On Nov 17, 5:45 pm, abusiek <[EMAIL PROTECTED]> wrote:
> Hi!
>
> I'm struggling with this for a while and i'm new to rails so it's
> quite frustrating ;)
>
> I need to create new model object based on old one with only few
> changes.
>
> I have desings -> has many -> lines -> has_many -> fields
>
> I've got input from user in array like this:
>
> field =>[
> line_id =>[ fiel_id => field_value]
> ]
>
> so I iterate:
>
> input[:field].each do |line_id, line|
> line.each do |field_id, field_value|
> design.lines.find(line_id).fields.find(field_id).value =
> field_value
> design.lines.find(line_id).fields.find(field_id).something =
> field_value
> end
> end
You're finding stuff and assigning new values to what was found but
not saving these changes back to the db as far as I can tell here.
Retrieve the field once
field=design.lines.find(line_id).fields.find(field_id)
update its values and then save it
field.something = ...
field.save (or field.save!)
You're not creating anything new, just updating old.
If you want a new field, you'll need to create it:
design.lines.find(line_id).fields.push(Field.new({hash-of-
attributes}))
This will add a new field to design's line with line_id.
You could probably do something like
new_field=Field.new(field.attributes)
to create a new field with the same attributes as the existing
'field', alter
its values as required and then push it onto the fields collection:
design.lines.find(line_id).fields.push(Field.new(new_field))
Be careful with names like 'field' - I don't know if they'll clash
with rails names.
Maybe also consider not chaining all those 'finds' together in one
line.
Find each thing and store it in a local variable or an instance
variable so
you won't have to get it again during the action.
--
Daniel Bush
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