问题
I have an attachments table that has multiple values (via polymorphic assoc). I'd like to be able to search for multiple values (like an AND in SQL) via thinking-sphinx.
For example:
class FieldValue < ActiveRecord::Base
belongs_to :customized, :polymorphic => true
end
class Attachment < ActiveRecord::Base
has_many :field_values, :as => :customized, :dependent => :destroy
define_index do
has field_values.field_id, :as => :field_ids, :type => :multi
indexes field_values.value, :as => :field_values, :type => :multi
set_property :enable_star => 1
set_property :min_infix_len => 3
end
end
My FieldValue model has one field (value), so using the above index definition, I could do something like:
Attachment.search :conditions => { :field_values => ["*5100*", "1"] }, :with => { :field_ids => [23, 24] }
But this doesn't technically do what I'm hoping for. The field_values should match the field_ids (similar to a select * from attachments where (field_value.id = 23 and field_value.value like '*5100*) and (field_value.id = 23 and field_value.value = '1')
(i know there are joins missing above :P)
Is it possible to do a search similar to this?
回答1:
Sphinx has no concept of key/value pairs, so you can't ask it to match values and field_ids on given field_values.
If you wanted to search on attachments matching a single value/id pair, a possible way around this would be to search on FieldValue instead, and group by customized_id
:
class FieldValue < ActiveRecord::Base
define_index do
indexes value
has field_id, customized_id
end
end
FieldValue.search :conditions => {:value => '1'}, :with => {:field_id => 23},
:group_by => 'customized_id', :group_function => :attr
The grouping will ensure you only get one match per Attachment.
However, this is no help matching multiple value/id pairs for an attachment, I'm afraid. I can't think of a way to do that with Sphinx off the top of my head.
回答2:
This can be done in several steps.
You'll need to reference FieldValue's ids in the Attachment index:
has field_values.id, :as => :field_values_ids
Get the ids for the FieldValue pairs you need:
v1 = FieldValue.search_for_ids(conditions: { value: "*5100*" }, with: { field_id: 23 })
v2 = FieldValue.search_for_ids(conditions: { value: "1" }, with: { field_id: 24 })
Search for Attachments that have these pairs:
r1 = Attachment.search(with: { field_values_ids: v1 })
r2 = Attachment.search(with: { field_values_ids: v2 })
Intersect the results:
r1.to_a & r2.to_a
Caveat: you lose pagination and ordering (See Pat's answer to my question).
来源:https://stackoverflow.com/questions/8824767/searching-multiple-polymorphic-items-using-thinking-sphinx