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Rails hidden field undefined method 'merge' error
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You are using a hidden_field instead of a hidden_field_tag. Because you are using the non-_tag version, it is assumed that your controller has already set the value for that attribute on the object that backs the form. For example:
controller:
def new
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@order.service = "test"
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Difference between 'self' and 'total' in Chrome CPU Profile of JS
...total is how much time was spent in that function, and in the functions it called.
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Xcode variables
In Xcode, I know that you can get variables such as PROJECT_DIR to use in some situations, such as a run script build phase. I am wondering if it's possible to get the build type (i.e., Release or Debug ). Any ideas?
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JNI converting jstring to char *
...vase/1.5.0/docs/guide/jni/spec/functions.html
concerning your problem you can use this
JNIEXPORT void JNICALL Java_ClassName_MethodName(JNIEnv *env, jobject obj, jstring javaString)
{
const char *nativeString = env->GetStringUTFChars(javaString, 0);
// use your string
env->Rel...
Initialize a long in Java
... add L: long i = 12345678910L;.
Yes.
BTW: it doesn't have to be an upper case L, but lower case is confused with 1 many times :).
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How can I get pg_dump to authenticate properly
...GPASSWORD and .pgpass and neither of these two will allow me to authenticate to the database. I have chmod 'd .pgpass to appropriate permissions and also tried:
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CSS: transition opacity on mouse-out?
...ant the transition to affect the mouse-over event, but only mouse-out, you can turn transitions off for the :hover state :
.item:hover {
-webkit-transition: none;
-moz-transition: none;
-ms-transition: none;
-o-transition: none;
transition: none;
zoom: 1;
filter: alpha(opacity=50);
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CSS selector with period in ID
... writing the question, I read through it some more and found there is an escape character. I've never needed it before, but the CSS spec does allow for backslash (\) escaping like most languages. What do you know?
So in my example, the following rule would match:
#some\.id { color: #f00; }
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Meaning of …interface{} (dot dot dot interface)
Below is a piece of Go code I have question about.
Specifically, what is a in this function?
2 Answers
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What does “Protocol … can only be used as a generic constraint because it has Self or associated typ
...: Self) -> Bool
And a protocol that contains Self somewhere inside it cannot be used anywhere except in a type constraint.
Here is a similar question.
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