Newbie Question: multiple models - need ID from one table to

Rails
1

Hello,

I am creating a new record in my Elements table and that is pretty
straight forward. But I need to add an ID to the Elements table that
comes from another model - Pages. How can I create a record in the
Pages table and then use its ID to populate the Elements table?

I was trying something like this in the ElementsController:

def create
@page = Page.new(params[:page])
@element = Element.new(params[:element])
if @element.save
flash[:notice] = ‘{@element.type.capitalize} was successfully
created.’
flash[:inform] = true;
render :partial => show
end
end

But no luck so far - any ideas?

Thanks!

2

I’m not sure I’m understanding this properly , but I think this should
work:

@page = Page.new( params[:page] )
if @page.save
@element = Element.new( params[ :element ] )
@element.page_id = @page.id
if @element.save
# do something
else
# element did not save, do something else
else

Page did not save

end

3

Walksalong wrote:

I need to add an ID to the Elements table that
comes from another model - Pages. How can
I create a record in the Pages table and then use
its ID to populate the Elements table?

def create
@page = Page.new(params[:page])
@page.save # it won’t have an id until it’s saved
@element = Element.new(params[:element])
@element.page_id = @page.id
if @element.save
flash[:notice] = ‘{@element.type.capitalize} was successfully
created.’
flash[:inform] = true;
render :partial => show
end
end

hth,
Bill

4

Sorry, I meant:

@page = Page.new( params[:page] )
if @page.save
@element = Element.new( params[ :element ] )
@page = Page.find( :last, :conditions => “title = #{@page.title}” )
@element.page_id = @page.id
if @element.save
# do something
else
# element did not save, do something else
else

Page did not save

end

5

Also, if the page title is not unique, you could try adding a created_on
field to the page table and then selecting only pages which have been
created in the last minute with the same title.

matt-beedle.com

best-mobile-phones.org

6

ok, so how about this?

@page = Page.new( params[:page] )
if @page.save
@element = Element.new( params[ :element ] )
@page = Page.find( :last, @page.title )
@element.page_id = @page.id
if @element.save
# do something
else
# element did not save, do something else
else

Page did not save

end

7

Thanks Matt! I’ll try that now…

On Dec 21, 12:00 pm, Matt B. [email protected]

8

Is this line really needed?
@page = Page.find( :last, :conditions => “title = #{@page.title}” )

@page already exists and should respond to @page.id and you will save a
search on the database.

–ABS

9

Both work – Thanks!