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Testing for empty or nil-value string [duplicate]
...lse (because of short-circuiting).
This should be sufficient:
variable = id if variable.nil? || variable.empty?
If you're working with Ruby on Rails, Object.blank? solves this exact problem:
An object is blank if it’s false, empty, or a whitespace string. For example, "", " ", nil, [], a...
How do I force files to open in the browser instead of downloading (PDF)?
... your HTTP server (or, if you are generating the PDF response from server-side code: your server-side programming language).
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add created_at and updated_at fields to mongoose schemas
...timestamps: { createdAt: 'created_at' } });
http://mongoosejs.com/docs/guide.html#timestamps
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How can I get zoom functionality for images?
...me as
ImageView. Example:
TouchImageView img = (TouchImageView) findViewById(R.id.img);
If you are using TouchImageView in xml, then you must provide the full package
name, because it is a custom view. Example:
<com.example.touch.TouchImageView
android:id="@+id/img”
android:layout_w...
PersistentObjectException: detached entity passed to persist thrown by JPA and Hibernate
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This is a typical bidirectional consistency problem. It is well discussed in this link as well as this link.
As per the articles in the previous 2 links you need to fix your setters in both sides of the bidirectional relationship. An example s...
jQuery Validate - require at least one field in a group to be filled
I'm using the excellent jQuery Validate Plugin to validate some forms. On one form, I need to ensure that the user fills in at least one of a group of fields. I think I've got a pretty good solution, and wanted to share it. Please suggest any improvements you can think of.
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Overloading and overriding
What is the difference between overloading and overriding.
12 Answers
12
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Disable password authentication for SSH [closed]
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Many guides suggest changing ChallengeResponseAuthentication, PasswordAuthentication, UsePAM from yes to no on server. Successfully tested under Debian/Ubuntu.
– anon
Apr 13 '18 at 10:29
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Maintain aspect ratio of div but fill screen width and height in CSS?
...r that has a fixed aspect ratio of approximately 16:9 landscape, like a video.
9 Answers
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How to make a JSONP request from Javascript without JQuery?
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Here's a JSBin that can be used to fiddle with JSONP from Wikipedia. It was referenced in this answer.
– rkagerer
Mar 8 '13 at 14:07
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