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Equivalent of .try() for a hash to avoid “undefined method” errors on nil? [duplicate]
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You forgot to put a . before the try:
@myvar = session[:comments].try(:[], @comment.id)
since [] is the name of the method when you do [@comment.id].
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Select datatype of the field in postgres
How do I get datatype of specific field from table in postgres ?
For example
I have the following table,
student_details (
stu_id integer,
stu_name varchar(30 ),
joined_date timestamp
);
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How does autowiring work in Spring?
...ould enable the <context:component-scan> so that classes are scanned for the @Controller, @Service, etc. annotations.
The entry point for a Spring-MVC application is the DispatcherServlet, but it is hidden from you, and hence the direct interaction and bootstrapping of the application context ...
How to delete object from array inside foreach loop?
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foreach($array as $elementKey => $element) {
foreach($element as $valueKey => $value) {
if($valueKey == 'id' && $value == 'searched_value'){
//delete this particular object from the $arra...
Best way of invoking getter by reflection
...k this should point you towards the right direction:
import java.beans.*
for (PropertyDescriptor pd : Introspector.getBeanInfo(Foo.class).getPropertyDescriptors()) {
if (pd.getReadMethod() != null && !"class".equals(pd.getName()))
System.out.println(pd.getReadMethod().invoke(foo));
}...
Using querySelectorAll to retrieve direct children
...n [pre-Chrominum] versions of Edge or IE, but has been supported by Safari for a few years already. Using that, your code could become:
let myDiv = getElementById("myDiv");
myDiv.querySelectorAll(":scope > .foo");
Note that in some cases you can also skip .querySelectorAll and use other good ...
How to fetch FetchType.LAZY associations with JPA and Hibernate in a Spring Controller
...y collection in order to initialize it (common practice is to call .size() for this purpose). In Hibernate there is a dedicated method for this (Hibernate.initialize()), but JPA has no equivalent of that. Of course you will have to make sure that the invocation is done, when the session is still ava...
What are the typical reasons Javascript developed on Firefox fails on IE? [closed]
... only applies to IE8 and below and to a certain extent IE9 in quirks mode. For example, IE9 supports SVG, <canvas>, <audio> and <video> natively, however you must enable standards compliance mode for them to be available.
General:
Problems with partially loaded documents: It...
IBOutlet and IBAction
...ur code, but if you are going to use it, then you need to specify IBAction for methods that will be used in IB and IBOutlet for objects that will be used in IB.
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How do I use ROW_NUMBER()?
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For the first question, why not just use?
SELECT COUNT(*) FROM myTable
to get the count.
And for the second question, the primary key of the row is what should be used to identify a particular row. Don't try and use the...