blocks|key|78850|text|根据我所看到的，我猜您已经手动更改了类名。在错误中，您有类名CreateCodesnippetsTable，但在您提供的迁移文件(pastebin)中，类名是CreateCodeSnippetsTable+(请注意代码片段中的S，我猜这是您手动更改的)。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|78851|如果您检查数据库中的迁移表，您将看到每次迁移的记录。当您创建迁移时，它将以该名称保存在数据库中，并且rollback方法尝试使用数据库中提供的名称读取文件，如果您手动更改该文件，则laravel无法找到类，您将收到错误消息。|78852|要解决此问题，您可以撤消更改并尝试回滚或手动编辑数据库中的迁移行，以包含正确的类名。|78853|希望这能有所帮助。|78854|entityMap^0|U|N|27|N|0|0|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@$9|O|A|P|B|C]|$9|Q|A|R|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|S|8|@]|D|@]|E|$]]|$1|H|3|I|5|6|7|T|8|@]|D|@]|E|$]]|$1|J|3|K|5|6|7|U|8|@]|D|@]|E|$]]|$1|L|3|-4|5|6|7|V|8|@]|D|@]|E|$]]]|M|$]]

From what I can see I am guessing you have changed the class name manually.
In the error you have the class name <code>CreateCodesnippetsTable</code> but in the migration file you provided (pastebin), the class name is <code>CreateCodeSnippetsTable</code> (notice the S in Snippets, I guess that is what you changed manually). 

If you check the migrations table in your database you will see records for each migration. When you create the migration it will be saved in the database with that name and the rollback method tries to read the file with the name provided in the database, in the case when you change it manually laravel can't find the class and you get the error.

To fix this you can undo the changes and try to rollback or manually edit the migration row in your database to include the correct class name.

Hope this helps.

blocks|key|295972|text|也许你已经解决了这个问题。但我注意到，由于某些原因，回滚通常需要您首先运行composer+dumpautoload。即使您的迁移工作正常。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|295973|entityMap^0|11|L|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|K|8|@]|D|@]|E|$]]]|G|$]]

Maybe you've already solved this issue. But I'm noticing that for some reason a rollback often requires you to run <code>composer dumpautoload</code> first. Even if your migration works.

blocks|key|295985|text|我通过运行以下命令修复了它|type|unstyled|depth|inlineStyleRanges|entityRanges|data|295986|composer.phar+update|offset|length|style|CODE|295987|entityMap^0|0|0|K|0^^$0|@$1|2|3|4|5|6|7|J|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|K|8|@$D|L|E|M|F|G]]|9|@]|A|$]]|$1|H|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|I|$]]

I fixed it by running

<code>composer.phar update</code>

blocks|key|78934|text|我面对着同样的问题并解决了这个问题。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|78935|我已经创建了一个迁移，用于在PatientReasonOfVisits表中添加新的列date。在创建迁移时，我使用了最新的生成器，类名是|78936|class+AddDateToPatientReasonOfVisitsTable|code-block|syntax|javascript|78937|当然，在创建新的迁移文件后，您需要运行composer+dump-autoload以确保该文件列在类映射文件中|78938|文件名为2014_09_02_214134_add_date_to_patientreasonofvisitstable.php|78939|迁移成功，并在迁移表中添加了一条新记录。在迁移列中使用文件名|78940|当我回滚迁移时，我得到了类找不到异常，什么类没有找到这个异常|78941|AddDateToPatientreasonofvisitsTable|78942|注意:类名之间的区别|78943|为什么以及如何解决这个问题?我猜当您回滚使用迁移文件名解析的类名时，迁移文件名中的大写和小写字母由文件名中的下划线"_“决定|78944|因此，在将迁移文件重命名为2014_09_02_214134_add_date_to_patient_reason_of_visits_table.php并确保在重命名文件后运行composer+dump-autoload之后，类名被正确解析，没有任何异常|78945|entityMap^0|0|0|0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|10|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|11|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|12|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|13|8|@]|9|@]|A|$]]|$1|K|3|L|5|6|7|14|8|@]|9|@]|A|$]]|$1|M|3|N|5|6|7|15|8|@]|9|@]|A|$]]|$1|O|3|P|5|6|7|16|8|@]|9|@]|A|$]]|$1|Q|3|R|5|F|7|17|8|@]|9|@]|A|$G|H]]|$1|S|3|T|5|6|7|18|8|@]|9|@]|A|$]]|$1|U|3|V|5|6|7|19|8|@]|9|@]|A|$]]|$1|W|3|X|5|6|7|1A|8|@]|9|@]|A|$]]|$1|Y|3|-4|5|6|7|1B|8|@]|9|@]|A|$]]]|Z|$]]

i faced the same problem and figure out the problem 

I've created a migration for adding new column date in PatientReasonOfVisits table 
i used laravel generators 
when i create the migration the class name was 

<pre><code>class AddDateToPatientReasonOfVisitsTable
</code></pre>

sure after creating a new migration file u need to run composer dump-autoload to ensure the file is listed in class map file 

the file name was
2014_09_02_214134_add_date_to_patientreasonofvisitstable.php

the migration done successfully
and a new record has been added into migration table.
in migration column the file name is used 

when i rollback the migration 
i got the class not found exception what class is not found 
this one 

<pre><code>AddDateToPatientreasonofvisitsTable
</code></pre>

note : the difference between classes names

why and how i solved this problem 
i guess when u rollback the class name resolved using the migration file name which in migration table 
the capital and small letters is decided by underscores "_" in file name 

so after renaming the migration file to 
2014_09_02_214134_add_date_to_patient_reason_of_visits_table.php
and sure run composer dump-autoload after renaming the file 
the class name resolved correctly with no exception

blocks|key|296128|text|在我看来，这个错误没有单一的解决方案。我尝试了许多建议，但最终这个建议在我这一端起作用了。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|296129|COMPOSER=composer.json+composer+dump-autoload|code-block|syntax|javascript|296130|​|296131|📷|atomic|offset|length|296132|296133|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/f774d65ad5d92b12264bba1cbb72b7c0.png|imageAlt^0|0|0|0|0|1|0|0|0^^$0|@$1|2|3|4|5|6|7|X|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|Y|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Z|8|@]|9|@]|A|$]]|$1|I|3|J|5|K|7|10|8|@]|9|@$L|11|M|12|1|13]]|A|$]]|$1|N|3|H|5|6|7|14|8|@]|9|@]|A|$]]|$1|O|3|-4|5|6|7|15|8|@]|9|@]|A|$]]]|P|$Q|$5|R|S|T|A|$U|V|W|-4]]]]

It seems to me there are no single solution of this error. I have tried many suggestion but at last this one works in my end.

<pre><code>COMPOSER=composer.json composer dump-autoload
</code></pre>

<img src="https://i.stack.imgur.com/yf4nO.png" alt="enter image description here">

blocks|key|79043|text|我只是删除了迁移表，然后运行php+artisan+migrate:refresh|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|79044|然后迁移都可以执行，不确定这是否是最好的方法，但它对我来说是有效的。|79045|我正在运行Laravel+5。|79046|entityMap^0|E|R|0|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@$9|M|A|N|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|O|8|@]|D|@]|E|$]]|$1|H|3|I|5|6|7|P|8|@]|D|@]|E|$]]|$1|J|3|-4|5|6|7|Q|8|@]|D|@]|E|$]]]|K|$]]

I simply dropped the migrations table then ran <code>php artisan migrate:refresh</code>

Then the migrations were all able to execute, not sure if that's the best method, but it worked for me. 

I'm running Laravel 5.

I can easily run the artisan migrate etc, but when i try to roll it back, with migration:rollback i keep getting this error,

<pre><code>c:\xampp\htdocs\laravel&gt;php artisan migrate:rollback
{"error":{"type":"Symfony\\Component\\Debug\\Exception\\FatalErrorException","message":"Class 'CreateCodesnippetsTable' not found","file":"C:\\xampp\\htdocs\\laravel\\vendor\\laravel\\framework\\src\\Illum
inate\\Database\\Migrations\\Migrator.php","line":301}}
</code></pre>

Is this a bug? or how should i debug this?

Laravel 4 migrate rollback problems

数据库

我可以很容易地运行artisan migrate等，但当我尝试回滚它时，随着迁移:回滚，我一直收到这个错误，c:\xampp\htdocs\laravel>php artisan migrate:rollback{"error":{"type":"Symfony\\Component\\Debug\\Exception...

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