activerecord-hackery--ransack/docs/docs/going-further/polymorphic-search.md

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Polymorphic Searches	14

When making searches from polymorphic models it is necessary to specify the type of model you are searching.

For example:

Given two models

class House < ActiveRecord::Base
  has_one :location, as: :locatable
end

class Location < ActiveRecord::Base
  belongs_to :locatable, polymorphic: true
end

Normally (without polymorphic relationship) you would be able to search as per below:

Location.ransack(locatable_number_eq: 100).result

However when this is searched you will get the following error

ActiveRecord::EagerLoadPolymorphicError: Can not eagerly load the polymorphic association :locatable

In order to search for locations by house number when the relationship is polymorphic you have to specify the type of records you will be searching and construct your search as below:

Location.ransack(locatable_of_House_type_number_eq: 100).result

note the _of_House_type_ added to the search key. This allows Ransack to correctly specify the table names in SQL join queries.