def checkdomains
@domains = Domain.all
#@domains.where(:confirmed => "yes").each do |f|
@domains.each do |f|
r = Whois.whois(f.domain)
if r.available? == true
EmailNotify.notify_email(f).deliver
end
end
end
当它出现一个无效的url(whois gem发出错误)时,此方法崩溃,并且不会继续检查其余的域.有什么方法可以让它继续检查其余的域,即使它崩溃了吗？至少在我可以解决每个域的搜索问题之前.
我是rails的新手,并且想知道如果数据库条目为空,是否可以在视图中有默认消息.例如,如果你有一个图像,你可以这样做:
<%= image_tag "#{post.imge}", :alt => 'Currently no image available'%>
因此,如果没有图像链接,那么就会出现"当前没有图像可用"但是如果你只是想显示一个字符串,那么:
<%= post.info %>
但如果post.info为空,我想显示另一条消息,如"目前没有可用信息"？我知道<%= post.info,:alt =>'目前没有可用的信息'%>不起作用但我似乎无法找到任何方法来做到这一点 - 可能是因为它很容易没有人有过问了问题哈哈!
我试图在帮助器中使用下面的解决方案,因为我想用于几个不同的条目,但我似乎无法让它工作 - 我在下面添加了我的代码:
module ApplicationHelper
def chk_blnk(gogo)
if gogo.blank?
"No img"
else
return gogo
end
end
end
当它接收变量(post.info)时我也不确定如何在视图中调用它我知道通常你会这样称呼它:
<%= chk_blnk %>
我很抱歉,如果这些是我试图寻找答案的基本问题,但我似乎无法找到任何答案.
查看Ruby块有什么好的概念方法？
如果我有一个数组,A,我将它传递给以下函数:
def MergeSort(&var)
...
end
然后运行该函数,将一个Array传递给它:
MergeSort(A)
数组A是否会被视为函数中的块？块的好处是什么,使用它们的好模式是什么？我意识到这些是一些无关的,可能是随机的问题; 任何澄清Ruby块的答案都会受到赞赏.
在我的index.html.erb页面中，当从 MSSQL 查询数据时，它显示为
Me&Mine. 我试过这个：
$("#3").text("<%= escape_javascript(raw render(:partial => "var") %>");
但它不起作用。
index.html.erb :
<%= link_to "Link", {:action => "AjaxView",:col => "colname"},
:update => "Ajaxcall", :remote => true %>
<tr>
<td id="#3" style="height:25px">data displayed here</td>
控制器：
def AjaxView
@vars= Var.find(:all,:conditions => { :varName=> "one" },:select=>(params[:col]))
respond_to do |format|
format.js { render :layout=>false }
end
end
AjaxView.js.erb：
if ( @col.to_s == "colName") {
$("#3").text("<%= escape_javascript(render(:partial => "var") %>");
}
elsif ( @col.to_s == "colName1")
{
$("#2").text("<%= escape_javascript(render(:partial => …在我的Rails应用程序,我想记录的时间user是last_seen.
现在,我在下面这样做SessionsHelper:
def sign_in(user)
.....
user.update_column(:last_seen, Time.zone.now)
self.current_user = user
end
但这不是很精确,因为用户可能会在上午8点登录,而在晚上,last_seen数据库列仍将包含该时间.
所以我想last_seen在用户采取行动时更新:
class ApplicationController
before_filter :update_last_seen
private
def update_last_seen
current_user.last_seen = Time.zone.now
current_user.save
end
end
但我不喜欢这种方法,因为数据库会因用户采取的每个操作而受到攻击.
那么什么可能是一个更好的替代品呢？
我在Ruby on Rails上有语法错误,我似乎无法解决它:
/home/francois/.rvm/gems/ruby-2.2.2@global/gems/actionpack-4.2.0/lib/action_dispatch/routing/route_set.rb:419:in `eval_block': /home/francois/.rvm/gems/ruby-2.2.2@global/gems/actionpack-4.2.0/lib/action_dispatch/routing/mapper.rb:124: syntax error, unexpected ')', expecting => (SyntaxError)
from /home/francois/.rvm/gems/ruby-2.2.2@global/gems/actionpack-4.2.0/lib/action_dispatch/routing/route_set.rb:439:in `block in clear!'
from /home/francois/.rvm/gems/ruby-2.2.2@global/gems/actionpack-4.2.0/lib/action_dispatch/routing/route_set.rb:439:in `each'
from /home/francois/.rvm/gems/ruby-2.2.2@global/gems/actionpack-4.2.0/lib/action_dispatch/routing/route_set.rb:439:in `clear!'
from /home/francois/.rvm/gems/ruby-2.2.2@global/gems/railties-4.2.0/lib/rails/application/routes_reloader.rb:35:in `block in clear!'
from /home/francois/.rvm/gems/ruby-2.2.2@global/gems/railties-4.2.0/lib/rails/application/routes_reloader.rb:33:in `each'
from /home/francois/.rvm/gems/ruby-2.2.2@global/gems/railties-4.2.0/lib/rails/application/routes_reloader.rb:33:in `clear!'
from /home/francois/.rvm/gems/ruby-2.2.2@global/gems/railties-4.2.0/lib/rails/application/routes_reloader.rb:15:in `reload!'
from /home/francois/.rvm/gems/ruby-2.2.2@global/gems/railties-4.2.0/lib/rails/application/routes_reloader.rb:26:in `block in updater'
from /home/francois/.rvm/gems/ruby-2.2.2@global/gems/activesupport-4.2.0/lib/active_support/file_update_checker.rb:75:in `call'
from /home/francois/.rvm/gems/ruby-2.2.2@global/gems/activesupport-4.2.0/lib/active_support/file_update_checker.rb:75:in `execute'
from /home/francois/.rvm/gems/ruby-2.2.2@global/gems/railties-4.2.0/lib/rails/application/routes_reloader.rb:27:in `updater'
from /home/francois/.rvm/gems/ruby-2.2.2@global/gems/railties-4.2.0/lib/rails/application/routes_reloader.rb:7:in `execute_if_updated'
from /home/francois/.rvm/gems/ruby-2.2.2@global/gems/railties-4.2.0/lib/rails/application/finisher.rb:69:in `block in <module:Finisher>'
from /home/francois/.rvm/gems/ruby-2.2.2@global/gems/railties-4.2.0/lib/rails/initializable.rb:30:in `instance_exec'
from /home/francois/.rvm/gems/ruby-2.2.2@global/gems/railties-4.2.0/lib/rails/initializable.rb:30:in `run'
from /home/francois/.rvm/gems/ruby-2.2.2@global/gems/railties-4.2.0/lib/rails/initializable.rb:55:in `block in run_initializers'
from /home/francois/.rvm/rubies/ruby-2.2.2/lib/ruby/2.2.0/tsort.rb:226:in `block in tsort_each'
from /home/francois/.rvm/rubies/ruby-2.2.2/lib/ruby/2.2.0/tsort.rb:348:in `block (2 …我有一个包含数字列表的数组,例如
[10, 30, 50, 54, 56, 95, 97, 99]
如果我提供一个数字,例如52,它需要返回数组中的下一个最小数字,在这种情况下,它将是50.
最干净的方法是什么？
请说明是否必须先排序数组.
我有一个ruby on rails application.I有2个下拉框.我必须根据第一个选择填充第二个下拉框.
HTML代码是
-Releases = Release.all
%table.grid.full
%tr
%td.grid.full_panels{:style => "width: 40%"}
Release:
%td.grid.full_panels{:style => "width: 40%"}
= select_tag "releases",options_from_collection_for_select(releases,"id","name",params[:releases]),:include_blank=>true
%td.grid.full_panels{:style => "width: 40%"}
Cycle:
%td.grid.full_panels{:style => "width: 40%"}
现在我需要循环下拉以从发布中填充.
请帮我解决这个问题.
我有以下内容:
@products = {
2 => [
#<Review id: 9, answer01: 3, score: 67, style_id: 2, consumer_id: 2,
branch_id: 2, business_id: 2>
],
15 => [
#<Review id: 10, answer01: 3, score: 67, style_id: 2, consumer_id: 2,
branch_id: 2, business_id: 2>,
#<Review id: 11, answer01: 3, score: 67, style_id: 2, consumer_id: 2,
branch_id: 2, business_id: 2>
]
}
我想平均与每个产品的哈希键相关的所有评论的分数.我怎样才能做到这一点？