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Postgres dump of only parts of tables for a dev snapshot
...
On your larger tables you can use the COPY command to pull out subsets...
COPY (SELECT * FROM mytable WHERE ...) TO '/tmp/myfile.tsv'
COPY mytable FROM 'myfile.tsv'
https://www.postgresql.org/docs/current/static/sql-copy.html
You should consider maintaining a set of development data ra...
Why does Typescript use the keyword “export” to make classes and interfaces public?
...public", but asides from "export/private/protected" being a poorly matched set of access modifiers, I believe there is a subtle difference between the two that explains this.
In TypeScript, marking a class member as public or private has no effect on the generated JavaScript. It is simply a design ...
How to find all duplicate from a List? [duplicate]
...t;T> GetDuplicates<T>(this IEnumerable<T> source) {
HashSet<T> itemsSeen = new HashSet<T>();
HashSet<T> itemsYielded = new HashSet<T>();
foreach (T item in source) {
if (!itemsSeen.Add(item)) {
if (itemsYielded.Add(item)) {
...
Object of custom type as dictionary key
... based equality) can
explicitly flag themselves as being
unhashable by setting __hash__ = None
in the class definition. Doing so
means that not only will instances of
the class raise an appropriate
TypeError when a program attempts to
retrieve their hash value, but they
will also be ...
How can I tell Rails to use RSpec instead of test-unit when creating a new Rails app?
... to get a good understanding of what each option does.
Once everything is set you can run all your tests with:
bundle exec rspec
You can read more about the recommended spec_helper and rails_helper configurations on https://kolosek.com/rails-rspec-setup.
...
How to free memory in Java?
...here a way to free memory in Java, similar to C's free() function? Or is setting the object to null and relying on GC the only option?
...
Why use pip over easy_install? [closed]
... that included easy_install is no longer maintained. Its improvements over setuptools got merged back into setuptools. Trying to install distribute will just install setuptools instead.
easy_install itself is only quasi-maintained.
All of the cases where pip used to be inferior to easy_install—ins...
C++ project organisation (with gtest, cmake and doxygen)
.../include/) and your
headers must be able to include themselves with such a setup.
└── prj
├── include
│ └── prj
│ ├── header2.h
│ └── header.h
└── src
└── x.cpp
works well, because include paths work o...
Can we delete an SMS in Android before it reaches the inbox?
...tyInfo.name + ", priority=" + info.priority);
}
}
Check priority and set higher priority (in your manifest) than other receivers.
share
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Show/hide 'div' using JavaScript
...e by checking the computed value of the display property. If it's visible, set the display to none, otherwise remove the inline display styling, and if it's still hidden, set the display to the specified value or the hardcoded default, block.
function toggle (elements, specifiedDisplay) {
var ele...