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How to set a default value for a datetime column to record creation time in a migration?
...
You can add a function in a model like this:
before_create :set_foo_to_now
def set_foo_to_now
self.foo = Time.now
end
So that the model will set the current time in the model.
You can also place some sql code in the migration for setting the default value at the database le...
matplotlib: colorbars and its text labels
...ata, cmap=cMap)
#legend
cbar = plt.colorbar(heatmap)
cbar.ax.get_yaxis().set_ticks([])
for j, lab in enumerate(['$0$','$1$','$2$','$>3$']):
cbar.ax.text(.5, (2 * j + 1) / 8.0, lab, ha='center', va='center')
cbar.ax.get_yaxis().labelpad = 15
cbar.ax.set_ylabel('# of contacts', rotation=270)
...
Maven parent pom vs modules pom
... checkout and make things even more handy. Actually, this is how I like to setup maven projects and a VCS repository for large builds: it just works, it scales well, it gives all the flexibility you may need.
If the answer is no (back to the initial question), then I think you can live with patte...
JSON.Net Self referencing loop detected
...t(ResultGroups, Formatting.None,
new JsonSerializerSettings()
{
ReferenceLoopHandling = ReferenceLoopHandling.Ignore
});
JSON.NET Error Self referencing loop detected for type
it also referes to t...
How can I set Image source with base64
I want to set the Image source to a base64 source but it does not work:
4 Answers
4
...
width:auto for fields
...:3px'>
<input size='' style='width:100%;margin:-3px;border:2px inset #eee' />
<br /><br />
<input size='' style='width:100%' />
</form>
</div>
share
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Is Redis just a cache?
...lets you operate on the values. There are 5 data types in Redis - Strings, Sets, Hash, Lists and Sorted Sets. Each data type exposes various operations.
The best way to understand Redis is to model an application without thinking about how you are going to store it in a database.
Lets say we want...
How do Third-Party “tracking cookies” work?
...
First, cookies are set and retrieved through HTTP headers. If your browser sends a request to http://example.com, then the response might come back with a header that says Set-Cookie: foo=bar. Your browser stores this cookie, and on any subsequ...
How to configure an app to run correctly on a machine with a high DPI setting (e.g. 150%)?
...s application in C#. When I run the application on a machine with high DPI settings (e.g. 150%), the application gets scaled up. So far so good!
But instead of rendering the fonts with a higher font size, all texts are just scaled up, too. That of course leads to very blurry text (on all controls li...
MFC 的SetWindowPos 用法 - C/C++ - 清泛网 - 专注C/C++及内核技术
MFC 的SetWindowPos 用法许多软件，特别是占桌面面积不是很大的软件，通常都提供了一个常居顶端的功能（可能有的软件不是这么叫法，但作用是相同的），它的作用是保...许多软件，特别是占桌面面积不是很大的软件，通常都提...