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Run a callback only if an attribute has changed in Rails
...eRecord::Base
before_save :do_something, if: :will_save_change_to_status_id?
private
def do_something
# ...
end
end
The commit that changed ActiveRecord::Dirty is here: https://github.com/rails/rails/commit/16ae3db5a5c6a08383b974ae6c96faac5b4a3c81
Here is a blog post on these change...
How to pass values between Fragments
...dle);
and to receive in fragment in Fragment onCreateView method:
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
String strtext=getArguments().getString("message");
return inflater.inflate(R.layout.fragment, con...
Open-sided Android stroke?
Is it possible to create an Android shape object with stroke on only certain sides?
8 Answers
...
Specifying an Index (Non-Unique Key) Using JPA
... indexes = {@Index(name = "i_company_activity", columnList = "activity_id,company_id")})
public class CompanyActivity{
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How to change color of Android ListView separator line?
...
You can set this value in a layout xml file using android:divider="#FF0000". If you are changing the colour/drawable, you have to set/reset the height of the divider too.
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="wrap_c...
Problems with contenttypes when loading a fixture in Django
... keys". For example:
Permission.codename is used in favour of Permission.id
User.username is used in favour of User.id
Read more: natural keys section in "serializing django objects"
Some other useful arguments for dumpdata:
--indent=4 make it human readable.
-e sessions exclude session data
...
How can I return an empty IEnumerable?
...n the following code and the suggestions given in this question , I've decided to modify this original method and ask if there are any values in the IEnumarable return it, if not return an IEnumerable with no values.
...
How to specify an area name in an action link?
...ameter is to pass route Values, if you pass an empty parameter it will consider root structure and if you pass appropriate value it use it as area.
Also do not forget to use null or new{} as the 5th parameter because passing null or new {} while creating action link will not overload method for (te...
How to use the toString method in Java?
... easy for a person to read. It is
recommended that all subclasses
override this method.
The toString method for class Object
returns a string consisting of the
name of the class of which the object
is an instance, the at-sign character
`@', and the unsigned hexadecimal
representa...
How to configure multi-module Maven + Sonar + JaCoCo to give merged coverage report?
...r docs refer to a GitHub project with examples that are helpful. What I did to solve this was to apply the integration tests logic to regular unit tests (although proper unit tests should be submodule specific, this isn't always the case).
In the parent pom.xml, add these properties:
<propert...