... an Arel example of a case-insensitive search: Product.where(Product.arel_table[:name].matches('Blue Jeans')) The advantage of this type of solution is that it is database-agnostic - it will use the correct SQL commands for your current adapter (matches will use ILIKE for Postgres, and LIKE for e...

...you wish to coordinate for a specific version. On the other hand, in the table in Appendix A it is stated that the screenshots are Locked, Version-level (page 153). Version-level is: If the item is marked on the Version, then the item information will relate to a specific version and may vary...

...可能会报目录不存在的错误，无视 [root@redhat ~]#yum clean all [root@redhat ~]#yum makecache 检查一下成功没有 [root@redhat mnt]# yum grouplist 6、安装支持包 [root@redhat yum.repos.d]# cd /mnt/ [root@redhat mnt]# cat pacakage.txt [root@redhat mnt]# yum install $(...

...rms using leading or trailing underscores are recognized (these can generally be combined with any case convention): _single_leading_underscore: weak "internal use" indicator. E.g. from M import * does not import objects whose name starts with an underscore. single_trailing_underscore_: ...

Simple example: I want to have some items on a page (like divs or table rows), and I want to let the user click on them to select them. That seems easy enough in jQuery. To save which items a user clicks on with no server-side post backs, I was thinking a cookie would be a simple way to get this don...

... Be extremely careful using any of the other suggestions. It all depends on context. I have spent a long time tracing a bugs in a system that presumed a==b if |a-b|<epsilon. The underlying problems were: The implicit presumption in an algorithm that if a==b and b==c then a==c. ...

...ned can store negative numbers (i.e., may have a negative sign). Here's a table of the ranges of values each INTEGER type can store: Source: http://dev.mysql.com/doc/refman/5.6/en/integer-types.html UNSIGNED ranges from 0 to n, while signed ranges from about -n/2 to n/2. In this case, you have ...

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... data.table seems to be even faster than pre-allocation using data.frames. Testing here: stackoverflow.com/a/11486400/636656 – Ari B. Friedman Jul 15 '12 at 2:02 ...

...ject'>) with A forced to come in resolution order only once and after all of its subclasses, so that overrides (i.e., C's override of member x) actually work sensibly. It's one of the reasons that old-style classes should be avoided: multiple inheritance with "diamond-like" patterns just doesn...