Does Ransack support the same polymorhpic belongs_to associations in its searches as MetaSearch does?
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14-07-2021 - |
Question
I am migrating from the MetaSearch gem to the Ransack gem for an upgrade to Rails 3.1 and I am having problems with my searches for polymorphic associations. The existing MetaSearch syntax isn't working for Ransack, but I couldn't find any documentation mentioning any syntax changes. Or whether this feature is supported in Ransack.
For example, from the MetaSearch github page, given the following classes:
class Article < ActiveRecord::Base
has_many :comments, :as => :commentable
end
class Post < ActiveRecord::Base
has_many :comments, :as => :commentable
end
class Comment < ActiveRecord::Base
belongs_to :commentable, :polymorphic => true
validates_presence_of :body
end
you can create a search field in your form like this (which is apparently a convention borrowed from Searchlogic):
<%= f.text_field :commentable_article_type_body_contains %>
I am using this type of syntax, which works perfectly in MetaSearch, but with Ransack my application is throwing an exception when the query parameter contains this field. The exception is:
ActiveRecord::EagerLoadPolymorphicError (Can not eagerly load the polymorphic association :ownable)
Does anyone know how to do this type of search in Ransack?
Solution
I was struggling with the same problem (although my error was different). I think your code needs to be:
<%= f.text_field :commentable_of_Article_type_body_contains %>
note the capital A
That worked for me. You can checkout Ernie's tests for polymorphic associations here (it's the last file on the page)
OTHER TIPS
In my particular case, I continued to receive a NameError (uninitialized constant) even when using the appropriate ransack syntax.
View
# NAME ERROR
<div class="form-group col-xs-12 col-sm-12 col-md-4 col-lg-4">
<%= f.label :identifiable_of_Drug_type_name_or_description_cont %>
<%= f.search_field :identifiable_of_Drug_type_name_or_description_cont, class: 'form-control form-control-bb' %>
</div>
I was able to remedy this by using a ransack alias:
Model
class Identifier < ApplicationRecord
# note the missing 'cont' predicate
ransack_alias :name_or_description, :identifiable_of_Drug_type_name_or_description
end
View
# NO ERROR
<div class="form-group col-xs-12 col-sm-12 col-md-4 col-lg-4">
# 'cont' predicate is declared in the view
<%= f.label :name_or_description_cont %>
<%= f.search_field :name_or_description_cont, class: 'form-control form-control-bb' %>
</div>