acts_as_tree -- how to create new child

rubyonrails-talk
1

I have:

2

steven_noble wrote:

    @project.parent_id = :parent       respond_to do |format|

@project.parent = params[:parent]

3

Thanks Iian. I think the problem might be in my use of the following in the projects/show view:

    <%= link_to 'Create Subproject', new_project_path, :parent => @project.id %>

I have <%= debug @project.id %> in that projects/show view, which gives me:

    --- 21

However, in the subsequent projects/new view, where I have <%= debug :parent %>, I get:

    --- :parent

not

    --- 21

It seems link_to is not passing the value from show action (showing the parent project) to the new action (where I'm trying to create a child project).

Any thoughts?

Thanks again,

Steven.

4

Thanks Iian. I think the problem might be in my use of the following in the projects/show view:

    <%= link_to 'Create Subproject', new_project_path, :parent => @project.id %>

I have <%= debug @project.id %> in that projects/show view, which gives me:

    --- 21

However, in the subsequent projects/new view, where I have <%= debug :parent %>, I get:

    --- :parent

not

    --- 21

It seems link_to is not passing the value from show action (showing the parent project) to the new action (where I'm trying to create a child project).

Any thoughts?

Thanks again,

Steven.

5

Thanks. I'll try awesome_nested_set.

Iian seemed to be suggesting params[:parent] went into projects/new, but I'm struggling to get a value to projects/new (via :parents) in the first place, I assume for the reasons you've given.

Are you saying that params[:parent] goes into link_to to help me pass the value to projects/new?

s.

6

Hi Marnen,

Thanks for sticking with me and sorry for not yet getting it.

Am I not doing what you say with the following in projects/show?

<%= link_to 'Create Subproject', new_project_path, :parent => @project.id %>

And should I not be able to retrieve the value in projects/new with the following?

<%= debug :parent %>

s.

7

steven_noble wrote:

Hi Marnen,

Thanks for sticking with me and sorry for not yet getting it.

Am I not doing what you say with the following in projects/show?

<%= link_to 'Create Subproject', new_project_path, :parent => @project.id %>

And should I not be able to retrieve the value in projects/new with the following?

<%= debug :parent %>

For the third time: params[:parent], not :parent ! :parent is just a literal symbol. I already explained this; please reread.

Best,

8

I understand that's how you retrieve the value from the URL. My question related to how to add the value to the URL first place. As I suspected, the problem was with the syntax of my link_to. I've now solved that problem. For anyone else facing this problem, a working syntax is:

<%= link_to("Split Project Into Parts", {:action=>"new_project_path", :parent => @project.id}) %>

9

Sorry:

<%= link_to("Split Project Into Parts", {:controller=>"projects", :action=>"new", :parent => @project.id}) %>

10

Here's the complete code in case anyone else arrives here with the same problem.

No doubt hardened Rubyists will be able to tidy up my syntax, but this is passing all my specs right now so I'm happy. :slight_smile:

# app/models/project.rb

  acts_as_tree :order => "name"

# app/controllers/projects_controller.rb

  def new     if params[:parent] == nil       @parent = 0     else       @parent = Project.find(params[:parent]).id     end     ...   end

# app/views/projects/show.html.erb

   <%= link_to("Create A Sub-Project", {:controller=>"projects", :action=>"new", :parent => @project.id}) %>

# app/views/projects/new.html.erb

  <% form_for(@project) do |f| %>      ...      <%= f.hidden_field :parent_id, {:value => @parent} %>      ...   <% end %>