Rails -在ajax文件上传时从嵌套模型更新部分

resources :parent_models do
  resources :child_models do
    patch 'update_partial', on: :member
  end
end

class ChildModelsController < ApplicationController
  def update_partial
    @child_model = ChildModel.find(params[:id])
    # 更新部分数据
    if @child_model.update(child_model_params)
      render json: { success: true }
    else
      render json: { success: false }
    end
  end

  private

  def child_model_params
    params.require(:child_model).permit(:attribute1, :attribute2)
  end
end

$(document).on('change', '.file-input', function() {
  var file = this.files[0];
  var formData = new FormData();
  formData.append('child_model[attribute1]', 'new value');
  formData.append('child_model[attribute2]', 'new value');
  formData.append('child_model[file]', file);

  $.ajax({
    url: '/parent_models/:parent_model_id/child_models/:id/update_partial',
    type: 'PATCH',
    data: formData,
    processData: false,
    contentType: false,
    success: function(response) {
      if (response.success) {
        // 更新成功的处理逻辑
      } else {
        // 更新失败的处理逻辑
      }
    }
  });
});