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Rails find record with zero has_many records associated [duplicate]
...he's using that to his advantage to check whether a required database identifier is present. If it's not, then there was no record on the photos side of the join. You could also use photos: {id: nil} if that is more clear.
– Javid Jamae
Dec 8 '15 at 18:28
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cocktail party algorithm SVD implementation … in one line of code?
...m having errors in line 3 saying it has problem concatenating 2 matrix of different dimensions. How should I handle this problem?
– mshrestha
Feb 15 '17 at 17:11
1
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How do I write a correct micro-benchmark in Java?
...2: Always run with -XX:+PrintCompilation, -verbose:gc, etc., so you can verify that the compiler and other parts of the JVM are not doing unexpected work during your timing phase.
Rule 2.1: Print messages at the beginning and end of timing and warmup phases, so you can verify that there is no outpu...
How do I switch to another subversion branch in Intellij?
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The user expect similar experience from IDEA across different CSV, which is hard to do cause SVN approach looks "dumb" from GIT prospective. The confusion is in that "same experience" expectation from IDEA magic.
– smile-on
May 29 '15 at 1...
TypeError: ObjectId('') is not JSON serializable
...Id
class JSONEncoder(json.JSONEncoder):
def default(self, o):
if isinstance(o, ObjectId):
return str(o)
return json.JSONEncoder.default(self, o)
JSONEncoder().encode(analytics)
It's also possible to use it in the following way.
json.encode(analytics, cls=JSONEnc...
Clicking the text to select corresponding radio button
...ms to be a little unclickable space between the radio button and the label if done according to Nathan's answer. Here is how to make them join seamlessly (see this article):
<form>
<p>What is my middle name?</p>
<br>
<label><input id="349" type="radio" v...
Change bootstrap navbar collapse breakpoint without using LESS
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You have to write a specific media query for this, from your question, below 768px, the navbar will collapse, so apply it above 768px and below 1000px, just like that:
@media (min-width: 768px) and (max-width: 1000px) {
.collapse {
displa...
How can you find out which process is listening on a port on Windows?
... and taskkill /PID <pid> to then terminate the process, using /F if appropriate.
– BitMask777
Mar 4 '13 at 20:03
82
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Run a single test method with maven
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Wild card characters also work; both in the method name and class name.
If you're testing in a multi-module project, specify the module that the test is in with -pl <module-name>.
For integration tests use it.test=... option instead of test=...:
mvn -pl <module-name> -Dit.test=TestC...
A cron job for rails: best practices?
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What is the duration of this task? I'm using an if condition. I want to know how regularly this is run. I can't find any information about this in heroku website.
– Shubham Chaudhary
Feb 10 '15 at 9:35
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