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How can I access and process nested objects, arrays or JSON?
...ts, i.e. its values are arrays or objects. Such structures can be accessed by consecutively applying dot or bracket notation.
Here is an example:
const data = {
code: 42,
items: [{
id: 1,
name: 'foo'
}, {
id: 2,
name: 'bar'
}]
};
Let's assume we w...
What is the (best) way to manage permissions for Docker shared volumes?
...ther than data containers.
I believe the canonical way to solve this is by using data-only containers. With this approach, all access to the volume data is via containers that use -volumes-from the data container, so the host uid/gid doesn't matter.
For example, one use case given in the documen...
How to set selected value of jquery select2?
...
how to set by text rather than val
– Rizwan Patel
Feb 11 '16 at 12:49
...
Rails: Using greater than/less than with a where statement
...d >= 201. This is fine for integers and numbers where you can increment by a single unit of interest.
If you have the number extracted into a well named constant this may be the easiest to read and understand at a glance.
Inverted logic
We can use the fact that x > y == !(x <= y) and use...
what is reverse() in Django
...d returns the actual url /foo/.
This means that you refer to the url only by its name attribute - if you want to change the url itself or the view it refers to you can do this by editing one place only - urls.py.
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How to add url parameters to Django template url tag?
...
Is there anyway to pass a dynamic number of kwargs by passing a dictionary from context? e.g. {% url target_link target_kwargs %} it would be like the equivalent of passing **kwargs to a function. I have a use case where target_link is variable and therefore number of kwargs ...
Pandas aggregate count distinct
...-02 15 0002
4 2013-04-02 30 0002
>>> df.groupby("date").agg({"duration": np.sum, "user_id": pd.Series.nunique})
duration user_id
date
2013-04-01 65 2
2013-04-02 45 1
>>> df.groupby("date").agg({"...
Why can a function modify some arguments as perceived by the caller, but not others?
...unction and outside it refer to the same value, both see the modification. By contrast, the n inside the function and outside it refer to different values after n was reassigned inside the function.
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Is a one column table good design? [closed]
...nce of one column tables are justified.
Edited in response to the comment by: Quassnoi
(source: ggpht.com)
In this schema I can define a foreign key in the table company_factories that does not require me to include Language column on the table, but if I don't have the table countries_id, I m...
How to find if div with specific id exists in jQuery?
...live('click', function(){
name = $(this).text();
if(document.getElementById(name) == null) {
$("div#chatbar").append("<div class='labels'><div id='" + name + "' style='display:none;'></div>" + name + "</div>");
} else {
alert('this record already exists');
}
}...