thr3ads.net - Betternestedset talk - [Betternestedset-talk] Noob with trouble getting started with BetterNestedSet [Jan 2007]

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Chris O''Connor

2007-Jan-14 19:56 UTC

[Betternestedset-talk] Noob with trouble getting started with BetterNestedSet

Hello all,

Would love to use this plugin--looks exactly like what is needed to model a
given site''s hierarchy. And yet, as a noob (on many levels),
I''m having a
particularly hard time getting started with it.

A tutorial that walked through scaffolding and basic presentation (start to
finish) would be SO helpful.

For example, my migration throws an error when I try to apply the :scope =>
:root_id in the model, as shown in the example given at
http://wiki.rubyonrails.org/rails/pages/BetterNestedSet.

If I remove that scope qualification, I can play with it in the console
window, and I BELIEVE I understand the creation sequence and methods, but
when it comes to putting together solid scaffolding for this model and
actually SHOWING the FULL tree (or even partial trees from a particular
node), I get lost quickly. And how does one remove a node cleanly?

Any help would be appreciated.

And thanks for your patience.

-- 
Chris O''Connor
http://www.choipaint.com/
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Krishna Dole

2007-Jan-14 22:09 UTC

head link

[Betternestedset-talk] Noob with trouble getting started with BetterNestedSet

Hey Chris,

Welcome to the list. I agree we need a nice walk-through tutorial. Our
code may undergo some changes soon though, so I''m sort of waiting
until thing settle out before putting it together.
> For example, my migration throws an error when I try to apply the :scope
=>
> :root_id in the model, as shown in the example given at
> http://wiki.rubyonrails.org/rails/pages/BetterNestedSet.
What error are you seeing? Remember that you only need a scope if you
are working with multiple trees.
>
> If I remove that scope qualification, I can play with it in the console
> window, and I BELIEVE I understand the creation sequence and methods, but
> when it comes to putting together solid scaffolding for this model and
> actually SHOWING the FULL tree (or even partial trees from a particular
> node), I get lost quickly. And how does one remove a node cleanly?
It is up to you how you want to display the tree, but as a basic
example for showing the whole tree:
    @items = SetModel.root.full_set
then in the view you would loop through @items, and, quoting JCM: "You
can use style="margin-left:<%= item.level %>em;" in your view to
have
items indented according to their level." (There are performance
problems with calling #level so many times,  but it should get you
started).

If you want an AJAX tree viewer, LiveTree is a Rails plugin that works
nicely with nested sets:
http://www.epiphyte.ca/code/live_tree.html

The plugin handles cleanly deleting nodes for you (there is a callback
that destroys all descendants), so just call node.destroy.

k

Jean-Christophe Michel

2007-Jan-14 22:22 UTC

head link

[Betternestedset-talk] Noob with trouble getting started with BetterNestedSet

Hi,

Le 14 janv. 07, ? 20:56, Chris O''Connor a ?crit
:> For example, my migration throws an error when I try to apply the 
> :scope => :root_id in the model, as shown in the example given at
> http://wiki.rubyonrails.org/rails/pages/BetterNestedSet.
WHat error ? are you sure your table has a root_id entry ?
> If I remove that scope qualification, I can play with it in the 
> console window, and I BELIEVE I understand the creation sequence and 
> methods, but when it comes to putting together solid scaffolding for 
> this model and actually SHOWING the FULL tree (or even partial trees 
> from a particular node), I get lost quickly.
See the helper to do such thing. We will post additional examples on 
how to display and edit a whole tree soon.
> And how does one remove a node cleanly?
my_node.destroy

Jean-Christophe Michel
--
symetrie.com

Better Nested Set for rails:
http://opensource.symetrie.com/trac/better_nested_set

Chris O''Connor

2007-Jan-31 03:54 UTC

head link

[Betternestedset-talk] Noob with trouble getting started with BetterNestedSet

Thanks to all for the replies,

I''ve been on another project and haven''t had time to come back
to this, but
now here I am again.

With a class called ''TreeItem'', (table:
''tree_items''), and simple input from
the console I get this error:

# from ruby console window

>> child = TreeItem.new(:name => "my_computer")SyntaxError: ./script/../config/../config/../app/models/tree_item.rb:2:
parse er
ror, unexpected tASSOC, expecting tCOLON2 or ''['' or
''.''
        acts_as_nested_set, :scope => :root_id
                                     ^
        from C:/InstantRails/ruby/lib/ruby/gems/1.8/gems/activesupport-
1.3.1.584
8/lib/active_support/dependencies.rb:204:in
`load_without_new_constant_marking''
        from C:/InstantRails/ruby/lib/ruby/gems/1.8/gems/activesupport-
1.3.1.584
8/lib/active_support/dependencies.rb:204:in `load_file''
        from C:/InstantRails/ruby/lib/ruby/gems/1.8/gems/activesupport-
1.3.1.584
8/lib/active_support/dependencies.rb:343:in `new_constants_in''
        from C:/InstantRails/ruby/lib/ruby/gems/1.8/gems/activesupport-
1.3.1.584
8/lib/active_support/dependencies.rb:203:in `load_file''
        from C:/InstantRails/ruby/lib/ruby/gems/1.8/gems/activesupport-
1.3.1.584
8/lib/active_support/dependencies.rb:95:in `require_or_load''
        from C:/InstantRails/ruby/lib/ruby/gems/1.8/gems/activesupport-
1.3.1.584
8/lib/active_support/dependencies.rb:249:in `load_missing_constant''
        from C:/InstantRails/ruby/lib/ruby/gems/1.8/gems/activesupport-
1.3.1.584
8/lib/active_support/dependencies.rb:453:in `const_missing''
        from C:/InstantRails/ruby/lib/ruby/gems/1.8/gems/activesupport-
1.3.1.584
8/lib/active_support/dependencies.rb:465:in `const_missing''
        from (irb):3>>
My model file:

#tree_item.rb

class TreeItem < ActiveRecord::Base
    acts_as_nested_set, :scope => :root_id

end

my data in mysql from monitor:

mysql> select * from tree_items;
+----+---------+-----------+------+------+------------------------+
| id | root_id | parent_id | lft  | rgt  | name                   |
+----+---------+-----------+------+------+------------------------+
|  1 |       1 |      NULL |    1 |    2 | ruby                   |
|  2 |       2 |      NULL |    1 |    2 | rails                  |
|  3 |       3 |      NULL |    1 |    6 | computers              |
|  4 |       3 |         3 |    2 |    3 | apple                  |
|  5 |       3 |         3 |    4 |    5 | dell                   |
|  6 |       6 |      NULL |    1 |    8 | rails plug-ins         |
|  7 |       6 |         6 |    2 |    3 | better_nested_set      |
|  8 |       8 |      NULL |    1 |    2 | frameworks             |
|  9 |       6 |         6 |    4 |    5 | restful_authentication |
| 10 |       6 |         6 |    6 |    7 | authorization          |
| 11 |      11 |      NULL |    1 |    2 | databases              |
+----+---------+-----------+------+------+------------------------+
11 rows in set (0.13 sec)
(you''ll have to trust me I guess)...

What''s more curious is if I remove the :scope => :root_id I can work
with
the console all i like--making new children, saving them and moving them to
others. I can even list the items in a view; however, they are not in the
order I would hope for (due to no scope, yes?).

Is there something obvious I''m missing?

Thanks,
Chris




On 1/14/07, Krishna Dole <dontfall at gmail.com>
wrote:>
> Hey Chris,
>
> Welcome to the list. I agree we need a nice walk-through tutorial. Our
> code may undergo some changes soon though, so I''m sort of waiting
> until thing settle out before putting it together.
>
> > For example, my migration throws an error when I try to apply the
:scope
> =>
> > :root_id in the model, as shown in the example given at
> > http://wiki.rubyonrails.org/rails/pages/BetterNestedSet.
>
> What error are you seeing? Remember that you only need a scope if you
> are working with multiple trees.
>
> >
> > If I remove that scope qualification, I can play with it in the
console
> > window, and I BELIEVE I understand the creation sequence and methods,
> but
> > when it comes to putting together solid scaffolding for this model and
> > actually SHOWING the FULL tree (or even partial trees from a
particular
> > node), I get lost quickly. And how does one remove a node cleanly?
>
> It is up to you how you want to display the tree, but as a basic
> example for showing the whole tree:
>     @items = SetModel.root.full_set
> then in the view you would loop through @items, and, quoting JCM: "You
> can use style="margin-left:<%= item.level %>em;" in your
view to have
> items indented according to their level." (There are performance
> problems with calling #level so many times,  but it should get you
> started).
>
> If you want an AJAX tree viewer, LiveTree is a Rails plugin that works
> nicely with nested sets:
> http://www.epiphyte.ca/code/live_tree.html
>
> The plugin handles cleanly deleting nodes for you (there is a callback
> that destroys all descendants), so just call node.destroy.
>
> k
> _______________________________________________
> Betternestedset-talk mailing list
> Betternestedset-talk at rubyforge.org
> http://rubyforge.org/mailman/listinfo/betternestedset-talk
>


-- 
Chris O''Connor
718.788.4817
chriso1515 at gmail.com
http://www.choipaint.com/
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Krishna Dole

2007-Jan-31 14:53 UTC

head link

[Betternestedset-talk] Noob with trouble getting started with BetterNestedSet

Hey Chris,
Try removing the comma from
    acts_as_nested_set, :scope => :root_id

Cheers,
k

On 1/30/07, Chris O''Connor <chriso1515 at gmail.com>
wrote:> Thanks to all for the replies,
>
> I''ve been on another project and haven''t had time to come
back to this, but
> now here I am again.
>
> With a class called ''TreeItem'', (table:
''tree_items''), and simple input from
> the console I get this error:
>
> # from ruby console window
>
>
> >> child = TreeItem.new(:name => "my_computer")
> SyntaxError:
> ./script/../config/../config/../app/models/tree_item.rb:2:
> parse er
> ror, unexpected tASSOC, expecting tCOLON2 or ''['' or
''.''
>         acts_as_nested_set, :scope => :root_id
>                                      ^
>         from
> C:/InstantRails/ruby/lib/ruby/gems/1.8/gems/activesupport-1.3.1.584
> 8/lib/active_support/dependencies.rb:204:in
> `load_without_new_constant_marking''
>         from
> C:/InstantRails/ruby/lib/ruby/gems/1.8/gems/activesupport-1.3.1.584
> 8/lib/active_support/dependencies.rb:204:in `load_file''
>         from
> C:/InstantRails/ruby/lib/ruby/gems/1.8/gems/activesupport-
> 1.3.1.584
> 8/lib/active_support/dependencies.rb:343:in
> `new_constants_in''
>         from
> C:/InstantRails/ruby/lib/ruby/gems/1.8/gems/activesupport-1.3.1.584
> 8/lib/active_support/dependencies.rb:203:in `load_file''
>         from
> C:/InstantRails/ruby/lib/ruby/gems/1.8/gems/activesupport-1.3.1.584
> 8/lib/active_support/dependencies.rb:95:in
> `require_or_load''
>         from
> C:/InstantRails/ruby/lib/ruby/gems/1.8/gems/activesupport-
> 1.3.1.584
> 8/lib/active_support/dependencies.rb:249:in
> `load_missing_constant''
>         from
> C:/InstantRails/ruby/lib/ruby/gems/1.8/gems/activesupport-1.3.1.584
> 8/lib/active_support/dependencies.rb:453:in `const_missing''
>         from
> C:/InstantRails/ruby/lib/ruby/gems/1.8/gems/activesupport-1.3.1.584
> 8/lib/active_support/dependencies.rb:465:in `const_missing''
>         from (irb):3
> >>
>
> My model file:
>
> #tree_item.rb
>
> class TreeItem < ActiveRecord::Base
>     acts_as_nested_set, :scope => :root_id
>
> end
>
> my data in mysql from monitor:
>
> mysql> select * from tree_items;
> +----+---------+-----------+------+------+------------------------+
> | id | root_id | parent_id | lft  | rgt  | name                   |
> +----+---------+-----------+------+------+------------------------+
> |  1 |       1 |      NULL |    1 |    2 | ruby                   |
> |  2 |       2 |      NULL |    1 |    2 | rails                  |
> |  3 |       3 |      NULL |    1 |    6 | computers              |
> |  4 |       3 |         3 |    2 |    3 | apple                  |
> |  5 |       3 |         3 |    4 |    5 | dell                   |
> |  6 |       6 |      NULL |    1 |    8 | rails plug-ins         |
> |  7 |       6 |         6 |    2 |    3 | better_nested_set      |
> |  8 |       8 |      NULL |    1 |    2 | frameworks             |
> |  9 |       6 |         6 |    4 |    5 | restful_authentication |
> | 10 |       6 |         6 |    6 |    7 | authorization          |
> | 11 |      11 |      NULL |    1 |    2 | databases              |
> +----+---------+-----------+------+------+------------------------+
> 11 rows in set (0.13 sec)
> (you''ll have to trust me I guess)...
>
>  What''s more curious is if I remove the :scope => :root_id I
can work with
> the console all i like--making new children, saving them and moving them to
> others. I can even list the items in a view; however, they are not in the
> order I would hope for (due to no scope, yes?).
>
> Is there something obvious I''m missing?
>
> Thanks,
> Chris
>
>
>
>
>
> On 1/14/07, Krishna Dole < dontfall at gmail.com> wrote:
> >
> > Hey Chris,
> >
> > Welcome to the list. I agree we need a nice walk-through tutorial. Our
> > code may undergo some changes soon though, so I''m sort of
waiting
> > until thing settle out before putting it together.
> >
> > > For example, my migration throws an error when I try to apply the
:scope
> =>
> > > :root_id in the model, as shown in the example given at
> > >
> http://wiki.rubyonrails.org/rails/pages/BetterNestedSet.
> >
> > What error are you seeing? Remember that you only need a scope if you
> > are working with multiple trees.
> >
> > >
> > > If I remove that scope qualification, I can play with it in the
console
> > > window, and I BELIEVE I understand the creation sequence and
methods,
> but
> > > when it comes to putting together solid scaffolding for this
model and
> > > actually SHOWING the FULL tree (or even partial trees from a
particular
> > > node), I get lost quickly. And how does one remove a node
cleanly?
> >
> > It is up to you how you want to display the tree, but as a basic
> > example for showing the whole tree:
> >     @items = SetModel.root.full_set
> > then in the view you would loop through @items, and, quoting JCM:
"You
> > can use style="margin-left:<%= item.level %>em;" in
your view to have
> > items indented according to their level." (There are performance
> > problems with calling #level so many times,  but it should get you
> > started).
> >
> > If you want an AJAX tree viewer, LiveTree is a Rails plugin that works
> > nicely with nested sets:
> > http://www.epiphyte.ca/code/live_tree.html
> >
> > The plugin handles cleanly deleting nodes for you (there is a callback
> > that destroys all descendants), so just call node.destroy.
> >
> > k
> > _______________________________________________
> > Betternestedset-talk mailing list
> > Betternestedset-talk at rubyforge.org
> >
> http://rubyforge.org/mailman/listinfo/betternestedset-talk
> >
>
>
>
> --
> Chris O''Connor
> 718.788.4817
> chriso1515 at gmail.com
> http://www.choipaint.com/
> _______________________________________________
> Betternestedset-talk mailing list
> Betternestedset-talk at rubyforge.org
> http://rubyforge.org/mailman/listinfo/betternestedset-talk
>
>
>

Betternestedset talk - Jan 2007 - Noob with trouble getting started with BetterNestedSet

[Betternestedset-talk] Noob with trouble getting started with BetterNestedSet

[Betternestedset-talk] Noob with trouble getting started with BetterNestedSet

[Betternestedset-talk] Noob with trouble getting started with BetterNestedSet

[Betternestedset-talk] Noob with trouble getting started with BetterNestedSet

[Betternestedset-talk] Noob with trouble getting started with BetterNestedSet