快速背景:我正在设置一个快速而肮脏的模板方案,其中所有模板文件都命名为’* .erb’.填充数据驻留在yaml文件中.输出是带有模板名称的文件,减去’.erb’.
我没有用erb做太多工作,我得到错误“`result’:无法将String转换为Integer(TypeError)”……这对我来说没什么意义.
这是完成工作的类(generate_interface.rb):
#! /usr/bin/ruby
require 'yaml'
require 'erb'
class GenerateInterface
def initialize(yamlfile)
@yamlfile = yamlfile
@erbfiles = Dir.glob("*.erb")
end
def gobutton
# i -- interface. kept short because it's used all over the place in the erb files.
i = YAML.load_file( @yamlfile )
puts( "i: #{i.inspect}" )
puts( "i['test_id']: #{i['test_id'].inspect}" )
puts( "( i['test_id'] ).to_s: #{( i['test_id'] ).to_s}" )
@outfile=@erbfiles.map do
|erbfile|
puts( "erbfile: #{erbfile.inspect}" )
outfile = erbfile.gsub(/\.erb$/,"")
puts( "outfile: #{outfile.inspect}" )
template = File.open( erbfile, 'r' ) { |f| f.read }
puts( "template: #{template.inspect}" )
message = ERB.new(template, "%<>" )
puts( "message: #{message.inspect}" )
result=message.result
puts( "result: #{result.inspect}" )
File.open(outfile, 'w' ) { |f| f.write( message.result) }
end
end
end
yaml文件(test.yaml):
---
test_id: XXX123
模板文件(test.txt.erb):
Line 1
Line 2 test_id: <%= i['test_id'] %>
Line 3
驱动整个混乱的代码(test.rb):
#! /usr/bin/ruby
require "generate_interface"
test_interface = GenerateInterface.new( "test.yaml" )
test_interface.gobutton
最后,输出和错误消息:
$ruby -d test.rb
Exception `NoMethodError' at /usr/lib/ruby/1.8/rational.rb:78 - undefined method `gcd' for Rational(1, 2):Rational
i: {"test_id"=>XXX123}
i['test_id']: XXX123
( i['test_id'] ).to_s: XXX123
erbfile: "test.txt.erb"
outfile: "test.txt"
template: "Line 1\nLine 2 test_id: <%= i['test_id'] %>\nLine 3\n"
message: #<ERB:0xb74ac150 @src="_erbout = ''; _erbout.concat \"Line 1\\nLine 2 test_id: \"\n; _erbout.concat(( i['test_id'] ).to_s); _erbout.concat \"\\nLine 3\\n\"\n\n; _erbout", @safe_level="%<>", @filename=nil>
Exception `TypeError' at /usr/lib/ruby/1.8/erb.rb:715 - can't convert String into Integer
/usr/lib/ruby/1.8/erb.rb:715:in `result': can't convert String into Integer (TypeError)
from /usr/lib/ruby/1.8/erb.rb:714:in `call'
from /usr/lib/ruby/1.8/erb.rb:714:in `result'
from ./generate_interface.rb:26:in `gobutton'
from ./generate_interface.rb:17:in `map'
from ./generate_interface.rb:17:in `gobutton'
from test.rb:6
我认为_erbout.concat((i [‘test_id’]).to_s)有问题,但是当我明确打印(i [‘test_id’]).to_s时,我得到’XXX123′,这是我所期待的.
最佳答案 (您的generate_interface.rb粘贴错过了最终结束)
当前的问题是Erb.initialize的第二个参数是安全级别;第三个是修剪选项.您的修剪选项被解释为安全级别.
要解决这个问题,请改变
message = ERB.new(template, "%<>" )
至
message = ERB.new(template, nil, "%<>" )
第二个问题是变量i不能自动用于模板代码.要解决这个问题,你需要传递一个绑定,改变
result = message.result
至
result = message.result(binding)
在以下行中,将message.result更改为result