我不太确定如何正确调试它，但尝试了几种不同的方法，虽然浪费了时间，但没有解决问题。我办公室里至少有 4 个其他人可以在安装了相同版本的 ruby 和 rubygems 的相同机器上执行此代码而没有错误。
这是我正在执行的代码:
status = Open4::popen4( "swfmill simple stdin stdout" ) do | pid, stdin, stdout, stderr |
stdin.write( config )
stdin.close
bytes = stdout.read
errors = stderr.read
end
我在这条线路上收到“总线错误”:
errors = stderr.read
如果我评论该行，我会在该行收到“Segementation Fault”:
bytes = stdout.read
我显然在使用 Open4 库并执行外部进程。当直接从终端执行时，以及当此 Ruby 代码在此特定 Rails 应用程序之外运行时，即使在不同的、更简单的 Rails 应用程序中，这个外部进程也能完美运行。
要重现错误，我只需要像这样执行我的特定测试方法:
ruby test/unit/swf_generator_test.rb --name test_get_bytes
我在配备 Intel Core 2 Duo 2.53 GHz 和 8GB RAM 的 MacBook Pro 上运行 Snow Leopard Mac OS X 10.6.2 (10C540)。
ruby -v && gem -v
ruby 1.8.7 (2009-06-12 patchlevel 174) [i686-darwin10.2.0]
1.3.5
我在 GDB 中执行了这段代码，发现我的 libxml 和 libxslt 库都没有正确安装。我能够安装这两个库，现在 GDB 不再告诉我任何我认为有用的信息。这是 GDB 的当前输出:
gdb ruby
GNU gdb 6.3.50-20050815 (Apple version gdb-1344) (Fri Jul 3 01:19:56 UTC 2009)
Copyright 2004 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and you are
welcome to change it and/or distribute copies of it under certain conditions.
Type "show copying" to see the conditions.
There is absolutely no warranty for GDB. Type "show warranty" for details.
This GDB was configured as "x86_64-apple-darwin"...Reading symbols for shared libraries .... done
(gdb) run test/unit/swf_generator_test.rb --name test_get_bytes
Starting program: /usr/local/bin/ruby test/unit/swf_generator_test.rb --name test_get_bytes
Reading symbols for shared libraries +++... done
Reading symbols for shared libraries . done
Reading symbols for shared libraries . done
Reading symbols for shared libraries . done
Reading symbols for shared libraries . done
Reading symbols for shared libraries . done
Reading symbols for shared libraries . done
Reading symbols for shared libraries . done
Reading symbols for shared libraries . done
Reading symbols for shared libraries .. done
Reading symbols for shared libraries . done
Reading symbols for shared libraries . done
Reading symbols for shared libraries ... done
Reading symbols for shared libraries . done
Reading symbols for shared libraries . done
Reading symbols for shared libraries . done
Reading symbols for shared libraries .. done
Reading symbols for shared libraries . done
Reading symbols for shared libraries .. done
Reading symbols for shared libraries . done
Reading symbols for shared libraries . done
Reading symbols for shared libraries . done
Reading symbols for shared libraries .... done
Reading symbols for shared libraries . done
Reading symbols for shared libraries . done
Reading symbols for shared libraries ... done
Loaded suite test/unit/swf_generator_test
Started
Reading symbols for shared libraries .. done
Program received signal EXC_BAD_ACCESS, Could not access memory.
Reason: KERN_PROTECTION_FAILURE at address: 0x00007fff81973e90
0x0000000100045bf1 in gc_mark ()
(gdb)
在更新我的 libxml 和 libxslt 库后，我还重建/重新安装了所有的 gem。我通过运行来做到这一点:
sudo gem pristine --all
最后，这是我针对此特定异常的控制台日志条目:
Process: ruby [5059]
Path: /usr/local/bin/ruby
Identifier: ruby
Version: ??? (???)
Code Type: X86-64 (Native)
Parent Process: bash [5050]
Date/Time: 2010-01-21 11:31:45.468 -0800
OS Version: Mac OS X 10.6.2 (10C540)
Report Version: 6
Exception Type: EXC_BAD_ACCESS (SIGABRT)
Exception Codes: KERN_INVALID_ADDRESS at 0x000000000000000e
Crashed Thread: 0 Dispatch queue: com.apple.main-thread
Application Specific Information:
abort() called
Thread 0 Crashed: Dispatch queue: com.apple.main-thread
0 libSystem.B.dylib 0x00007fff819befe6 __kill + 10
1 libSystem.B.dylib 0x00007fff81a5fe32 abort + 83
2 libruby.dylib 0x000000010001b887 rb_check_type + 0
3 libruby.dylib 0x00000001000a5427 sigsegv + 84
4 libSystem.B.dylib 0x00007fff819d0eaa _sigtramp + 26
5 ??? 0x00007fff5fbd7410 0 + 140734799639568
6 libruby.dylib 0x0000000100045a50 mark_tbl + 44
7 libruby.dylib 0x0000000100045a71 rb_mark_tbl + 31
8 libruby.dylib 0x0000000100059286 mark_load_arg + 40
9 libruby.dylib 0x000000010004635f gc_mark_children + 1687
10 libruby.dylib 0x0000000100045c74 gc_mark + 221
11 libruby.dylib 0x0000000100045882 mark_locations_array + 61
12 libruby.dylib 0x00000001000459fc rb_gc_mark_locations + 59
13 libruby.dylib 0x0000000100047620 garbage_collect + 389
14 libruby.dylib 0x0000000100044c2d ruby_xmalloc + 107
15 libruby.dylib 0x0000000100033a76 scope_dup + 100
16 libruby.dylib 0x000000010002ab7d rb_yield_0 + 2646
17 libruby.dylib 0x0000000100034dbd proc_invoke + 1020
18 libruby.dylib 0x0000000100034f73 rb_proc_call + 39
19 libruby.dylib 0x000000010002e061 call_cfunc + 252
20 libruby.dylib 0x000000010002d16a rb_call0 + 1548
21 libruby.dylib 0x000000010002ebca rb_call + 711
22 libruby.dylib 0x0000000100025dc4 rb_eval + 9919
23 libruby.dylib 0x00000001000251d0 rb_eval + 6859
24 libruby.dylib 0x000000010002dc1b rb_call0 + 4285
25 libruby.dylib 0x000000010002ebca rb_call + 711
26 libruby.dylib 0x0000000100025dc4 rb_eval + 9919
27 libruby.dylib 0x00000001000249fc rb_eval + 4855
28 libruby.dylib 0x000000010002716e rb_eval + 14953
29 libruby.dylib 0x000000010002a8f8 rb_yield_0 + 2001
30 libruby.dylib 0x0000000100034dbd proc_invoke + 1020
31 libruby.dylib 0x0000000100034f73 rb_proc_call + 39
32 libruby.dylib 0x000000010002e061 call_cfunc + 252
33 libruby.dylib 0x000000010002d16a rb_call0 + 1548
34 libruby.dylib 0x000000010002ebca rb_call + 711
35 libruby.dylib 0x0000000100025dc4 rb_eval + 9919
36 libruby.dylib 0x00000001000251d0 rb_eval + 6859
37 libruby.dylib 0x000000010002dc1b rb_call0 + 4285
38 libruby.dylib 0x000000010002ebca rb_call + 711
39 libruby.dylib 0x0000000100025dc4 rb_eval + 9919
40 libruby.dylib 0x00000001000249fc rb_eval + 4855
41 libruby.dylib 0x000000010002dc1b rb_call0 + 4285
42 libruby.dylib 0x000000010002ebca rb_call + 711
43 libruby.dylib 0x00000001000260fb rb_eval + 10742
44 libruby.dylib 0x0000000100025617 rb_eval + 7954
45 libruby.dylib 0x000000010002dc1b rb_call0 + 4285
46 libruby.dylib 0x000000010002ebca rb_call + 711
47 libruby.dylib 0x0000000100025dc4 rb_eval + 9919
48 libruby.dylib 0x00000001000270e5 rb_eval + 14816
49 libruby.dylib 0x000000010002dc1b rb_call0 + 4285
50 libruby.dylib 0x000000010002ebca rb_call + 711
51 libruby.dylib 0x000000010002ed88 rb_f_send + 170
52 libruby.dylib 0x000000010002e080 call_cfunc + 283
53 libruby.dylib 0x000000010002d16a rb_call0 + 1548
54 libruby.dylib 0x000000010002ebca rb_call + 711
55 libruby.dylib 0x00000001000260fb rb_eval + 10742
56 libruby.dylib 0x0000000100024f5a rb_eval + 6229
57 libruby.dylib 0x00000001000251d0 rb_eval + 6859
58 libruby.dylib 0x00000001000251d0 rb_eval + 6859
59 libruby.dylib 0x000000010002dc1b rb_call0 + 4285
60 libruby.dylib 0x000000010002ebca rb_call + 711
61 libruby.dylib 0x0000000100025dc4 rb_eval + 9919
62 libruby.dylib 0x0000000100035764 block_pass + 460
63 libruby.dylib 0x000000010002473a rb_eval + 4149
64 libruby.dylib 0x000000010002a8f8 rb_yield_0 + 2001
65 libruby.dylib 0x000000010002ad2f rb_yield + 42
66 libruby.dylib 0x00000001000061e4 rb_ary_each + 100
67 libruby.dylib 0x000000010002e098 call_cfunc + 307
68 libruby.dylib 0x000000010002d16a rb_call0 + 1548
69 libruby.dylib 0x000000010002ebca rb_call + 711
70 libruby.dylib 0x0000000100025dc4 rb_eval + 9919
71 libruby.dylib 0x00000001000249fc rb_eval + 4855
72 libruby.dylib 0x000000010002dc1b rb_call0 + 4285
73 libruby.dylib 0x000000010002ebca rb_call + 711
74 libruby.dylib 0x0000000100025dc4 rb_eval + 9919
75 libruby.dylib 0x0000000100035764 block_pass + 460
76 libruby.dylib 0x000000010002473a rb_eval + 4149
77 libruby.dylib 0x000000010002a8f8 rb_yield_0 + 2001
78 libruby.dylib 0x000000010002ad2f rb_yield + 42
79 libruby.dylib 0x00000001000061e4 rb_ary_each + 100
80 libruby.dylib 0x000000010002e098 call_cfunc + 307
81 libruby.dylib 0x000000010002d16a rb_call0 + 1548
82 libruby.dylib 0x000000010002ebca rb_call + 711
83 libruby.dylib 0x0000000100025dc4 rb_eval + 9919
84 libruby.dylib 0x00000001000249fc rb_eval + 4855
85 libruby.dylib 0x000000010002dc1b rb_call0 + 4285
86 libruby.dylib 0x000000010002ebca rb_call + 711
87 libruby.dylib 0x0000000100025dc4 rb_eval + 9919
88 libruby.dylib 0x00000001000249fc rb_eval + 4855
89 libruby.dylib 0x000000010002dc1b rb_call0 + 4285
90 libruby.dylib 0x000000010002ebca rb_call + 711
91 libruby.dylib 0x0000000100025dc4 rb_eval + 9919
92 libruby.dylib 0x0000000100025617 rb_eval + 7954
93 libruby.dylib 0x000000010002dc1b rb_call0 + 4285
94 libruby.dylib 0x000000010002ebca rb_call + 711
95 libruby.dylib 0x000000010002614c rb_eval + 10823
96 libruby.dylib 0x0000000100025617 rb_eval + 7954
97 libruby.dylib 0x000000010002dc1b rb_call0 + 4285
98 libruby.dylib 0x000000010002ebca rb_call + 711
99 libruby.dylib 0x0000000100025dc4 rb_eval + 9919
100 libruby.dylib 0x0000000100025617 rb_eval + 7954
101 libruby.dylib 0x000000010002dc1b rb_call0 + 4285
102 libruby.dylib 0x000000010002ebca rb_call + 711
103 libruby.dylib 0x0000000100025dc4 rb_eval + 9919
104 libruby.dylib 0x0000000100025b16 rb_eval + 9233
105 libruby.dylib 0x000000010002dc1b rb_call0 + 4285
106 libruby.dylib 0x000000010002ebca rb_call + 711
107 libruby.dylib 0x0000000100025dc4 rb_eval + 9919
108 libruby.dylib 0x000000010002dc1b rb_call0 + 4285
109 libruby.dylib 0x000000010002ebca rb_call + 711
110 libruby.dylib 0x0000000100025dc4 rb_eval + 9919
111 libruby.dylib 0x0000000100025f54 rb_eval + 10319
112 libruby.dylib 0x000000010002a8f8 rb_yield_0 + 2001
113 libruby.dylib 0x0000000100034dbd proc_invoke + 1020
114 libruby.dylib 0x0000000100032ba5 call_end_proc + 230
115 libruby.dylib 0x0000000100032eea rb_exec_end_proc + 559
116 libruby.dylib 0x000000010002051c ruby_finalize_0 + 170
117 libruby.dylib 0x00000001000205ab ruby_cleanup + 57
118 libruby.dylib 0x00000001000208c8 ruby_stop + 19
119 libruby.dylib 0x0000000100020937 compile_error + 0
120 ruby 0x0000000100000ebe dyld_stub_exit + 0
121 ruby 0x0000000100000e74 start + 52
Thread 0 crashed with X86 Thread State (64-bit):
rax: 0x0000000000000000 rbx: 0x00007fff5fbd7318 rcx: 0x00007fff5fbd6a68 rdx: 0x0000000000000000
rdi: 0x00000000000013c3 rsi: 0x0000000000000006 rbp: 0x00007fff5fbd6a80 rsp: 0x00007fff5fbd6a68
r8: 0x0000000000000002 r9: 0x0000000000000000 r10: 0x00007fff819bb026 r11: 0x0000000000000202
r12: 0x0000000000000000 r13: 0x0000000000000000 r14: 0x0000000000000000 r15: 0x0000000000000000
rip: 0x00007fff819befe6 rfl: 0x0000000000000202 cr2: 0x00007fff702e71f0
Binary Images:
0x100000000 - 0x100000fff +ruby ??? (???) <C71E7FFC-4129-BB10-8FCE-28CE6753E31E> /usr/local/bin/ruby
0x100003000 - 0x1000fefef +libruby.dylib ??? (???) <A02414BE-9EFE-F690-D8C0-997BC2330549> /usr/local/lib/libruby.dylib
0x1001e1000 - 0x1001e4fff +thread.bundle ??? (???) <CB4AF257-267F-182F-66B6-8A56E01A3843> /usr/local/lib/ruby/1.8/i686-darwin10.0.0/thread.bundle
0x1001e8000 - 0x1001e9ff7 +etc.bundle ??? (???) <356F8541-C0F9-1A34-2C0A-A24035D55960> /usr/local/lib/ruby/1.8/i686-darwin10.0.0/etc.bundle
0x1001ed000 - 0x1001f1ff7 +stringio.bundle ??? (???) <5890BE07-0D66-D7E5-B87B-37A0B06A901D> /usr/local/lib/ruby/1.8/i686-darwin10.0.0/stringio.bundle
0x1001f5000 - 0x1001f9ff7 +strscan.bundle ??? (???) <E6F3DCE7-603E-9472-9C6D-99CD225C494C> /usr/local/lib/ruby/1.8/i686-darwin10.0.0/strscan.bundle
0x1001fd000 - 0x1001fdfff +fcntl.bundle ??? (???) <0F2B8F5B-9F5F-0F82-D1B8-7AB339B5ADA3> /usr/local/lib/ruby/1.8/i686-darwin10.0.0/fcntl.bundle
0x1004b0000 - 0x1004d0fff +syck.bundle ??? (???) <D34A7A9E-C28F-77A5-F95E-5F8A22F19676> /usr/local/lib/ruby/1.8/i686-darwin10.0.0/syck.bundle
0x1004d8000 - 0x1004e5ff7 +bigdecimal.bundle ??? (???) <D9C91EF5-3814-8624-6601-23BF6AD032A3> /usr/local/lib/ruby/1.8/i686-darwin10.0.0/bigdecimal.bundle
0x1004e9000 - 0x1004eaff7 +fast_xs.bundle ??? (???) <7A793C27-7A68-F8E2-DFAB-9F4ABADBBC14> /usr/local/lib/ruby/gems/1.8/gems/hpricot-0.8.2/lib/fast_xs.bundle
0x1004ed000 - 0x1004f5ff7 +zlib.bundle ??? (???) <83CB4E6E-F717-CB1F-D410-BC6F305B4AF4> /usr/local/lib/ruby/1.8/i686-darwin10.0.0/zlib.bundle
0x1004fa000 - 0x1004fafff +md5.bundle ??? (???) <71A83C69-A0CB-3682-18E2-09B644E687D5> /usr/local/lib/ruby/1.8/i686-darwin10.0.0/digest/md5.bundle
0x1004fd000 - 0x1004fdfff +sha1.bundle ??? (???) <049D08F4-BC16-D2E7-04B9-CBB1E89CC01D> /usr/local/lib/ruby/1.8/i686-darwin10.0.0/digest/sha1.bundle
0x10073d000 - 0x10076efff +nkf.bundle ??? (???) <CB4E2B49-D8D7-29B2-9215-67BECCD45AA3> /usr/local/lib/ruby/1.8/i686-darwin10.0.0/nkf.bundle
0x100781000 - 0x10078bfff +socket.bundle ??? (???) <431898C6-794A-BF22-A125-B7D60D554CDA> /usr/local/lib/ruby/1.8/i686-darwin10.0.0/socket.bundle
0x100790000 - 0x100791fff +digest.bundle ??? (???) <955B9322-A593-9926-110F-449CBDA89DF9> /usr/local/lib/ruby/1.8/i686-darwin10.0.0/digest.bundle
0x100795000 - 0x1007a1fff +bluecloth_ext.bundle ??? (???) <875327C8-E817-9F12-0EE4-6A49562C3F8E> /usr/local/lib/ruby/gems/1.8/gems/bluecloth-2.0.5/lib/bluecloth_ext.bundle
0x1007a6000 - 0x1007e2ff7 +openssl.bundle ??? (???) <499510E9-913B-A675-3075-9A0AEC5634B8> /usr/local/lib/ruby/1.8/i686-darwin10.0.0/openssl.bundle
0x10123a000 - 0x1012abfff +redcloth_scan.bundle ??? (???) <96734FEE-7F82-4F10-D8C2-DA1FDC433DAC> /usr/local/lib/ruby/gems/1.8/gems/RedCloth-4.2.2/lib/redcloth_scan.bundle
0x1012af000 - 0x1012b2ff7 +cparse.bundle ??? (???) <EF75611D-1C93-CF58-C128-85D7CF8A061B> /usr/local/lib/ruby/1.8/i686-darwin10.0.0/racc/cparse.bundle
0x1012b5000 - 0x1012b7ff7 +iconv.bundle ??? (???) <BDB48C60-66D8-036F-D6E9-F7669CBDA16C> /usr/local/lib/ruby/1.8/i686-darwin10.0.0/iconv.bundle
0x1012bb000 - 0x1012bffff +parser.bundle ??? (???) <261FDCD0-29C8-8A3B-9B72-D4BC51715B67> /usr/local/lib/ruby/gems/1.8/gems/json-1.1.3/ext/json/ext/parser.bundle
0x1012c3000 - 0x1012c7ff7 +generator.bundle ??? (???) <B354DFF3-AE88-AC13-2D6A-C8827C0033F2> /usr/local/lib/ruby/gems/1.8/gems/json-1.1.3/ext/json/ext/generator.bundle
0x1012cb000 - 0x1012dafff +nokogiri.bundle ??? (???) <81F28AEC-FF97-8911-4728-9253F14205F3> /usr/local/lib/ruby/gems/1.8/gems/nokogiri-1.4.1/lib/nokogiri/nokogiri.bundle
0x1012eb000 - 0x1012f2ff7 +ruby_debug.bundle ??? (???) <2AA2B821-3C45-14A6-9573-38D651556B36> /Users/lbayes/.gem/ruby/1.8/gems/ruby-debug-base-0.10.3/lib/ruby_debug.bundle
0x1012f7000 - 0x1012f9fff +trace_nums.bundle ??? (???) <70D184EC-461F-D2E6-8094-B56FB2BACE83> /Users/lbayes/.gem/ruby/1.8/gems/linecache-0.43/ext/trace_nums.bundle
0x101802000 - 0x101815fe7 +libexslt.0.dylib ??? (???) <FD064ED5-7CC6-E58E-00DD-06775F1BBE72> /usr/local/lib/libexslt.0.dylib
0x10181b000 - 0x10185bff7 +libxslt.1.dylib ??? (???) <8A989A1C-85AE-2CE9-068A-C6DCDF839566> /usr/local/lib/libxslt.1.dylib
0x101867000 - 0x101869ff7 +readline.bundle ??? (???) <79F5B425-0C27-CF59-2EE6-E05AFE3EF850> /usr/local/lib/ruby/1.8/i686-darwin10.0.0/readline.bundle
0x10186d000 - 0x101889ff7 libedit.2.dylib ??? (???) <F9D005F8-74B8-CC05-2697-24C49E0CC1EF> /usr/lib/libedit.2.dylib
0x101898000 - 0x1018a6fff +sqlite3_api.bundle ??? (???) <50ED247E-9C93-8CA1-8E7E-18F715A60DE9> /usr/local/lib/ruby/gems/1.8/gems/sqlite3-ruby-1.2.5/lib/sqlite3_api.bundle
0x103900000 - 0x103a83fe7 +libxml2.2.dylib ??? (???) <0B99B8DC-820C-FCE2-B37E-3D4B6BA67EDE> /usr/local/lib/libxml2.2.dylib
0x7fff5fc00000 - 0x7fff5fc3bdef dyld 132.1 (???) <B633F790-4DDB-53CD-7ACF-2A3682BCEA9F> /usr/lib/dyld
0x7fff808d1000 - 0x7fff808d2ff7 com.apple.TrustEvaluationAgent 1.1 (1) <51867586-1C71-AE37-EAAD-535A58DD3550> /System/Library/PrivateFrameworks/TrustEvaluationAgent.framework/Versions/A/TrustEvaluationAgent
0x7fff81877000 - 0x7fff8196ffe7 libiconv.2.dylib ??? (???) <ECEE3D93-B5E3-F0E0-803E-CA3DC3B33D57> /usr/lib/libiconv.2.dylib
0x7fff81970000 - 0x7fff81b2eff7 libSystem.B.dylib ??? (???) <526DD3E5-2A8B-4512-ED97-01B832369959> /usr/lib/libSystem.B.dylib
0x7fff833f5000 - 0x7fff834aefff libsqlite3.dylib ??? (???) <5A15E12A-AE8F-1A36-BBC7-564E7D7AD0FB> /usr/lib/libsqlite3.dylib
0x7fff85363000 - 0x7fff853e0fef libstdc++.6.dylib ??? (???) <35ECA411-2C08-FD7D-11B1-1B7A04921A5C> /usr/lib/libstdc++.6.dylib
0x7fff853e1000 - 0x7fff853f2fef libz.1.dylib ??? (???) <3A7A4C48-A4C8-A78A-8B87-C0DDF6601AC8> /usr/lib/libz.1.dylib
0x7fff85cf9000 - 0x7fff85d38fef libncurses.5.4.dylib ??? (???) <E0A07C12-D912-DF26-9E38-C50484D96EB0> /usr/lib/libncurses.5.4.dylib
0x7fff86662000 - 0x7fff86783fe7 libcrypto.0.9.8.dylib ??? (???) <32F2A87F-B146-BBF2-3AD1-494C686F1EE3> /usr/lib/libcrypto.0.9.8.dylib
0x7fff87f25000 - 0x7fff87f5ffff libssl.0.9.8.dylib ??? (???) <0714FA32-C193-CD96-80D1-6FCF06A0ED2E> /usr/lib/libssl.0.9.8.dylib
0x7fff886ad000 - 0x7fff886f9fff libauto.dylib ??? (???) <072804DF-36AD-2DBE-7EF8-639CFB79077F> /usr/lib/libauto.dylib
0x7fff88894000 - 0x7fff8894afff libobjc.A.dylib ??? (???) <F206BE6D-8777-AE6C-B367-7BEA76C14241> /usr/lib/libobjc.A.dylib
0x7fff88c99000 - 0x7fff88c9dff7 libmathCommon.A.dylib ??? (???) <95718673-FEEE-B6ED-B127-BCDBDB60D4E5> /usr/lib/system/libmathCommon.A.dylib
0x7fffffe00000 - 0x7fffffe01fff libSystem.B.dylib ??? (???) <526DD3E5-2A8B-4512-ED97-01B832369959> /usr/lib/libSystem.B.dylib
最佳答案
好的，我已经在我的机器上修复了这个问题。我不确定具体原因，但是将 ruby-debug gem 降级到版本 0.10.0 可以解决我的问题。
具体修复是运行以下命令:
sudo gem uninstall ruby-debug
sudo gem install ruby-debug --version 0.10.0
关于ruby-on-rails - 为什么 Ruby 只在我的系统上抛出一个段错误，而且只在这个 Rails 应用程序中？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/2112371/
我正在学习如何使用Nokogiri，根据这段代码我遇到了一些问题:require'rubygems'require'mechanize'post_agent=WWW::Mechanize.newpost_page=post_agent.get('http://www.vbulletin.org/forum/showthread.php?t=230708')puts"\nabsolutepathwithtbodygivesnil"putspost_page.parser.xpath('/html/body/div/div/div/div/div/table/tbody/tr/td/div
总的来说，我对ruby还比较陌生，我正在为我正在创建的对象编写一些rspec测试用例。许多测试用例都非常基础，我只是想确保正确填充和返回值。我想知道是否有办法使用循环结构来执行此操作。不必为我要测试的每个方法都设置一个assertEquals。例如:describeitem,"TestingtheItem"doit"willhaveanullvaluetostart"doitem=Item.new#HereIcoulddotheitem.name.shouldbe_nil#thenIcoulddoitem.category.shouldbe_nilendend但我想要一些方法来使用
我有一个字符串input="maybe(thisis|thatwas)some((nice|ugly)(day|night)|(strange(weather|time)))"Ruby中解析该字符串的最佳方法是什么？我的意思是脚本应该能够像这样构建句子:maybethisissomeuglynightmaybethatwassomenicenightmaybethiswassomestrangetime等等，你明白了......我应该一个字符一个字符地读取字符串并构建一个带有堆栈的状态机来存储括号值以供以后计算，还是有更好的方法？也许为此目的准备了一个开箱即用的库？
我有一个Ruby程序，它使用rubyzip压缩XML文件的目录树。gem。我的问题是文件开始变得很重，我想提高压缩级别，因为压缩时间不是问题。我在rubyzipdocumentation中找不到一种为创建的ZIP文件指定压缩级别的方法。有人知道如何更改此设置吗？是否有另一个允许指定压缩级别的Ruby库？ 最佳答案 这是我通过查看rubyzip内部创建的代码。level=Zlib::BEST_COMPRESSIONZip::ZipOutputStream.open(zip_file)do|zip|Dir.glob("**/*")d
类classAprivatedeffooputs:fooendpublicdefbarputs:barendprivatedefzimputs:zimendprotecteddefdibputs:dibendendA的实例a=A.new测试a.foorescueputs:faila.barrescueputs:faila.zimrescueputs:faila.dibrescueputs:faila.gazrescueputs:fail测试输出failbarfailfailfail.发送测试[:foo,:bar,:zim,:dib,:gaz].each{|m|a.send(m)resc
很好奇，就使用rubyonrails自动化单元测试而言，你们正在做什么？您是否创建了一个脚本来在cron中运行rake作业并将结果邮寄给您？git中的预提交Hook？只是手动调用？我完全理解测试，但想知道在错误发生之前捕获错误的最佳实践是什么。让我们理所当然地认为测试本身是完美无缺的，并且可以正常工作。下一步是什么以确保他们在正确的时间将可能有害的结果传达给您？ 最佳答案 不确定您到底想听什么，但是有几个级别的自动代码库控制:在处理某项功能时，您可以使用类似autotest的内容获得关于哪些有效，哪些无效的即时反馈。要确保您的提
这似乎应该有一个直截了当的答案，但在Google上花了很多时间，所以我找不到它。这可能是缺少正确关键字的情况。在我的RoR应用程序中，我有几个模型共享一种特定类型的字符串属性，该属性具有特殊验证和其他功能。我能想到的最接近的类似示例是表示URL的字符串。这会导致模型中出现大量重复(甚至单元测试中会出现更多重复)，但我不确定如何让它更DRY。我能想到几个可能的方向...按照“validates_url_format_of”插件，但这只会让验证干给这个特殊的字符串它自己的模型，但这看起来很像重溶液为这个特殊的字符串创建一个ruby类，但是我如何得到ActiveRecord关联这个类模型
假设我做了一个模块如下:m=Module.newdoclassCendend三个问题:除了对m的引用之外，还有什么方法可以访问C和m中的其他内容？我可以在创建匿名模块后为其命名吗(就像我输入“module...”一样)？如何在使用完匿名模块后将其删除，使其定义的常量不再存在？ 最佳答案 三个答案:是的，使用ObjectSpace.此代码使c引用你的类(class)C不引用m:c=nilObjectSpace.each_object{|obj|c=objif(Class===objandobj.name=~/::C$/)}当然这取决于
我试图在一个项目中使用rake，如果我把所有东西都放到Rakefile中，它会很大并且很难读取/找到东西，所以我试着将每个命名空间放在lib/rake中它自己的文件中，我添加了这个到我的rake文件的顶部:Dir['#{File.dirname(__FILE__)}/lib/rake/*.rake'].map{|f|requiref}它加载文件没问题，但没有任务。我现在只有一个.rake文件作为测试，名为“servers.rake”，它看起来像这样:namespace:serverdotask:testdoputs"test"endend所以当我运行rakeserver:testid时
出于纯粹的兴趣，我很好奇如何按顺序创建PI，而不是在过程结果之后生成数字，而是让数字在过程本身生成时显示。如果是这种情况，那么数字可以自行产生，我可以对以前看到的数字实现垃圾收集，从而创建一个无限系列。结果只是在Pi系列之后每秒生成一个数字。这是我通过互联网筛选的结果:这是流行的计算机友好算法，类机器算法:defarccot(x,unity)xpow=unity/xn=1sign=1sum=0loopdoterm=xpow/nbreakifterm==0sum+=sign*(xpow/n)xpow/=x*xn+=2sign=-signendsumenddefcalc_pi(digits