thr3ads.net - Rails - editing multiple models in one form [Jul 2007]

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Matt Daviss

2007-Jul-25 21:39 UTC

editing multiple models in one form

Very new to this but would appreciate a hand as this is driving me mad,
I''m trying to update both degree and assigned from a single form, the
degree section updates fine but assigned just retains the same values,
any help much appreciated!

my edit.rhtml file looks like:

<h1>Editing degree</h1>

<%= error_messages_for :degree %>

<%= start_form_tag :action => ''update'', :id =>
params[:id] %>

  <!--[form:degree]-->
  <p><label
for="degree_title">Title</label><br/>
<%= text_field ''degree'', ''title'' 
%></p>

<p><label
for="degree_detail">Detail</label><br/>
<%= text_area ''degree'', ''detail'' 
%></p>

<p><label
for="degree_careers">Careers</label><br/>
<%= text_area ''degree'', ''careers'' 
%></p>

<p><label
for="degree_contact">Contact</label><br/>
<%= text_field ''degree'', ''contact'' 
%></p>
  <!--[eoform:degree]-->

<p><label
for="assigned_grade">Contact</label><br/>
  <% for @assigned in @degree.assigneds %>
   <%= error_messages_for :assigned %>
     <% fields_for "assigned" do |f| %>
     <p><%= f.text_field :grade %></p>
   <%@quals=Qual.find(:all)%>
   <p><label for="assigned_qual_id">Qualification
ID</label><br/>
<%=collection_select :assigned, :qual_id, @quals,:id, :screen_qual%><br
/>
   <% end %>
 <% end %>


  <%= submit_tag "Edit" %>
<%= end_form_tag %>

<%= link_to ''Show'', :action => ''show'',
:id => @degree %> |
<%= link_to ''Back'', :action => ''list''
%>

and my controller file looks like:

class DegreesController < ApplicationController

  model :degree
  model :assigned
  def index
    list
    render :action => ''list''
  end

  # GETs should be safe (see
http://www.w3.org/2001/tag/doc/whenToUseGet.html)
  verify :method => :post, :only => [ :destroy, :create, :update ],
         :redirect_to => { :action => :list }

  def list
    @degree_pages, @degrees = paginate :degrees, :per_page => 10
  end

  def show
    @degree = Degree.find(params[:id])
  end

  def new
    @degree = Degree.new
    @assigned= Assigned.new(@params[:assigned])
  end

  def create
    #@degree = Degree.new(params[:degree])
    #@assigned =Assigned.new(@params[:assigned])
    #if @degree.save
     # @degree.assigneds <<@assigned

     @degree = Degree.new(params[:degree])
     @assigned = @degree.assigneds.build(params[:assigned])
    if @degree.save
       redirect_to :action => ''index''
     else
       render :action => ''new''
     end
   end




     # flash[:notice] = ''Degree was successfully created.''
      #redirect_to :action => ''list''
    #else
     # render :action => ''new''
    #end
 # end

  def edit
    @degree = Degree.find(params[:id])
  end

 def update
 @degree = Degree.find(params[:id])
         @degree.attributes = params[:degree]
         @degree.assigneds.each { |t| t.update_attributes[:assigned] }
         if @degree.valid? && @degree.assigneds.all?(&:valid?)
           @degree.save!
           @degree.assigneds.each(&:save!)
           redirect_to :action => ''show'', :id => @degree
         else
           render :action => ''edit''
        end
      end



  def destroy
    Degree.find(params[:id]).destroy
    redirect_to :action => ''list''
  end
end
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Matt Daviss

2007-Jul-25 21:54 UTC

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Re: editing multiple models in one form

Sorry the controller should look like this, tried something and then 
forgot to change it back

class DegreesController < ApplicationController

  model :degree
  model :assigned
  def index
    list
    render :action => ''list''
  end

  # GETs should be safe (see 
http://www.w3.org/2001/tag/doc/whenToUseGet.html)
  verify :method => :post, :only => [ :destroy, :create, :update ],
         :redirect_to => { :action => :list }

  def list
    @degree_pages, @degrees = paginate :degrees, :per_page => 10
  end

  def show
    @degree = Degree.find(params[:id])
  end

  def new
    @degree = Degree.new
    @assigned= Assigned.new(@params[:assigned])
  end

  def create
    #@degree = Degree.new(params[:degree])
    #@assigned =Assigned.new(@params[:assigned])
    #if @degree.save
     # @degree.assigneds <<@assigned

     @degree = Degree.new(params[:degree])
     @assigned = @degree.assigneds.build(params[:assigned])
    if @degree.save
       redirect_to :action => ''index''
     else
       render :action => ''new''
     end
   end




     # flash[:notice] = ''Degree was successfully created.''
      #redirect_to :action => ''list''
    #else
     # render :action => ''new''
    #end
 # end

  def edit
    @degree = Degree.find(params[:id])
  end

 def update
 @degree = Degree.find(params[:id])
         @degree.attributes = params[:degree]
         @degree.assigneds.each { |t| t.attributes = 
params[:assigned][t.id.to_s] }
         if @degree.valid? && @degree.assigneds.all?(&:valid?)
           @degree.save!
           @degree.assigneds.each(&:save!)
           redirect_to :action => ''show'', :id => @degree
         else
           render :action => ''edit''
        end
      end



  def destroy
    Degree.find(params[:id]).destroy
    redirect_to :action => ''list''
  end
end
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Matt_99

2007-Jul-25 22:33 UTC

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Re: editing multiple models in one form

Not to worry seem to have sorted it


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Ivor Paul

2007-Jul-26 07:22 UTC

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Re: editing multiple models in one form

I would really suggest you look at form_for and then fields_for which then
allows you to create a subset of the form specific to the second model that
you want to populate.

agile web development with rails page 491.

Regards
Ivor

On 7/26/07, Matt_99 <m.davis-pyHcBy/D9uhaa/9Udqfwiw@public.gmane.org>
wrote:>
>
> Not to worry seem to have sorted it
>
>
> >
>
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Martin Maciaszek

2007-Jul-26 07:39 UTC

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Re: editing multiple models in one form

On Jul 26, 9:22 am, "Ivor Paul"
<ivorp...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:> I would really suggest you look at form_for and then fields_for which then
> allows you to create a subset of the form specific to the second model that
> you want to populate.
>
> agile web development with rails page 491.
I had the same problem recently and came across this:
http://blog.jayfields.com/2007/03/rails-presenter-pattern.html
It basically wraps/aggregates several models into one. It makes your
controller leaner, too.

Cheers
Martin


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Paul Nichols

2007-Aug-21 09:43 UTC

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Editing multiple models in one form

I''m looking to try and get the edit function working on a page for
editing multiple models within the one form.

I can currently edit any child models of a parent if the child records
already exist, the problem lies with adding extra child records to the
parent record.

My update function currently looks like this:

def update
  @script = Script.find(params[:id])
    if params[:script_metadatas]
      params[:script_metadatas].each_with_index do |value, index|
        script_metadata
@script.script_metadatas.find_or_initialize_by_id(params[:script_metadatas][index.to_s]
? params[:script_metadatas][index.to_s][''id''] : nil)
        if script_metadata.new_record?
          @script.script_metadatas.create(params[:script_metadatas][index.to_s])
        else
         
script_metadata.update_attributes(params[:script_metadatas][index.to_s])
        end
      end
    end
  end
end

My view is such:

  <% form_tag :action => ''update'', :id => @script do
%>
    <div id="script_metadatas" align=center>
      <% @script.script_metadatas.each_with_index do |script_metadata,
index| %>
        <%= render :partial => ''script_metadata_fields'',
:locals => {
:script_metadata => script_metadata, :index => script_metadata.id } %>
      <% end %>
    </div>
    <div align=right>
      <%= render :partial => ''add_script_metadata_link'',
:locals => {
:index => @script.new_script_metadata_id } %>
    </div>
    <div align=right>
      <br />
      <%= submit_tag ''Update Metadata Info'' %>
    </div>
  <% end %>

My ''script_metadata_fields'' partial:

<div id="script_metadata_<%= index %>">
  <% fields_for "script_metadatas[#{index}]", script_metadata do
|f| %>
  &nbsp;&nbsp;&nbsp;Key: <%= f.text_field :meta_key %>
  Value: <%= f.text_field :meta_value %>
  <%= link_to_remote ''Remove'', :url => { :action =>
''remove_script_metadata'', :index => index } %>
  <% end %>
</div>

The problem i have is when i submit the data, i get the following error
message:

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.[]

All the correct parameters seem to be being passed, however the update
fails on the line beginning ''params[:script_metadatas].each_with_index
do |value, index|'' in my controller action, and the line immediately
following it.

Can anyone suggest why?
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