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How do I create an immutable Class?
...rayList.ReadOnly or similar - you can combine this with the previous point and store a read-only copy to be returned when callers access it), return an enumerator, or use some other method/property that allows read-only access into the collection
keep in mind that you still may have the appearance o...
'IF' in 'SELECT' statement - choose output value based on column values
I need amount to be amount if report.type='P' and -amount if report.type='N' . How do I add this to the above query?
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error: ‘NULL’ was not declared in this scope
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NULL is not a keyword. It's an identifier defined in some standard headers. You can include
#include <cstddef>
To have it in scope, including some other basics, like std::size_t.
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Flask-SQLAlchemy import/context issue
...y
db = SQLAlchemy()
class Member(db.Model):
# fields here
pass
And then in your application setup you can call init_app:
# apps.application.py
from flask import Flask
from apps.members.models import db
app = Flask(__name__)
# later on
db.init_app(app)
This way you can avoid cyclical ...
Is there any way to check if iOS app is in background?
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Thank you — and for additional clarity it's [[UIApplication sharedApplication] applicationState] == UIApplicationStateBackground.
– podperson
Jun 5 '12 at 16:01
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Can you give a Django app a verbose name for use throughout the admin?
In the same way that you can give fields and models verbose names that appear in the Django admin, can you give an app a custom name?
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Get all attributes of an element using jQuery
I am trying to go through an element and get all the attributes of that element to output them, for example an tag may have 3 or more attributes, unknown to me and I need to get the names and values of these attributes. I was thinking something along the lines of:
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How to filter by object property in angularJS
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I'm not sure to understand. If you want to choose the polarity to filter, you can pass a scope variable instead of a plain text : filter:{polarity:polarityToFilter} where $scope.polarityToFilter is filled by a click on one of the three buttons. Is ...
find() with nil when there are no records
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Yes, just do:
Challenge.find_by_id(10)
For Rails 4 and 5:
Challenge.find_by(id: 10)
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Open Source Java Profilers [closed]
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The VisualVM profiler is a stand-alone version of the one in NetBeans. It is a VERY good start.
– Thorbjørn Ravn Andersen
Jun 4 '09 at 6:06
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