Hi all,
So far as I know, while using acts_as_ferret, we should add the
following declaration in the ActiveRecord model which is going to be
indexed:
acts_as_ferret({:fields => @@ferrect_fields})
in which @@ferrect_fields is a hash containing all the field to be
indexed. This is pretty much for some simple situations. But I got a
more complex situation that I want to define the fields to be indexed
for every instance of the same model.
My requirements are something like this:
Suppose we have a model "Product", in "Product" I've declared a
polymorphic relationship with model "Property1" and "Property2", the
following code will show this:
class Product < ActiveRecord::Base
belongs_to :property, :polymorphic => true
@@ferret_fields = {...}
acts_as_ferret({:fields => @@ferret_fields})
end
class Property1 < ActiveRecord::Base
has_one :product, :as => :property
end
class Property2 < ActiveRecord::Base
has_one :product, :as => :property
end
Now I want to provide full text search capability for "Product" and it's
obvious that "Product" should contains its "property" while being
indexed. So I should define "ferret_fields" class method in "Property1"
and "Property2" to collect all their fields and dynamically define the
corresponding method in "Product". The code is something like this:
class Property1 < ActiveRecord::Base
has_one :product, :as => :property
def self.ferret_fields
# return a hash containing all the fields to be indexed in aaf's
format
end
end
class Property2 < ActiveRecord::Base
has_one :product, :as => :property
def self.ferret_fields
# return a hash containing all the fields to be indexed in aaf's
format
end
end
class Product < ActiveRecord::Base
belongs_to :property, :polymorphic => true
@@ferret_fields = {...}
@@ferret_fields.merge!(Property1.ferret_fields)
@@ferret_fields.merge!(Property2.ferret_fields)
acts_as_ferret({:fields => @@ferret_fields})
Property1.ferret_fields.keys.each do |field|
define_method("#{field}") do
result = property.send("#{field}")
end
end
Property2.ferret_fields.keys.each do |field|
define_method("#{field}") do
result = property.send("#{field}")
end
end
end
But there are two problems in the above code:
1. If the property object in a product object is "Property1",
property.send("#{field}") in "Property2"'s block will cause a method
missing error, vice versa.
2. Say "Property1" has 500 fields as well as "Property2", each product
will be indexed using 1000 fields while only at most 500 fields contains
value.
How can I solve these problems and meet my requirements? Any ideas about
this?
--
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