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Using group by on multiple columns
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Group By X means put all those with the same value for X in the one group.
Group By X, Y means put all those with the same values for both X and Y in the one group.
To illustrate using an example, let's say we have the following table, ...
ASP.Net error: “The type 'foo' exists in both ”temp1.dll“ and ”temp2.dll"
When running a web application project, at seemingly random times a page may fail with a CS0433 error: type exists in multiple DLL's. The DLL's are all generated DLL's residing in the "Temporary ASP.NET Files" directory.
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In Django, how do I check if a user is in a certain group?
...User.
from django.contrib.auth.models import User, Group
group = Group(name = "Editor")
group.save() # save this new group for this example
user = User.objects.get(pk = 1) # assuming, there is one initial user
user.groups.add(group) # user is now in the "Editor" group
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When is the @JsonProperty property used and what is it used for?
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Here's a good example. I use it to rename the variable because the JSON is coming from a .Net environment where properties start with an upper-case letter.
public class Parameter {
@JsonProperty("Name")
public String name;
@JsonProperty("Value")
public St...
Convert PEM to PPK file format
...ay to convert PEM files to PPK files? (you may guess that Amazon EC2 gives me a PEM file, and I need to use the PPK format for SSH connectivity).
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Converting an object to a string
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I would recommend using JSON.stringify, which converts the set of the variables in the object to a JSON string. Most modern browsers support this method natively, but for those that don't, you can include a JS version:
var obj = {
nam...
Javascript reduce() on Object
There is nice Array method reduce() to get one value from the Array. Example:
13 Answers
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Python: How to ignore an exception and proceed? [duplicate]
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except:
pass
Python docs for the pass statement
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pod install -bash: pod: command not found
I installed pod some time ago. However, it's stopped working so I'm working through this again.
21 Answers
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Html.DropdownListFor selected value not being set
... look online and have seen that it can be achieved by using the fourth parameter so like the below:
13 Answers
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