大约有 40,000 项符合查询结果（耗时：0.0538秒） [XML]
find() with nil when there are no records
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Yes, just do:
Challenge.find_by_id(10)
For Rails 4 and 5:
Challenge.find_by(id: 10)
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Using Pairs or 2-tuples in Java [duplicate]
...to design this class further regarding equality, immutability, etc., especially if you plan to use instances as keys for hashing.
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Java equivalent to #region in C#
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Actually this can be achieved. If you scroll down on this post "Yaqub Ahmad" explains how to get this functionality. Also here is a link (kosiara87.blogspot.com/2011/12/…) that shows you how to add it to your existing eclipse e...
Interfacing with structs and anonymous unions with c2hs
...You would have to do this patch for each version of the lib.
struct monome_event {
monome_t *monome;
monome_event_type_t event_type;
/* __extension__ for anonymous unions in gcc */
__extension__ union {
struct me_grid {
unsigned int x;
unsigned int y...
NSString: isEqual vs. isEqualToString
...arrays contain an equal number of objects, and that the objects at a given index return YES for the isEqual: test.
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Filter rows which contain a certain string
...n easily extend to more than one column.
Below also a solution with filter_all in order to find the string in any column,
using diamonds as example, looking for the string "V"
library(tidyverse)
String in only one column
# for only one column... extendable to more than one creating a column list in...
Why do we need message brokers like RabbitMQ over a database like PostgreSQL?
...ustering options are also available.
In regards to AMQP, I would say a really cool feature is the "exchange", and the ability for it to route to other exchanges. This gives you more flexibility and enables you to create a wide array of elaborate routing typologies which can come in very handy when...
How to programmatically determine the current checked out Git branch [duplicate]
...ions/git-completion.bash does that for bash prompt in __git_ps1. Removing all extras like selecting how to describe detached HEAD situation, i.e. when we are on unnamed branch, it is:
branch_name="$(git symbolic-ref HEAD 2>/dev/null)" ||
branch_name="(unnamed branch)" # detached HEAD
branc...
How to elegantly deal with timezones
...t is that inside the DB, date/times are stored in UTC. When on the server, all date/times should be dealt with in UTC. However, I see three problems that I'm trying to overcome:
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How add context menu item to Windows Explorer for folders [closed]
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HKEY_CURRENT_USER\Software\Classes\*\shell if you are a normal user
In all cases:
add a new key under shell, naming it as you want to name the
context menu item
add a new key inside this key, named command (mandatory name)
edit the default property in command to
myprogrampath\path\path\executa...