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How to limit the maximum value of a numeric field in a Django model?
..., make sure to call the model full_clean method before saving the model in order to trigger the validators. This is not required when using ModelForm since the forms will do that automatically.
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How to export a Vagrant virtual machine to transfer it
...n the box is used. For more information,
read about the Vagrantfile load order.
https://www.vagrantup.com/docs/cli/package.html
When finnished, you will have a package.box file.
3- Copy all these files (/config, /database, Vagrantfile, package.box, etc.) and paste them on your Computer 2 just ...
SQLAlchemy: cascade delete
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I had to set passive_deletes='all' in order to get the children to be deleted by the database cascade when the parent is deleted. With passive_deletes=True, children objects were getting disassociated (parent set to NULL) before the parent is deleted, so the data...
How to customize an end time for a YouTube video?
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java SSL and cert keystore
...n searches for
and uses a keystore file in the
following locations (in order):
$JAVA_HOME/lib/security/jssecacerts
$JAVA_HOME/lib/security/cacerts
javax.net.ssl.trustStorePassword -
Password to unlock the keystore file
(store password) specified by
javax.net.ssl.trustSt...
Concatenate two string literals
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In case 1, because of order of operations you get:
(hello + ", world") + "!" which resolves to hello + "!" and finally to hello
In case 2, as James noted, you get:
("Hello" + ", world") + exclam which is the concat of 2 string literals.
Hope i...
C# Iterate through Class properties
...he values. You would have to try this out and make sure you understand the order of the properties though. Refer to this MSDN Documentation for more information on this approach.
For a hint, you could possibly do something like:
Record record = new Record();
PropertyInfo[] properties = typeof(Rec...
How can I set the Sender's address in Jenkins?
...nd Jenkins 1.565.1, installed from the external repo, I had to set this in order to make mail delivery work.
– Max Hohenegger
Aug 21 '14 at 8:39
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What is the difference between “expose” and “publish” in Docker?
...ork interface. When a port is published, it is mapped to an available high-order port (higher than 30000) on the host machine, unless you specify the port to map to on the host machine at runtime. You cannot specify the port to map to on the host machine when you build the image (in the Dockerfile),...
How to set the current working directory? [duplicate]
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