Simple form examples with bootstrap
Good reference how to build bootstrap forms with simple_form.
Related cards:
Simple Form: Rendering errors without an appropriate attribute
Usually you add errors to :base in ActiveRecord, in case no appropriate attribute could be used to add the error.
Simple Form...
How to not die with ActionView::MissingTemplate when clients request weird formats
When HTTP clients make an request they can define which response formats they can process. They do it by adding a header to the HTTP request like this:
Accept: application/json
This means the client will only understand JSON respon...
Some tips for upgrading Bootstrap from 3 to 4
Recently I made an upgrade from Bootstrap 3 to Bootstrap 4 in a bigger project. Here are some tips how to plan and perform such an upgrade. The effort will scale with the size of the project and its structure. If your stylesheets already follow st...
Use form_for without the enclosing form tag
In rare cases you might need something like form_for (for using form builder methods on the resulting block element) but without the surrounding form. One such case would be upda...
Remove resource fork files from a FAT volume on MacOS
Be careful!
The following solution will delete files on a volume. If you don't know exactly what you're doing, you can run into big trouble with your computer.
I play mp3 files on my car stereo that are stored on a SD-C...
AngularJS directive to format a text with paragraphs and new lines
If you are using Angular and want something like Rails' simple_format which HTML-formats a plain-text input into paragraphs and line breaks, this directive is for you.
Any ...
HTML forms with multiple submit buttons
Most forms have a single submit button that will save the record when pressed.
Sometimes a form needs additional submit buttons like "accept" or "reject". Such buttons usually attempt a state transition while updating the record.
To process a fo...
How to deal with 'parent id missing' error in nested forms
tl;dr
- Use form models to handle this problem
- Or soften the validation to
validates_presence_of :parent
Usually you would validate presence of parent object id, like in this example:
class Parent < ActiveRecord::Base
has_many ...
When you want to format only line breaks, you probably do not want `simple_format`
For outputting a given String in HTML, you mostly want to replace line breaks with <br> or <p> tags.
You can use simple_format, but it has side effects like keeping some HTML.
If you only care about line breaks, you might...
How to emulate simple classes with plain JavaScript
If you want a class-like construct in JavaScript, you can use the module pattern below. The module pattern gives you basic class concepts like a constructor, private state, public methods.
Since the module pattern only uses basic JavaScript, your...