问题在于rails中的“强参数”。 我使用dragonfly上传图片。
问题是,如果我发送一个空表单,我没有得到任何错误处理参数。可能是什么原因?
控制器:
还有一种方法“创建”,它将图像保存在数据库中,并将用户发送到带有图片的页面。
def index
@gallery = Gallery.new
@galleries = Gallery.all
end
def create
@gallery = Gallery.new(gallery_params)
if @gallery.save
redirect_to galleries_path, flash: { success: 'Your Image was successfully save.' }
else
redirect_to :back, flash: { alert: "Your Image don't save." }
end
end
def gallery_params
params.require(:gallery).permit(:image)
end
查看:
= form_for @gallery do |f|
= f.file_field :image
= f.submit 'Submit', class: 'btn bth-primary btn-lg'
参数:
{"utf8"=>"✓", "authenticity_token"=>"8eotQtkj8SElqJLdHuOX8r+dWrCJRWTmVcyfd1mSLD/8MjWw/ElH/HCxZFSJ6oOWaxpbLbn4kAg5nlFycsgjHg==", "commit"=>"Submit"}
答案 0 :(得分:1)
这是预期的行为,请参阅ActionController::Parameters#require
的文档在这些情况下我通常做的是捕获异常并显示flash消息以通知用户。您也可以手动向模型添加错误。
def create
@gallery = Gallery.new(gallery_params)
if @gallery.save
redirect_to galleries_path, flash: { success: 'Your Image was successfully save.' }
else
redirect_to :back, flash: { alert: "Your Image don't save." }
end
rescue ActionController::ParameterMissing => e
redirect_to :back, flash: { alert: "Please attach an image." }
end