Ohm::IndexNotFound: Ohm::IndexNotFound on adding to a collection or a set

[mattcr...@mac.com]

I have a simple model to hold a set of hierarchical tags

class BrowserTerm < Ohm::Model

attribute :label

index :label

attribute :display_name

set :parents, :BrowserTerm

set :children, :BrowserTerm

end

When I go to use these, however, I end up with an Ohm::IndexNotFound: Ohm::IndexNotFound exception.

1.9.3-p362 :008 > bt=BrowserTerm.create(label: "ROOT_TERM", display_name: "Browser Root")

 => #<BrowserTerm:0x007fc4839767e8 @attributes={:label=>"ROOT_TERM", :display_name=>"Browser Root"}, @_memo={}, @errors={}, @id="10"> 

1.9.3-p362 :010 > bt.children.add(label: "CHILD1", display_name: "First Child")

Ohm::IndexNotFound: Ohm::IndexNotFound

from /Users/Matt1/.rvm/gems/ruby-1.9.3-p362/gems/ohm-1.2.0/lib/ohm.rb:1418:in `toindices'

from /Users/Matt1/.rvm/gems/ruby-1.9.3-p362/gems/ohm-1.2.0/lib/ohm.rb:1414:in `block in filters'

from /Users/Matt1/.rvm/gems/ruby-1.9.3-p362/gems/ohm-1.2.0/lib/ohm.rb:1414:in `each'

from /Users/Matt1/.rvm/gems/ruby-1.9.3-p362/gems/ohm-1.2.0/lib/ohm.rb:1414:in `map'

from /Users/Matt1/.rvm/gems/ruby-1.9.3-p362/gems/ohm-1.2.0/lib/ohm.rb:1414:in `filters'

from /Users/Matt1/.rvm/gems/ruby-1.9.3-p362/gems/ohm-1.2.0/lib/ohm.rb:826:in `find'

from /Users/Matt1/.rvm/gems/ruby-1.9.3-p362/gems/ohm-1.2.0/lib/ohm.rb:938:in `block in collection'

from (irb):10

from /Users/Matt1/.rvm/gems/ruby-1.9.3-p362/gems/railties-3.2.6/lib/rails/commands/console.rb:47:in `start'

from /Users/Matt1/.rvm/gems/ruby-1.9.3-p362/gems/railties-3.2.6/lib/rails/commands/console.rb:8:in `start'

from /Users/Matt1/.rvm/gems/ruby-1.9.3-p362/gems/railties-3.2.6/lib/rails/commands.rb:41:in `<top (required)>'

from script/rails:6:in `require'

from script/rails:6:in `<main>'

I tried using Jruby and vanilla ruby (1.9.3-p362).

Using ohm (1.2.0) 

Using redis (3.0.2) 

Any ideas?

[Michel Martens]

Yes, the problem is that bt.children.add(...) expects a model
instance, so you can rewrite it like this:

bt.children.add(BrowserTerm.create(label: "CHILD1", display_name:
"First Child"))

If you prefer, you can create a helper method:

class BrowserTerm < Ohm::Model
...

def add_child(dict)
children.add(self.class.create(dict))
end
end

[mattcr...@mac.com]

Thanks!  That seems to work fine… until I go to fetch the children.  For some reason, there seems to be an issue getting them back:

class BrowserTerm < Ohm::Model

attribute :label

index :label

attribute :display_name

list :parents, :BrowserTerm

list :children, :BrowserTerm

def add_child(dict) 

    children.add(self.class.create(dict)) 

  end

    def add_parent(dict) 

    parents.add(self.class.create(dict)) 

  end

end

root=BrowserTerm.create(label: "ROOT", display_name: "ROOT")

=> #<BrowserTerm:4 label="ROOT" display_name="ROOT" parents=#<List (BrowserTerm): []> children=#<List (BrowserTerm): []>>

root.children.add(BrowserTerm.create(label: "child", display_name: "child"))

=> 1

root.children

=> #<List (BrowserTerm): ["5"]>

root.children.first

=> nil

[Michel Martens]

On 11 March 2014 16:23, <mattcr...@mac.com> wrote:
> add


Try root.children.push(...) instead.

[mattcr...@mac.com]

NoMethodError: undefined method `push' for #<List (BrowserTerm): []>

[Michel Martens]

Which version are you using?

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[mattcr...@mac.com]

[Michel Martens]

Can you double check? Or maybe take a look at the code of the installed gem.

The reason for that is because List#push is defined in 1.2.0, so the
error you are
gettin is very strange. See this:

https://github.com/soveran/ohm/blob/1.2.0/lib/ohm.rb#L246-L249