thr3ads.net - Rails - At least one entry for DB [Mar 2012]

If this information is useful, please help other people find it:
Share via:

Soichi Ishida

2012-Mar-07 09:01 UTC

At least one entry for DB

Rails 3.1.3

I have models and their association like,

Video 1: -------- n: Script

When users newly create a Video, I want it to create the very first
Script entry together.

I have put

    @script = Script.new(:video_id => @video.id, :startp => 0, :text =>
''ToDo: '')

in Video controller, ''new'' action, but it doesn''t
work (:startp value is
determined for the first one).

How can I create a Script entity together with Video?

Also, if possible, I want that first Script entry to be undestroyable.
Do you think I can do it?

Thanks in advance,

soichi

-- 
Posted via http://www.ruby-forum.com/.

-- 
You received this message because you are subscribed to the Google Groups
"Ruby on Rails: Talk" group.
To post to this group, send email to
rubyonrails-talk-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org
To unsubscribe from this group, send email to
rubyonrails-talk+unsubscribe-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org
For more options, visit this group at
http://groups.google.com/group/rubyonrails-talk?hl=en.

Juan Pablo Avello

2012-Mar-07 09:43 UTC

head link

Re: At least one entry for DB

El miércoles 7 de marzo de 2012 10:01:30 UTC+1, Ruby-Forum.com User 
escribió:>
> Rails 3.1.3
>
> I have models and their association like,
>
> Video 1: -------- n: Script
>
> When users newly create a Video, I want it to create the very first
> Script entry together.
>
> I have put
>
>     @script = Script.new(:video_id => @video.id, :startp => 0, :text
=>
> ''ToDo: '')
>
> in Video controller, ''new'' action, but it
doesn''t work (:startp value is
> determined for the first one).
>
> How can I create a Script entity together with Video?
>
> Also, if possible, I want that first Script entry to be undestroyable.
> Do you think I can do it?
>
> Thanks in advance,
>
> soichi
>
> -- 
> Posted via http://www.ruby-forum.com/.
>
You can use either an after_create on the model or an observer which 
observes a Video creation. 
Personally, I usually prefer observers which seem less intrusive to me, 
giving a better to make it active or unactive, but some people think the 
other way.

To make your first script undestroyable, you can add a column to the model 
or a ''before_destroy'' which checks if its the first Script
created for a
given Video, a method to check this same condition and hide
''destroy''
links... there is a lot of ways to do this.


-- 
You received this message because you are subscribed to the Google Groups
"Ruby on Rails: Talk" group.
To view this discussion on the web visit
https://groups.google.com/d/msg/rubyonrails-talk/-/AF4bSfV5ic4J.
To post to this group, send email to
rubyonrails-talk-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org
To unsubscribe from this group, send email to
rubyonrails-talk+unsubscribe@googlegroups.com.
For more options, visit this group at
http://groups.google.com/group/rubyonrails-talk?hl=en.

Soichi Ishida

2012-Mar-08 02:41 UTC

head link

Re: At least one entry for DB

Thanks for your answer.

I will try after_create.

I have put

  after_create :create_first_script

  def create_first_script
    @video = Video.new(params[:video])
    @script = Script.new(:video_id => @video.id, :startp => 0, :text =>
''ToDo: '')
  end

in video.rb.
But I need to pass params[:video] somehow...

/videos/_form.html.erb (generated by scaffold) should do it, correct?

<%= form_for(@video) do |f| %>

  <div class="field">
    <%= f.label :title %><br />
    <%= f.text_field :title %>
  </div>
  <div class="field">
    <%= f.label :url %><br />
    <%= f.text_field :url %>
  </div>
  <div class="actions">
    <%= f.submit %>
  </div>
<% end %>


I am not sure how to pass the video object from here.
Could anyone give me tips?

soichi

-- 
Posted via http://www.ruby-forum.com/.

-- 
You received this message because you are subscribed to the Google Groups
"Ruby on Rails: Talk" group.
To post to this group, send email to
rubyonrails-talk-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org
To unsubscribe from this group, send email to
rubyonrails-talk+unsubscribe-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org
For more options, visit this group at
http://groups.google.com/group/rubyonrails-talk?hl=en.

Geoffroy Gomet

2012-Mar-08 09:44 UTC

head link

Re: At least one entry for DB

Hey,

The @video.id you are referring to is not yet existing as the @video object 
is not yet persisted into the db.
You have to first save the @video before accessing the id, that is when the 
after_create or after_save is triggered.
In your Video class, the after save has access to the @video instance 
through the self keyword (self.id in your case).

Another solution to your problem would be to use nested attributes (see 
accepts_nested_attributes_for in the rails docs)

I hope this helps.

Regards

Geoffroy

Op donderdag 8 maart 2012 03:41:40 UTC+1 schreef Ruby-Forum.com User het 
volgende:>
> Thanks for your answer.
>
> I will try after_create.
>
> I have put
>
>   after_create :create_first_script
>
>   def create_first_script
>     @video = Video.new(params[:video])
>     @script = Script.new(:video_id => @video.id, :startp => 0, :text
=>
> ''ToDo: '')
>   end
>
> in video.rb.
> But I need to pass params[:video] somehow...
>
> /videos/_form.html.erb (generated by scaffold) should do it, correct?
>
> <%= form_for(@video) do |f| %>
>
>   <div class="field">
>     <%= f.label :title %><br />
>     <%= f.text_field :title %>
>   </div>
>   <div class="field">
>     <%= f.label :url %><br />
>     <%= f.text_field :url %>
>   </div>
>   <div class="actions">
>     <%= f.submit %>
>   </div>
> <% end %>
>
>
> I am not sure how to pass the video object from here.
> Could anyone give me tips?
>
> soichi
>
> -- 
> Posted via http://www.ruby-forum.com/.
>
>
-- 
You received this message because you are subscribed to the Google Groups
"Ruby on Rails: Talk" group.
To view this discussion on the web visit
https://groups.google.com/d/msg/rubyonrails-talk/-/h-vGTdmMb8IJ.
To post to this group, send email to
rubyonrails-talk-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org
To unsubscribe from this group, send email to
rubyonrails-talk+unsubscribe-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org
For more options, visit this group at
http://groups.google.com/group/rubyonrails-talk?hl=en.

Soichi Ishida

2012-Mar-09 02:15 UTC

head link

Re: At least one entry for DB

Thanks for you answer.
> You have to first save the @video before accessing the id, that is when
> the
> after_create or after_save is triggered.
> In your Video class, the after save has access to the @video instance
> through the self keyword (self.id in your case).
>
I need to clarify this point.

When videos_controller.rb calls for ''create'' action, a new
instance gets
persisted, correct?
When doing so, ''after_create'' is called as well.  It seems to
me that
when ''after_create'' is called, the new video instance is
already
created.  Please correct me, if I''m wrong.

I tried this. but no good ( I knew it! )

  after_create :create_first_script

  def create_first_script
    @script = Script.new(:video_id => self.id, :startp => 0, :text => 
''ToDo: '')
  end


soichi

-- 
Posted via http://www.ruby-forum.com/.

-- 
You received this message because you are subscribed to the Google Groups
"Ruby on Rails: Talk" group.
To post to this group, send email to
rubyonrails-talk-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org
To unsubscribe from this group, send email to
rubyonrails-talk+unsubscribe-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org
For more options, visit this group at
http://groups.google.com/group/rubyonrails-talk?hl=en.

Colin Law

2012-Mar-09 08:58 UTC

head link

Re: Re: At least one entry for DB

On 9 March 2012 02:15, Soichi Ishida
<lists-fsXkhYbjdPsEEoCn2XhGlw@public.gmane.org>
wrote:> Thanks for you answer.
>
>> You have to first save the @video before accessing the id, that is when
>> the
>> after_create or after_save is triggered.
>> In your Video class, the after save has access to the @video instance
>> through the self keyword (self.id in your case).
>>
>
> I need to clarify this point.
>
> When videos_controller.rb calls for ''create'' action, a
new instance gets
> persisted, correct?
> When doing so, ''after_create'' is called as well.  It
seems to me that
> when ''after_create'' is called, the new video instance is
already
> created.  Please correct me, if I''m wrong.
Calling the create action in the controller does not create it in the
database, it is the call of ''save'' within the create action
that saves
it to the database.  The after_save callback will be called from
within save, after it is saved to the db and then the id will be
valid.
>
> I tried this. but no good ( I knew it! )
>
>  after_create :create_first_script
>
>  def create_first_script
>    @script = Script.new(:video_id => self.id, :startp => 0, :text
=>
> ''ToDo: '')
>  end
What do you think that code does?  It creates a new object in memory,
but you have not saved it to the database, so after the method is
called your new object is immediately lost.

Colin

-- 
You received this message because you are subscribed to the Google Groups
"Ruby on Rails: Talk" group.
To post to this group, send email to
rubyonrails-talk-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org
To unsubscribe from this group, send email to
rubyonrails-talk+unsubscribe@googlegroups.com.
For more options, visit this group at
http://groups.google.com/group/rubyonrails-talk?hl=en.

Geoffroy Gomet

2012-Mar-09 14:22 UTC

head link

Re: Re: At least one entry for DB

Indeed, you should save (persist) your object (script) after creating it or 
use the create (or create!) method instead or new:
@script = Script.new(:video_id => self.id, :startp => 0, :text =>
''ToDo: '')
@scipt.save

or

@script = Script.create(:video_id => self.id, :startp => 0, :text =>
''ToDo:
'')

regards

Geoffroy

On Friday, March 9, 2012 9:58:45 AM UTC+1, Colin Law
wrote:>
> On 9 March 2012 02:15, Soichi Ishida
<lists-fsXkhYbjdPsEEoCn2XhGlw@public.gmane.org> wrote:
> > Thanks for you answer.
> >
> >> You have to first save the @video before accessing the id, that is
when
> >> the
> >> after_create or after_save is triggered.
> >> In your Video class, the after save has access to the @video
instance
> >> through the self keyword (self.id in your case).
> >>
> >
> > I need to clarify this point.
> >
> > When videos_controller.rb calls for ''create'' action,
a new instance gets
> > persisted, correct?
> > When doing so, ''after_create'' is called as well.  It
seems to me that
> > when ''after_create'' is called, the new video
instance is already
> > created.  Please correct me, if I''m wrong.
>
> Calling the create action in the controller does not create it in the
> database, it is the call of ''save'' within the create
action that saves
> it to the database.  The after_save callback will be called from
> within save, after it is saved to the db and then the id will be
> valid.
>
> >
> > I tried this. but no good ( I knew it! )
> >
> >  after_create :create_first_script
> >
> >  def create_first_script
> >    @script = Script.new(:video_id => self.id, :startp => 0,
:text =>
> > ''ToDo: '')
> >  end
>
> What do you think that code does?  It creates a new object in memory,
> but you have not saved it to the database, so after the method is
> called your new object is immediately lost.
>
> Colin
>
>
-- 
You received this message because you are subscribed to the Google Groups
"Ruby on Rails: Talk" group.
To view this discussion on the web visit
https://groups.google.com/d/msg/rubyonrails-talk/-/39DRa9nuzzgJ.
To post to this group, send email to
rubyonrails-talk-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org
To unsubscribe from this group, send email to
rubyonrails-talk+unsubscribe-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org
For more options, visit this group at
http://groups.google.com/group/rubyonrails-talk?hl=en.

grentis

2012-Mar-09 15:49 UTC

head link

Re: At least one entry for DB

But something like 

@video = Video.new({.....})
@script = @video.scripts.build({ :startp => 0, :text => ''ToDo:
''})
@video.save

doesn''t work?

Il giorno mercoledì 7 marzo 2012 10:01:30 UTC+1, Ruby-Forum.com User ha 
scritto:>
> Rails 3.1.3
>
> I have models and their association like,
>
> Video 1: -------- n: Script
>
> When users newly create a Video, I want it to create the very first
> Script entry together.
>
> I have put
>
>     @script = Script.new(:video_id => @video.id, :startp => 0, :text
=>
> ''ToDo: '')
>
> in Video controller, ''new'' action, but it
doesn''t work (:startp value is
> determined for the first one).
>
> How can I create a Script entity together with Video?
>
> Also, if possible, I want that first Script entry to be undestroyable.
> Do you think I can do it?
>
> Thanks in advance,
>
> soichi
>
> -- 
> Posted via http://www.ruby-forum.com/.
>
>
-- 
You received this message because you are subscribed to the Google Groups
"Ruby on Rails: Talk" group.
To view this discussion on the web visit
https://groups.google.com/d/msg/rubyonrails-talk/-/4na9OI1z2WYJ.
To post to this group, send email to
rubyonrails-talk-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org
To unsubscribe from this group, send email to
rubyonrails-talk+unsubscribe@googlegroups.com.
For more options, visit this group at
http://groups.google.com/group/rubyonrails-talk?hl=en.

Soichi Ishida

2012-Mar-11 06:25 UTC

head link

Re: At least one entry for DB

Thanks! Finally I got it done.

  after_save :create_first_script

  private
  def create_first_script
    @script = Script.new(:video_id => self.id, :startp => 0, :text => 
''ToDo: '')
    @script.save
  end



soichi

-- 
Posted via http://www.ruby-forum.com/.

-- 
You received this message because you are subscribed to the Google Groups
"Ruby on Rails: Talk" group.
To post to this group, send email to
rubyonrails-talk-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org
To unsubscribe from this group, send email to
rubyonrails-talk+unsubscribe-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org
For more options, visit this group at
http://groups.google.com/group/rubyonrails-talk?hl=en.

Rails - Mar 2012 - At least one entry for DB

At least one entry for DB

Re: At least one entry for DB

Re: At least one entry for DB

Re: At least one entry for DB

Re: At least one entry for DB

Re: Re: At least one entry for DB

Re: Re: At least one entry for DB

Re: At least one entry for DB

Re: At least one entry for DB