Question

在厨师环境中，对于食谱，我有这些数组：

"envs": ["ci","ui","qa"],
"services": ["service_a","service_b","service_c","service_x"]

在模板文件中我使用：

<% @envs.each do |env| %>
file {
  <%
    logfiles = ""
    @services.each do |service|
      logfiles = logfiles + "\"" + "/remotelogs/" + @env + "/" + @service + "_syslog.log\", "
    end
    logfiles = logfiles.chomp(", ")
  %>
  path           => [<%= logfiles %>]    
}
 <% end %>

我得到的错误是：

no implicit conversion of nil into String
...
Template Context:
-----------------
on line #7
  5:       logfiles = ""
  6:       @services.each do |service|
  7:         logfiles = logfiles + "\"" + "/remotelogs/" + @env + "/" + @service + "_syslog.log\", "
  8:       end
  9:         logfiles = logfiles.chomp(", ")
 (erubis):7:in `+'
 (erubis):7:in `block (3 levels) in evaluate'
 (erubis):6:in `each'
 (erubis):6:in `block (2 levels) in evaluate'
 (erubis):2:in `each'
 (erubis):2:in `block in evaluate'

谁能告诉我我做错了什么？我猜测我的引号并没有很好地逃脱？

最终结果应该是三行（每个环境一个），并且对于每个行，路径应该具有值：

path           => ["/remotelogs/ci/service_a_syslog.log", "/remotelogs/ci/service_b_syslog.log", "/remotelogs/ci/service_c_syslog.log", "/remotelogs/ci/service_x_syslog.log"]

Answer 1

在这一行

env

应该是@env，而不是service。请注意，logfiles += "\"/remotelogs/#{env}/#{service}_syslog.log\", "也是如此。这是更好的

logfiles += %{"/remotelogs/#{env}/#{service}_syslog.log", }

或者如果您不想转义双引号，可以使用percent string literals：

NaN

Answer 2

如果我正确理解了您的代码，那么您正尝试重新实现join，但您只需要inspect：

@envs = ["ci","ui","qa"]
@services = ["service_a","service_b","service_c","service_x"]

@envs.each do |env|
  logfiles = @services.map{|service|
    "/remotelogs/#{env}/#{service}_syslog.log"
  }
  puts logfiles.inspect
end

输出：

["/remotelogs/ci/service_a_syslog.log", "/remotelogs/ci/service_b_syslog.log", "/remotelogs/ci/service_c_syslog.log", "/remotelogs/ci/service_x_syslog.log"]
["/remotelogs/ui/service_a_syslog.log", "/remotelogs/ui/service_b_syslog.log", "/remotelogs/ui/service_c_syslog.log", "/remotelogs/ui/service_x_syslog.log"]
["/remotelogs/qa/service_a_syslog.log", "/remotelogs/qa/service_b_syslog.log", "/remotelogs/qa/service_c_syslog.log", "/remotelogs/qa/service_x_syslog.log"]

根据您的ERB模板，它变为：

<% @envs.each do |env| %>
file {
  <%
    logfiles = @services.map{|service|
      "/remotelogs/#{env}/#{service}_syslog.log"
    }
  %>
  path           => <%= logfiles.inspect %>
}
<% end %>

从Ruby中的变量构建字符串

2 个答案: