Add config to turn off boolean conversions

lib/ransack/configuration.rb

@@ -11,7 +11,8 @@ module Ransack
       :ignore_unknown_conditions => true,
       :hide_sort_order_indicators => false,
       :up_arrow => '▼'.freeze,
-      :down_arrow => '▲'.freeze
+      :down_arrow => '▲'.freeze,
+      :sanitize_scope_args => true
     }
 
     def configure
@@ -98,6 +99,22 @@ module Ransack
       self.options[:down_arrow] = opts[:down_arrow].freeze if opts[:down_arrow]
     end
 
+    # Ransack sanitizes many values in your custom scopes into booleans.
+    # [1, '1', 't', 'T', 'true', 'TRUE'] all evaluate to true.
+    # [0, '0', 'f', 'F', 'false', 'FALSE'] all evaluate to false.
+    #
+    # This default may be globally overridden in an initializer file like
+    # `config/initializers/ransack.rb` as follows:
+    #
+    # Ransack.configure do |config|
+    #   # Accept my custom scope values as what they are.
+    #   config.sanitize_custom_scope_booleans = false
+    # end
+    #
+    def sanitize_custom_scope_booleans=(boolean)
+      self.options[:sanitize_scope_args] = boolean
+    end
+
     # By default, Ransack displays sort order indicator arrows in sort links.
     # The default may be globally overridden in an initializer file like
     # `config/initializers/ransack.rb` as follows:

lib/ransack/search.rb

@@ -123,12 +123,18 @@ module Ransack
     private
 
     def add_scope(key, args)
+      sanitized_args = if Ransack.options[:sanitize_scope_args]
+        sanitized_scope_args(args)
+      else
+        args
+      end
+
       if @context.scope_arity(key) == 1
         @scope_args[key] = args.is_a?(Array) ? args[0] : args
       else
-        @scope_args[key] = args.is_a?(Array) ? sanitized_scope_args(args) : args
+        @scope_args[key] = args.is_a?(Array) ? sanitized_args : args
       end
-      @context.chain_scope(key, sanitized_scope_args(args))
+      @context.chain_scope(key, sanitized_args)
     end
 
     def sanitized_scope_args(args)