module UiComponents
  class ValidatedOpenStruct < OpenStruct
    def self.validators_on(*)
      []
    end
  end

  module FormHelper
    def modelless_form(options, &block)
      model_params = options[:params] || params[options[:name]]
      struct = ValidatedOpenStruct.new(model_params)
      bootstrap_form_for(
        struct,
        as: options[:name],
        url: options[:url].to_s,
        method: options.fetch(:method, :post),
        &block
      )
    end
  end
end

module UiComponents
  class ValidatedOpenStruct < OpenStruct
    def self.validators_on(*)
      []
    end
  end

  module FormHelper
    def modelless_form(options, &block)
      model_params = options[:params] || params[options[:name]]
      struct = ValidatedOpenStruct.new(model_params)
      bootstrap_form_for(struct, as: options[:name], url: options[:url].to_s, &block)
    end
  end
end

--- 
+++ 
@@ -9,7 +9,13 @@
     def modelless_form(options, &block)
       model_params = options[:params] || params[options[:name]]
       struct = ValidatedOpenStruct.new(model_params)
-      bootstrap_form_for(struct, as: options[:name], url: options[:url].to_s, &block)
+      bootstrap_form_for(
+        struct,
+        as: options[:name],
+        url: options[:url].to_s,
+        method: options.fetch(:method, :post),
+        &block
+      )
     end
   end
 end
Allow passing method via options
