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@UniqueConstraint annotation in Java
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@Entity
@Table(uniqueConstraints={@UniqueConstraint(columnNames = {"id_1" , "id_2"})})
public class class_name {
@Id
@GeneratedValue
public Long id;
@NotNull
public Long id_1;
@NotNull
public Long id_2;
}
Hope it helped.
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What is the purpose of double curly braces in React's JSX syntax?
... an object literal inlined in the prop value. It's the same as
var obj = {__html: rawMarkup};
<span dangerouslySetInnerHTML={obj} />
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What is the use of having destructor as private?
...e connection being open or a file being written. You could have a "request_delete" method in the class or the manager that will check that condition and it will either delete or decline, and return a status telling you what it did. That's far more flexible that just calling "delete".
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How to convert a Django QuerySet to a list
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You could do this:
import itertools
ids = set(existing_answer.answer.id for existing_answer in existing_question_answers)
answers = itertools.ifilter(lambda x: x.id not in ids, answers)
Read when QuerySets are evaluated and note that it is not good to load the whole result int...
What does the Q_OBJECT macro do? Why do all Qt objects need this macro?
...ing Qt and noticed that all the example class definitions have the macro Q_OBJECT as the first line. What is the purpose of this preprocessor macro?
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Easy pretty printing of floats in python?
...most exactly) this command you said you made up:
import numpy as np
np.set_printoptions(precision=2)
Or even better in your case if you still want to see all decimals of really precise numbers, but get rid of trailing zeros for example, use the formatting string %g:
np.set_printoptions(formatter...
How does type Dynamic work and how to use it?
...rized:
class DynImpl extends Dynamic {
import reflect.runtime.universe._
def applyDynamic[A : TypeTag](name: String)(args: A*): A = name match {
case "sum" if typeOf[A] =:= typeOf[Int] =>
args.asInstanceOf[Seq[Int]].sum.asInstanceOf[A]
case "concat" if typeOf[A] =:= typeOf[St...
How to get a cross-origin resource sharing (CORS) post request working
...E:
response = HttpResponse(json.dumps('{"status" : "success"}'))
response.__setitem__("Content-type", "application/json")
response.__setitem__("Access-Control-Allow-Origin", "*")
return response
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Representing Directory & File Structure in Markdown Syntax [closed]
...se ASCII to build the structures, so your example structure becomes
.
+-- _config.yml
+-- _drafts
| +-- begin-with-the-crazy-ideas.textile
| +-- on-simplicity-in-technology.markdown
+-- _includes
| +-- footer.html
| +-- header.html
+-- _layouts
| +-- default.html
| +-- post.html
+-- _po...
Java: Date from unix timestamp
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This is the right way:
Date date = new Date ();
date.setTime((long)unix_time*1000);
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