create
>>
> Sounds like your create action (which you haven''t shown) is
rendering
> the form partial again, and that you''re not setting @find_city in
> that action.
> Normally you would only do this if the validation failed. You''ll
need
> to set @find_city again (or better, put that code in its own method
> you can call from both new & create_
> 
> Fred

----------------------------------------------------------------------

Thanks for the advice. It works. The problem now is the selected city in 
scroll down cant be stored on database it always has no value. each time 
i select city and press submit, the error always like this. in City 
table only has ID and CITY for columns. Please need advice again.

1 error prohibited this register from being saved

There were problems with the following fields:

    * City can''t be blank
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Frederick Cheung

2007-Oct-08 01:38 UTC

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Re: Scroll Down Menu Problem

On 8 Oct 2007, at 02:26, Fransiscus Xaverius wrote:>
> Thanks for the advice. It works. The problem now is the selected  
> city in
> scroll down cant be stored on database it always has no value. each  
> time
> i select city and press submit, the error always like this. in City
> table only has ID and CITY for columns. Please need advice again.
>
> 1 error prohibited this register from being saved
>
> There were problems with the following fields:
>
>     * City can''t be blank
We can''t guess what''s in your create action.

Fred

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Fransiscus Xaverius

2007-Oct-08 01:45 UTC

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Re: Scroll Down Menu Problem

Frederick Cheung wrote:> On 8 Oct 2007, at 02:26, Fransiscus Xaverius wrote:
>> There were problems with the following fields:
>>
>>     * City can''t be blank
> 
> We can''t guess what''s in your create action.
> 
> Fred
--------------------------------------------------------------
here is Create action script in controller register_controller.rb. Each 
time i select city, the city always no value or can be selected. Please 
help me. Thanks.

...

  def create
    @register = Register.new(params[:register])
    @find_city = City.find(:all, :order=>"id")
    if @city.save
      flash[:notice] = ''Register was successfully created.''
      redirect_to :action => ''list''
    else
      render :action => ''new''
    end
  end

...
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Fransiscus Xaverius

2007-Oct-08 01:46 UTC

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Re: Scroll Down Menu Problem

Sorry again, Here is the corrections of action Create script.


 ...

   def create
     @register = Register.new(params[:register])
     @find_city = City.find(:all, :order=>"id")
     if @register.save
       flash[:notice] = ''Register was successfully created.''
       redirect_to :action => ''list''
     else
       render :action => ''new''
     end
   end

 ...
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Fransiscus Xaverius

2007-Oct-08 02:15 UTC

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Re: Scroll Down Menu Problem

Create Script is above and _form.rhtml script is :

...

<p><label
for="register_city">City</label><br/>

<%= select_tag (:city, "<option>-Select a
city</option>" +
options_from_collection_for_select(@find_city, "id",
"city")) %>

</p>

...

Please let me know what should I do? so the selected city can be saved 
without blank information. Thanks.
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Frederick Cheung

2007-Oct-08 08:21 UTC

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Re: Scroll Down Menu Problem

On 8 Oct 2007, at 02:46, Fransiscus Xaverius wrote:
>
> Sorry again, Here is the corrections of action Create script.
>
>    def create
>      @register = Register.new(params[:register])
> <%= select_tag (:city, "<option>-Select a
city</option>" +
> options_from_collection_for_select(@find_city, "id",
"city")) %>
>
Your parameters are in params, not params[:register]. Either change  
the form so that they are in params[:register], or do  Register.new 
(params)

Fred

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Fransiscus Xaverius

2007-Oct-08 10:55 UTC

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Re: Scroll Down Menu Problem

I made script _from.rhtml like this

<%= select_tag ''register[city]'', "<option
value=\"0\">Select a
city</option>" + options_from_collection_for_select(@find_city,
"city",
"city")) %>

And it works well. Thank you for your helping. And we need to put

-------------------------------------------
def Create
@find_city = City.find(:all, :order=>"id")
...
def Update
@find_city = City.find(:all, :order=>"id")
...
def Edit
@find_city = City.find(:all, :order=>"id")
...
def New
@find_city = City.find(:all, :order=>"id")
...
-------------------------------------------

in models/register.rb , we need to put validation so that ''Select a 
City'' will not stored into database of register.
-------------------------------------------
class Penerbangan < ActiveRecord::Base

  belongs_to :citys
  ...
  validates_presence_of :city_name
  ...
end
-------------------------------------------

Thank you for your helping Bro. [Double Thumbs For You]
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Fransiscus Xaverius

2007-Oct-08 11:31 UTC

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Re: Scroll Down Menu Problem

One Question again
---------------------------

How to make our selected city from scrolldown menu is consistent in Edit 
Area. I mean automatic select city that we have selected and stored in 
database before.

Thanks.
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Fransiscus Xaverius

2007-Oct-08 12:01 UTC

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Re: Scroll Down Menu Problem

I got the answer from my trial and Error (^-^)

The answer is :

<%= select_tag ''register[city]'', "<option 
value=\"#{@register.city}\">#{@register.city}</option>"
+
options_from_collection_for_select(@find_city, "city",
"city")) %>


Funny Right, I ask and I answer self
(^-^)

This case is closed

I''ll be right back with new question.

Thanks to Fred
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