sinatra 中的错误数组
为了管理地址簿应用程序中的错误，我初始化了一个这样的数组
err = Array.new
，然后当我发布内容时它会检查是否有空字段。如果是，对于每个空字段，它在数组中添加一条记录，然后重定向到 /add 页面，像这样，
post '/' do
if params[:fname] == ""
err.push "Insert a valid first name"
end
if params[:lname] == ""
err.push "insert a valid last name"
end
if params[:phone] == ""
err.push "insert a valid phone number"
end
if params[:mail] == ""
err.push "insert a valid e-mail address"
end
if err.empty?
c = Contatto.new
c.fname = params[:fname]
c.lname = params[:lname]
c.phone = params[:phone]
c.mail = params[:mail]
c.save
redirect '/'
else
redirect '/add'
end
end
然后添加页面读取数组是否有任何记录，如果是，则循环它以打印每条消息，
get '/add' do
@err = err
@title = 'Aggiungi'
erb :aggiungi
end
<% if @err.any? %>
<div class="error">
<% @err.each do |err| %>
<%= err %><br>
<% end %>
</div>
<% end %>
我认为错误是每次它从 post '/' 更改为 get '/add' 时都会重新初始化数组，因此结果是一个空数组...... 我该如何解决？谢谢大家！
To manage errors in my address book app i initialize an array like this
err = Array.new
and then when i post something it checks if there are empty fields. If yes, for each empty field it adds a record in the array, and then redirect to /add page, like this
post '/' do
if params[:fname] == ""
err.push "Insert a valid first name"
end
if params[:lname] == ""
err.push "insert a valid last name"
end
if params[:phone] == ""
err.push "insert a valid phone number"
end
if params[:mail] == ""
err.push "insert a valid e-mail address"
end
if err.empty?
c = Contatto.new
c.fname = params[:fname]
c.lname = params[:lname]
c.phone = params[:phone]
c.mail = params[:mail]
c.save
redirect '/'
else
redirect '/add'
end
end
then the add page reads if the array has any record and if yes, cycles it to print each message
get '/add' do
@err = err
@title = 'Aggiungi'
erb :aggiungi
end
<% if @err.any? %>
<div class="error">
<% @err.each do |err| %>
<%= err %><br>
<% end %>
</div>
<% end %>
i think the error is that it re-initialize the array every time it changes from post '/' to get '/add' and so the result is an empty array...
How can i solve? thank you everyone!
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如果您希望特定访问者的数据在请求之间保留，您需要将错误数组存储在会话或 cookie 中（会话可能最有意义）。
幸运的是，Sinatra 中的会话非常简单： http://www.sinatrarb.com/intro#Using%20Sessions 。启用后，您可以将几乎任何您想要的内容放入会话哈希中，因此使用
session[:errors] = []进行初始化并使用session[:errors] << “一个错误”应该给你你正在寻找的持久性。If you want data for a specific visitor to persist between requests you need to be storing the error array in either a session or a cookie (session probably makes the most sense).
Luckily sessions in Sinatra are pretty easy: http://www.sinatrarb.com/intro#Using%20Sessions . Once enabled you can put pretty much anything you want into the session hash, so initializing with
session[:errors] = []and pushing withsession[:errors] << "An error"should give you the persistence you are looking for.您正在创建一个局部变量并期望它在请求之间持续存在。这应该如何发生？ Sinatra 没有通灵能力，它只会记住你告诉它记住的内容，而这通常是通过某种数据库或客户端 cookie 来完成的。
通常，您应该在失败时呈现一个响应页面，利用您收集的错误，或者在成功时重定向，其中空错误数组不相关。
作为一种风格问题，执行此类操作的更 Ruby 方式是：
You're creating a local variable and expecting it to persist between requests. How is this supposed to happen? Sinatra is not psychic, it will only remember what you tell it to remember, and that's usually done through some kind of database or a client-side cookie.
Generally you should render a response page on failure, making use of the errors you've collected, or redirect on success, where the empty errors array is not relevant.
As a matter of style, the more Ruby way to do things like this is: