Question

在我的Rails应用程序中，我有一些默认的gravatar图像，但我需要它在两页中的大小不同。比如，在第一页图像高度应该是50px，在2nb页面上 - 100px。

问题是：我应该如何设置我的代码以避免重复方法并实现我的目标？附：我相信我应该在“gravatar_show”中为“image tag”添加一些更改，但我的所有尝试都失败了。

def gravatar_for(user)   # it's for 1'st page
  gravatar_id = Digest::MD5::hexdigest(user.email.downcase)
  gravatar_url = "https://secure.gravatar.com/avatar/#{gravatar_id}"
  image_tag(gravatar_url, alt: user.name, class: "gravatar img-rounded")
end

def gravatar_show(user)  # it's for 2'nd page(show)
  gravatar_for user
  ........# missing code......
end

======================================

当然，我可以复制并更改每个类，并在css中使用不同的类但它看起来很难看

def gravatar_for(user)
  gravatar_id = Digest::MD5::hexdigest(user.email.downcase)
  gravatar_url = "https://secure.gravatar.com/avatar/#{gravatar_id}"
  image_tag(gravatar_url, alt: user.name, class: "gravatar img-rounded")
end

def gravatar_show(user)
  gravatar_id = Digest::MD5::hexdigest(user.email.downcase)
  gravatar_url = "https://secure.gravatar.com/avatar/#{gravatar_id}"
  image_tag(gravatar_url, alt: user.name, class: "gravatar-show img-rounded")
end

Answer 1

使用延迟String评估"#{variable}"：

def gravatar_for(user, show = nil)
  gravatar_id = Digest::MD5::hexdigest(user.email.downcase)
  gravatar_url = "https://secure.gravatar.com/avatar/#{gravatar_id}"
  mod = "-show" if show
  image_tag(gravatar_url, alt: user.name, class: "gravatar#{mod} img-rounded")
end

如何在不同页面上对同一图像的样式不同

1 个答案: