DAZ wrote:
> I have a family-tree structure to a person model.
>
> I want to be able to find people by specifying an array that
> corresponds to the family tree. So if Abe is grandpa, homer is dad and
> bart is the son, bart's array would be [abe,homer,bart].
Your requirement probably exceeds ActiveRecord's DSL.
Even if you did this...
class Person
has_many :children
has_many :grand_children, :through => :children
(with the :class_name => Person and whatnot)
...you cannot stitch them together in a find statement. You could of course
:include => [:children, :grand_children], but then there's no way to
distinguish
from three instances of the same table in your :conditions fields. You must hit
either 'name' or 'persons.name', but then 'persons' is ambiguous.
And even if all that worked, you then can't handle a variable length array.
The best bet is to count the elements in the array, then build a :joins string
that pulls in and numbers the persons table that number of times. Sketch what
you need in raw SQL first, such as in a query editor. Then build a :conditions
string (possibly using named replacements - :conditions => ['yack yack',
{:name1
=> name[1], :name2 => name[2], etc}]) that stamps in each name.
--
Phlip
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