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Specifying column name in a “references” migration
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Rails cheats - it doesn't really use indexes by default. Now if you want indexes (which are a great idea - despite the fact that rails will completely ignore them), than you can certainly add them. You will want to check out the guide I link for more info on migrations ...
JavaScript hide/show element
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function showStuff(id, text, btn) {
document.getElementById(id).style.display = 'block';
// hide the lorem ipsum text
document.getElementById(text).style.display = 'none';
// hide the link
btn.style.display = 'none';
}
<td class="post">
<a href="...
How do short URLs services work?
... turns it into a Moved not Moved Permanently. This is a subtle difference. By adding the timestamp, the browser considers it should check whether the resource is changed or not when this timeout it reached. Others, like is.gd, use a normal 301 Moved Permanently and the browser doesn't need to re-che...
How to copy Docker images from one host to another without using a repository
...file path or shared NFS place see the following example.
Get the image id by doing:
sudo docker images
Say you have an image with id "matrix-data".
Save the image with id:
sudo docker save -o /home/matrix/matrix-data.tar matrix-data
Copy the image from the path to any host. Now import to you...
Will the base class constructor be automatically called?
...) when there is a constructor with no arguments.
You can easily test this by printing out the age of the customer after construction (link to ideone with a demo).
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How to convert ActiveRecord results into an array of hashes
...on
You should use as_json method which converts ActiveRecord objects to Ruby Hashes despite its name
tasks_records = TaskStoreStatus.all
tasks_records = tasks_records.as_json
# You can now add new records and return the result as json by calling `to_json`
tasks_records << TaskStoreStatus.l...
Disable browser 'Save Password' functionality
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You can prevent the browser from matching the forms up by randomizing the name used for the password field on each show. Then the browser sees a password for the same the url, but can't be sure it's the same password. Maybe it's controlling something else.
Update: note that th...
Should functions return null or an empty object?
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Last but not least there would be bool GetUserById(Guid userId, out UserEntity result) - which I would prefer to the "null" return-value, and which isn't as extreme as throwing an exception. It allows beautiful null-free code like if(GetUserById(x,u)) { ... }.
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JSON.NET Error Self referencing loop detected for type
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I solved my issus by adding "JsonConvert.DefaultSettings" = () => new JsonSerializerSettings {....} in the class "Startup.cs"
– Beldi Anouar
Apr 4 at 9:30
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How to obtain the last path segment of a URI
...making trouble. Need something more good getLastPathSegment() answer given by @paul_sns is perfect.
– Vaibhav Kadam
Jan 9 '18 at 23:21
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