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Underscore.
>>> 5+5
10
>>> _
10
>>> _ + 5
15
>>> _
15
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Rails: Check output of path helper from console
...le, you can call app.post_path. This will work in Rails ~= 2.3 and >= 3.1.0.
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Select records from NOW() -1 Day
... in a MySQL statement to order records (through a date stamp) by >= NOW() -1 so all records from the day before today to the future are selected?
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How to add multiple objects to ManyToMany relationship at once in Django ?
...dd() accepts an arbitrary number of arguments, not a list of them.
add(obj1, obj2, obj3, ...)
To expand that list into arguments, use *
add(*[obj1, obj2, obj3])
Addendum:
Django does not call obj.save() for each item but uses bulk_create(), instead.
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Subscripts in plots in R
...w to write subscripts in the title or the subtitle in R.
How can I write v 1,2 with 1,2 as subscripts?
6 Answers
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rails 3 validation on uniqueness on multiple attributes
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edited Aug 15 '14 at 14:15
Jason Swett
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Replacement for “rename” in dplyr
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148
dplyr version 0.3 added a new rename() function that works just like plyr::rename().
df <-...
Uninstall old versions of Ruby gems
...# choose which ones you want to remove
gem uninstall rjb
# remove version 1.1.9 only
gem uninstall rjb --version 1.1.9
# remove all versions less than 1.3.4
gem uninstall rjb --version '<1.3.4'
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npm install vs. update - what's the difference?
...d in package.json:
{
"name": "my-project",
"version": "1.0", // install update
"dependencies": { // ------------------
"already-installed-versionless-module": "*", // ignores "1.0" -> "1.1"
"alrea...
廉价共享存储解决方案1-drbd+ha+nfs - 更多技术 - 清泛网 - 专注C/C++及内核技术
廉价共享存储解决方案1-drbd+ha+nfs在没有共享存储的情况下解决非结构化数据高可靠性存储的问题1、问题产生背景三台TOMCAT 服务器通过负载均衡设备对外提供WEB服务。怎么保证...在没有共享存储的情况下解决非结构化数据高可靠...