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Josh Moore

2009-Mar-25 07:38 UTC

has_and_belongs_to_many relationship in nested forms

Hi,

I have two models (say model a and b) that are joined using the
has_and_belongs_to_many association.  In model A I want to be able to link
to model B in a form.  But, when I create a nested_form for model B I have a
problem.  Instead of linking to the exciting records in Model B.  It creates
new ones.  Is there anyway to use nested_forms so that model B objects are
linked to, but not created on submission?  When I create a new model A I
just want to link to, not create new model Bs.  Is this possible?

Thanks,

Josh

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Greg Donald

2009-Mar-25 15:28 UTC

head link

Re: has_and_belongs_to_many relationship in nested forms

On Wed, Mar 25, 2009 at 2:38 AM, Josh Moore
<joshsmoore-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:> Hi,
>
> I have two models (say model a and b) that are joined using the
> has_and_belongs_to_many association.  In model A I want to be able to link
> to model B in a form.  But, when I create a nested_form for model B I have
a
> problem.  Instead of linking to the exciting records in Model B.  It
creates
> new ones.  Is there anyway to use nested_forms so that model B objects are
> linked to, but not created on submission?  When I create a new model A I
> just want to link to, not create new model Bs.  Is this possible?
Yes, and it''s likely someone could help debug the issue if you post the
code.



-- 
Greg Donald
http://destiney.com/

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Josh Moore

2009-Mar-26 02:00 UTC

head link

Re: has_and_belongs_to_many relationship in nested forms

Here is the code.  I am sorry because this is work I cannot post the entire
application.  Thanks for all help and I hope this makes my problem clearer.

Thanks,

Josh


class StressTest < ActiveRecord::Base
  has_and_belongs_to_many :tst_definitions
  accepts_nested_attributes_for :tst_definitions
  has_many :tst_datas
end


class StressTestsController < ApplicationController
  layout ''tests.html''
  def index
    @stress_tests = StressTest.all
  end

  def new
    @stress_test = StressTest.new

    #want to add not create new tst_definitions
    @stress_test.tst_definitions<< TstDefinition.first
  end

  def create
    @stress_test = StressTest.new(params[:stress_test])
logger.info params.to_yaml
    if @stress_test.save
      flash[:notice] = "Successfully create Stress Test:
#{@stress_test.name
}"
      redirect_to :action => ''index''
    else
      render :action => ''new''
    end
  end

  def destroy
    @stress_test = StressTest.find(params[:id])
    @stress_test.destroy
    redirect_to :action => ''index''
  end
end



The new form
New Stress Test
<br/>

<% form_for(@stress_test) do |f| %>
  <table>
    <tr>
      <td><%= f.label :name %></td><td><%=
f.text_field :name %></td>
    </tr>
    <tr>
      <td><%= f.label :max_concurrent_scans
%></td><td><%= f.text_field
:max_concurrent_scans %></td>
    </tr>
    <tr>
      <td><%= f.label :number_of_runs %></td><td><%=
f.text_field
:number_of_runs %></td>
    </td>
  </table>

  <% f.fields_for :tst_definitions do |test_form| %>
    <ul>
      <li><%= test_form.select :name,
TstDefinition.find_by_sql("select id,
name from tst_definitions").collect {|test| [test.name, test.id]} %>
<%link_to ''Remove'', ''#remove_project'',
:class => ''remove_codesecure_project''
%></li>
    </ul>
    <%= link_to ''Add a project'',
''#add_project'', :class =>
''add_codesecure_project'' %>
  <% end -%>

  <br/>
  <%= f.submit ''submit'' %>

<% end -%>

Javascript that addess a new drop down so that multiple tst_definitions can
be added to a single stress_test
$(document).ready(function() {
 
$("a[class=\"add_codesecure_project\"]").click(function(event){
    var copy_object = $("ul").children().eq(0).clone()
    copy_object.appendTo("ul");
    var num_of_children = $("ul").children().size();
    copy_object.children("select").attr("id",
copy_object.children("select").attr("id").replace(/0/,
(num_of_children -
1)));
    copy_object.children("select").attr("name",
copy_object.children("select").attr("name").replace(/0/,
(num_of_children -
1)));
   
//alert(copy_object.children("select").attr("id").replace(/0/,
(num_of_children - 1)));

    //alert(copy_object.children("select").attr("id"))
    //alert(copy_object.attr("id"));

    add_remove_link();
  });

});


On Wed, Mar 25, 2009 at 11:28 PM, Greg Donald
<gdonald-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
>
> On Wed, Mar 25, 2009 at 2:38 AM, Josh Moore
<joshsmoore-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
> > Hi,
> >
> > I have two models (say model a and b) that are joined using the
> > has_and_belongs_to_many association.  In model A I want to be able to
> link
> > to model B in a form.  But, when I create a nested_form for model B I
> have a
> > problem.  Instead of linking to the exciting records in Model B.  It
> creates
> > new ones.  Is there anyway to use nested_forms so that model B objects
> are
> > linked to, but not created on submission?  When I create a new model A
I
> > just want to link to, not create new model Bs.  Is this possible?
>
> Yes, and it''s likely someone could help debug the issue if you
post the
> code.
>
>
>
> --
> Greg Donald
> http://destiney.com/
>
> >
>
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Josh Moore

2009-Mar-26 06:52 UTC

head link

Re: has_and_belongs_to_many relationship in nested forms

Hi,  After I looked into it some more I figured it out.  I had a little bit
of a concept mix up with accepts_nested_attributes_for.  Because I do not
want to create nested record.  I do not think it is appropriate for this
situation.  So I do not use it anymore.  Thanks for the help sorry to cause
people trouble.

Josh


On Thu, Mar 26, 2009 at 10:00 AM, Josh Moore
<joshsmoore-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
> Here is the code.  I am sorry because this is work I cannot post the entire
> application.  Thanks for all help and I hope this makes my problem clearer.
>
> Thanks,
>
> Josh
>
>
> class StressTest < ActiveRecord::Base
>   has_and_belongs_to_many :tst_definitions
>   accepts_nested_attributes_for :tst_definitions
>   has_many :tst_datas
> end
>
>
> class StressTestsController < ApplicationController
>   layout ''tests.html''
>   def index
>     @stress_tests = StressTest.all
>   end
>
>   def new
>     @stress_test = StressTest.new
>
>     #want to add not create new tst_definitions
>     @stress_test.tst_definitions<< TstDefinition.first
>   end
>
>   def create
>     @stress_test = StressTest.new(params[:stress_test])
> logger.info params.to_yaml
>     if @stress_test.save
>       flash[:notice] = "Successfully create Stress Test: #{@
> stress_test.name}"
>       redirect_to :action => ''index''
>     else
>       render :action => ''new''
>     end
>   end
>
>   def destroy
>     @stress_test = StressTest.find(params[:id])
>     @stress_test.destroy
>     redirect_to :action => ''index''
>   end
> end
>
>
>
> The new form
> New Stress Test
> <br/>
>
> <% form_for(@stress_test) do |f| %>
>   <table>
>     <tr>
>       <td><%= f.label :name %></td><td><%=
f.text_field :name %></td>
>     </tr>
>     <tr>
>       <td><%= f.label :max_concurrent_scans
%></td><td><%= f.text_field
> :max_concurrent_scans %></td>
>     </tr>
>     <tr>
>       <td><%= f.label :number_of_runs
%></td><td><%= f.text_field
> :number_of_runs %></td>
>     </td>
>   </table>
>
>   <% f.fields_for :tst_definitions do |test_form| %>
>     <ul>
>       <li><%= test_form.select :name,
TstDefinition.find_by_sql("select id,
> name from tst_definitions").collect {|test| [test.name, test.id]}
%> <%> link_to ''Remove'',
''#remove_project'', :class =>
''remove_codesecure_project''
> %></li>
>     </ul>
>     <%= link_to ''Add a project'',
''#add_project'', :class =>
> ''add_codesecure_project'' %>
>   <% end -%>
>
>   <br/>
>   <%= f.submit ''submit'' %>
>
> <% end -%>
>
> Javascript that addess a new drop down so that multiple tst_definitions can
> be added to a single stress_test
> $(document).ready(function() {
>  
$("a[class=\"add_codesecure_project\"]").click(function(event){
>     var copy_object = $("ul").children().eq(0).clone()
>     copy_object.appendTo("ul");
>     var num_of_children = $("ul").children().size();
>     copy_object.children("select").attr("id",
> copy_object.children("select").attr("id").replace(/0/,
(num_of_children -
> 1)));
>     copy_object.children("select").attr("name",
>
copy_object.children("select").attr("name").replace(/0/,
(num_of_children -
> 1)));
>    
//alert(copy_object.children("select").attr("id").replace(/0/,
> (num_of_children - 1)));
>
>     //alert(copy_object.children("select").attr("id"))
>     //alert(copy_object.attr("id"));
>
>     add_remove_link();
>   });
>
> });
>
>
>
> On Wed, Mar 25, 2009 at 11:28 PM, Greg Donald
<gdonald-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
>
>>
>> On Wed, Mar 25, 2009 at 2:38 AM, Josh Moore
<joshsmoore-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
>> > Hi,
>> >
>> > I have two models (say model a and b) that are joined using the
>> > has_and_belongs_to_many association.  In model A I want to be able
to
>> link
>> > to model B in a form.  But, when I create a nested_form for model
B I
>> have a
>> > problem.  Instead of linking to the exciting records in Model B. 
It
>> creates
>> > new ones.  Is there anyway to use nested_forms so that model B
objects
>> are
>> > linked to, but not created on submission?  When I create a new
model A I
>> > just want to link to, not create new model Bs.  Is this possible?
>>
>> Yes, and it''s likely someone could help debug the issue if you
post the
>> code.
>>
>>
>>
>> --
>> Greg Donald
>> http://destiney.com/
>>
>> >>
>>
>
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Aidan F

2009-Mar-26 08:23 UTC

head link

Re: has_and_belongs_to_many relationship in nested forms

So how would you do something like this?  I''m not sure whether I would
be better off going with accepts_nested_attributes_for
acts_as_taggable.  My example is a habtm relationship between books
and authors.  In a "new book" form, I would love to be able to connect
authors already existing in the database, but then being able to add a
new author if they don''t already exist.  Thanks!

On Mar 26, 2:52 am, Josh Moore
<joshsmo...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:> Hi,  After I looked into it some more I figured it out.  I had a little bit
> of a concept mix up with accepts_nested_attributes_for.  Because I do not
> want to create nested record.  I do not think it is appropriate for this
> situation.  So I do not use it anymore.  Thanks for the help sorry to cause
> people trouble.
>
> Josh
>
> On Thu, Mar 26, 2009 at 10:00 AM, Josh Moore
<joshsmo...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
> > Here is the code.  I am sorry because this is work I cannot post the
entire
> > application.  Thanks for all help and I hope this makes my problem
clearer.
>
> > Thanks,
>
> > Josh
>
> > class StressTest < ActiveRecord::Base
> >   has_and_belongs_to_many :tst_definitions
> >   accepts_nested_attributes_for :tst_definitions
> >   has_many :tst_datas
> > end
>
> > class StressTestsController < ApplicationController
> >   layout ''tests.html''
> >   def index
> >     @stress_tests = StressTest.all
> >   end
>
> >   def new
> >     @stress_test = StressTest.new
>
> >     #want to add not create new tst_definitions
> >     @stress_test.tst_definitions<< TstDefinition.first
> >   end
>
> >   def create
> >     @stress_test = StressTest.new(params[:stress_test])
> > logger.info params.to_yaml
> >     if @stress_test.save
> >       flash[:notice] = "Successfully create Stress Test: #{@
> > stress_test.name}"
> >       redirect_to :action => ''index''
> >     else
> >       render :action => ''new''
> >     end
> >   end
>
> >   def destroy
> >     @stress_test = StressTest.find(params[:id])
> >     @stress_test.destroy
> >     redirect_to :action => ''index''
> >   end
> > end
>
> > The new form
> > New Stress Test
> > <br/>
>
> > <% form_for(@stress_test) do |f| %>
> >   <table>
> >     <tr>
> >       <td><%= f.label :name %></td><td><%=
f.text_field :name %></td>
> >     </tr>
> >     <tr>
> >       <td><%= f.label :max_concurrent_scans
%></td><td><%= f.text_field
> > :max_concurrent_scans %></td>
> >     </tr>
> >     <tr>
> >       <td><%= f.label :number_of_runs
%></td><td><%= f.text_field
> > :number_of_runs %></td>
> >     </td>
> >   </table>
>
> >   <% f.fields_for :tst_definitions do |test_form| %>
> >     <ul>
> >       <li><%= test_form.select :name,
TstDefinition.find_by_sql("select id,
> > name from tst_definitions").collect {|test| [test.name, test.id]}
%> <%> > link_to ''Remove'',
''#remove_project'', :class =>
''remove_codesecure_project''
> > %></li>
> >     </ul>
> >     <%= link_to ''Add a project'',
''#add_project'', :class =>
> > ''add_codesecure_project'' %>
> >   <% end -%>
>
> >   <br/>
> >   <%= f.submit ''submit'' %>
>
> > <% end -%>
>
> > Javascript that addess a new drop down so that multiple
tst_definitions can
> > be added to a single stress_test
> > $(document).ready(function() {
> >  
$("a[class=\"add_codesecure_project\"]").click(function(event){
> >     var copy_object = $("ul").children().eq(0).clone()
> >     copy_object.appendTo("ul");
> >     var num_of_children = $("ul").children().size();
> >     copy_object.children("select").attr("id",
> >
copy_object.children("select").attr("id").replace(/0/,
(num_of_children -
> > 1)));
> >     copy_object.children("select").attr("name",
> >
copy_object.children("select").attr("name").replace(/0/,
(num_of_children -
> > 1)));
> >    
//alert(copy_object.children("select").attr("id").replace(/0/,
> > (num_of_children - 1)));
>
> >    
//alert(copy_object.children("select").attr("id"))
> >     //alert(copy_object.attr("id"));
>
> >     add_remove_link();
> >   });
>
> > });
>
> > On Wed, Mar 25, 2009 at 11:28 PM, Greg Donald
<gdon...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
>
> >> On Wed, Mar 25, 2009 at 2:38 AM, Josh Moore
<joshsmo...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
> >> > Hi,
>
> >> > I have two models (say model a and b) that are joined using
the
> >> > has_and_belongs_to_many association.  In model A I want to be
able to
> >> link
> >> > to model B in a form.  But, when I create a nested_form for
model B I
> >> have a
> >> > problem.  Instead of linking to the exciting records in Model
B.  It
> >> creates
> >> > new ones.  Is there anyway to use nested_forms so that model
B objects
> >> are
> >> > linked to, but not created on submission?  When I create a
new model A I
> >> > just want to link to, not create new model Bs.  Is this
possible?
>
> >> Yes, and it''s likely someone could help debug the issue
if you post the
> >> code.
>
> >> --
> >> Greg Donald
> >>http://destiney.com/
>
>
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Rails - Mar 2009 - has_and_belongs_to_many relationship in nested forms

has_and_belongs_to_many relationship in nested forms

Re: has_and_belongs_to_many relationship in nested forms

Re: has_and_belongs_to_many relationship in nested forms

Re: has_and_belongs_to_many relationship in nested forms

Re: has_and_belongs_to_many relationship in nested forms