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When to use a “has_many :through” relation in Rails?
I am trying to understand what has_many :through is and when to use it (and how). However, I am not getting it. I am reading Beginning Rails 3 and I tried Googling, but I am not able to understand.
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Is it possible to read the value of a annotation in java?
...annotation has the runtime retention
@Retention(RetentionPolicy.RUNTIME)
@interface Column {
....
}
you can do something like this
for (Field f: MyClass.class.getFields()) {
Column column = f.getAnnotation(Column.class);
if (column != null)
System.out.println(column.columnName()...
How to get notified about changes of the history via history.pushState?
So now that HTML5 introduces history.pushState to change the browsers history, websites start using this in combination with Ajax instead of changing the fragment identifier of the URL.
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How to specify jackson to only use fields - preferably globally
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You can configure individual ObjectMappers like this:
ObjectMapper mapper = new ObjectMapper();
mapper.setVisibility(mapper.getSerializationConfig().getDefaultVisibilityChecker()
.withFieldVisibility(JsonAutoDetect.Visibility...
Difference between std::result_of and decltype
I have some trouble understanding the need for std::result_of in C++0x. If I understood correctly, result_of is used to obtain the resulting type of invoking a function object with certain types of parameters. For example:
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TypeScript with KnockoutJS
Is there any sample of using TypeScript with KnockoutJS? I'm just curious as to how they would work together?
6 Answers
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What is the difference between Hibernate and Spring Data JPA
What are the main differences between Hibernate and Spring Data JPA? When should we not use Hibernate or Spring Data JPA? Also, when may Spring JDBC template perform better than Hibernate / Spring Data JPA?
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Firing events on CSS class changes in jQuery
How can I fire an event if a CSS class is added or changed using jQuery?
Does changing of a CSS class fire the jQuery change() event?
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What should be in my .gitignore for an Android Studio project?
What files should be in my .gitignore for an Android Studio project?
31 Answers
31
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Notification click: activity already open
I have an application with notifications that open a certain activity if I click them. I want that, if I click the notification and the activity is already opened, it's not started again, but just brought to front.
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