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validation custom message for rails 3
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A custom message for a boolean with conditionals might be:
validates :foo, inclusion: { in: [true, false], message: "cannot be blank" }, if: :bar?
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Can you remove elements from a std::list while iterating through it?
...ions. That is simply how function work. And it has nothing to do with your foo.b(i++).c(i++) example (which is undefined in any case)
– jalf
Feb 28 '09 at 15:59
77
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Can I squash commits in Mercurial?
... Seems the most natural way for git people ;)
– foo
Dec 9 '17 at 6:37
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Which HTTP methods match up to which CRUD methods?
...ly not the only way to do it; if the client knows that it wants to create /foo/abc and knows what content to put there, it works just fine as a PUT.
The canonical description of a POST is when you're committing to purchasing something: that's an action which nobody wants to repeat without knowing i...
What is the pythonic way to avoid default parameters that are empty lists?
... future calls to the function as well"
Sample code to implement it:
def foo(element, to=None):
if to is None:
to = []
to.append(element)
return to
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Is there auto type inferring in Java?
...imilar to auto keyword in C++
List<String> strList = Arrays.asList("foo", "bar", "baz");
for (val s: strList){
System.out.println(s.length());
}
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Python time measure function
... func.__name__, int(elapsedTime * 1000)))
return newfunc
@timeit
def foobar():
mike = Person()
mike.think(30)
The context manager method
from contextlib import contextmanager
@contextmanager
def timeit_context(name):
startTime = time.time()
yield
elapsedTime = time.time...
Python argparse: default value or specified value
...e default and since I need to do some ops, I have something like this self.foo = (args.bar or some_else_source).upper(). It will break on None object AFAIUC.
– 0andriy
Aug 12 '19 at 14:02
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Best way to create custom config options for my Rails app?
...ocument describes config_for method as:
Convenience for loading config/foo.yml for the current Rails env.
If you do not want to use a yaml file
As Rails official guide says:
You can configure your own code through the Rails configuration object with custom configuration under the config...
Java Immutable Collections
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Collection<String> c1 = new ArrayList<String>();
c1.add("foo");
Collection<String> c2 = Collections.unmodifiableList(c1);
c1 is mutable (i.e. neither unmodifiable nor immutable).
c2 is unmodifiable: it can't be changed itself, but if later on I change c1 then that change wi...