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How do I create an empty array in YAML?
Is there any way to specify that empty_array: is an array with no elements, such as with [] ? When I load it into a ruby hash I'd like it to know that it's an array.
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JavaScript Nested function
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Functions are another type of variable in JavaScript (with some nuances of course). Creating a function within another function changes the scope of the function in the same way it would change the scope of a variable. This is especially important for use with closures to reduce total ...
Set multiple properties in a List ForEach()?
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All you need to do is introduce some brackets so that your anonymous method can support multiple lines:
list.ForEach(i => { i.a = "hello!"; i.b = 99; });
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Matplotlib - Move X-Axis label downwards, but not X-Axis Ticks
I'm using Matplotlib to plot a histogram.
Using tips from my previous question: Matplotlib - label each bin ,
I've more or less go the kinks worked out.
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Knockout.js bound input value not updated when I use jquery .val('xyz')
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edited Nov 12 '14 at 23:47
Josh Crozier
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Can I click a button programmatically for a predefined intent?
...re there is no need of displaying UI.
Can I get the "Send" button click from the MMS-SMSProvider in Android?
3 Answers
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Can I make the foreign key field optional in Django model
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Sure, just add blank=True, null=True for each field that you want to remain optional like
subject = models.ForeignKey(subjects, blank=True, null=True)
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Query a parameter (postgresql.conf setting) like “max_connections”
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You can use SHOW:
SHOW max_connections;
This returns the currently effective setting. Be aware that it can differ from the setting in postgresql.conf as there are a multiple ways to set run-time parameters in PostgreSQL. To reset the "original" s...
Install autoreconf on OS X v10.7 (Lion)?
I'm attempting to re-install Ruby 1.9.3 with a patch that will allow me to use ruby-debug .
6 Answers
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setup cron tab to specific time of during weekdays
I am trying to setup a cron job on a Ubuntu server. We want the cron job to run the script at certain times of the day and on some specific days of the week. For example, we want to setup a cron job that runs the script with the following sequence:
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