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Computed / calculated / virtual / derived columns in PostgreSQL
...l, but makes makes life a bit easier).
Suppose my computation is md5(some_string_field), then I create the index as:
CREATE INDEX some_string_field_md5_index ON some_table(MD5(some_string_field));
Now, any queries that act on MD5(some_string_field) will use the index rather than computing it fr...
Inline SVG in CSS
... and if it doesn't work (it might complain about invalid characters in the string), you can simply use https://www.base64encode.org/.
Example to set a div background:
var mySVG = "<svg xmlns='http://www.w3.org/2000/svg' width='10' height='10'><linearGradient id='gradient'><stop ...
How to implement a unique index on two columns in rails
...rançoisBeausoleil %w(user_id content_id) in ruby just creates an array of strings, it's not special to rails. You can do the same with "user_id content_id".split which is still creating an array of strings. I am sure you know this, this comment is just so other readers don't relate this to rails in...
What's an elegant way to conditionally add a class to an HTML element in a view?
...classes mixed with default classes, then you need to put that logic into a string interpolation or ERB tag.
Here's an updated approach that avoids putting any logic into the views:
<div class="<%= class_string(ok: @success) %>">
some message here
</div>
class_string method
...
JSP tricks to make templating easier?
...y '.', and /WEB-INF/templates/ prefix if it does not start with a '/')
String template = (String)jspContext.getAttribute("template");
if (template != null) {
if (!template.contains("."))
template += ".jsp";
if (!template.startsWith("/"))
template = "/W...
How Do I Get the Query Builder to Output Its Raw SQL Query as a String?
...hing like that:
array(1) {
[0]=>
array(3) {
["query"]=>
string(21) "select * from "users""
["bindings"]=>
array(0) {
}
["time"]=>
string(4) "0.92"
}
}
(Thanks to Joshua's comment below.)
...
Fixed width buttons with Bootstrap
...
I added an extra margin-left because I wanted the buttons to be separated. Worked perfectly. All the same width.
– Tomas Gonzalez
Nov 15 '16 at 3:14
...
How do I add comments to package.json for npm install?
...r in git commit diffs or in editor while working with package.json.
And no extra tools involved, just plain and valid JSON.
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Is git-svn dcommit after merging in git dangerous?
... use git merge --no-ff work -m "commit message" instead of having an extra git commit --amend step
– tekumara
Jun 14 '12 at 2:06
3
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Defining custom attrs
...olor/my_color", "@layout/my_layout")
color
boolean
dimension
float
integer
string
fraction
enum - normally implicitly defined
flag - normally implicitly defined
You can set the format to multiple types by using |, e.g., format="reference|color".
enum attributes can be defined as follows:
<att...