大约有 1,824 项符合查询结果（耗时：0.0296秒） [XML]
How do I migrate a model out of one django app and into a new one?
...mon
| |-- migrations
| | |-- 0001_initial.py
| | `-- 0002_create_cat.py
| `-- models.py
`-- specific
|-- migrations
| |-- 0001_initial.py
| `-- 0002_create_dog.py
`-- models.py
Now we want to move model common.models.cat to specific app (precisely to specific.models...
Throwing cats out of windows
Imagine you're in a tall building with a cat. The cat can survive a fall out of a low story window, but will die if thrown from a high floor. How can you figure out the longest drop that the cat can survive, using the least number of attempts?
...
How do I create an abstract base class in JavaScript?
...error:
new Animal(); // throws
This is how you "inherit" from it:
var Cat = function() {
Animal.apply(this, arguments);
// Cat initialization...
};
Cat.prototype = Object.create(Animal.prototype);
Cat.prototype.constructor = Cat;
Cat.prototype.say = function() {
console.log('meow')...
How to avoid type safety warnings with Hibernate HQL results?
...elper
Simply refactor all your @SuppressWarnings into one place:
List<Cat> cats = MyHibernateUtils.listAndCast(q);
...
public static <T> List<T> listAndCast(Query q) {
@SuppressWarnings("unchecked")
List list = q.list();
return list;
}
Prevent Eclipse from generat...
Useless use of cat?
...en some rookie tried to pin the UUOC on me for one of my answers. It was a cat file.txt | grep foo | cut ... | cut .... I gave him a piece of my mind, and only after doing so visited the link he gave me referring to the origins of the award and the practice of doing so. Further searching led me to t...
postgresql - replace all instances of a string within text field
...stance :
UPDATE <table> SET <field> = replace(<field>, 'cat', 'dog')
Be aware, though, that this will be a string-to-string replacement, so 'category' will become 'dogegory'. the regexp_replace function may help you define a stricter match pattern for what you want to replace.
...
How to replace all occurrences of a string?
... String.replaceAll() method defined by the ECMAScript 2021 language specification. For older/legacy browser support, the below still applies.
str = str.replace(/abc/g, '');
In response to comment:
var find = 'abc';
var re = new RegExp(find, 'g');
str = str.replace(re, '');
In response to Click U...
Numbering rows within groups in a data frame
...
Use ave, ddply, dplyr or data.table:
df$num <- ave(df$val, df$cat, FUN = seq_along)
or:
library(plyr)
ddply(df, .(cat), mutate, id = seq_along(val))
or:
library(dplyr)
df %>% group_by(cat) %>% mutate(id = row_number())
or (the most memory efficient, as it assigns by refere...
How do I test an AngularJS service with Jasmine?
... of the service or factory. Angular uses this injector itself in your applications, too, to tell the application what is available.
However, it can be called in more than one place, and it can also be called implicitly instead of explicitly. You'll notice in my example spec test file below, the befo...
How to pipe list of files returned by find command to cat to view all the files
...nd then getting a list of files. How do I pipe it to another utility like cat (so that cat displays the contents of all those files) and basically need to grep something from these files.
...