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When should one use RxJava Observable and when simple Callback on Android?
... the advantages of RxJava over Callback is very limited. The simple getUserPhoto example:
RxJava:
api.getUserPhoto(photoId)
.observeOn(AndroidSchedulers.mainThread())
.subscribe(new Action1<Photo>() {
@Override
public void call(Photo photo) {
//...
Django filter queryset __in for *every* item in list
...e the option of using custom queries.
Some examples
Test setup:
class Photo(models.Model):
tags = models.ManyToManyField('Tag')
class Tag(models.Model):
name = models.CharField(max_length=50)
def __unicode__(self):
return self.name
In [2]: t1 = Tag.objects.create(name='ho...
Rails find record with zero has_many records associated [duplicate]
... found it here: https://stackoverflow.com/a/5570221/417872
City.includes(:photos).where(photos: { city_id: nil })
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Posting a File and Associated Data to a RESTful WebService preferably as JSON
...t use any file_id (uploaded file identifier to the server) in API:
Create photo object on server:
POST: /projects/{project_id}/photos
body: { name: "some_schema.jpg", comment: "blah"}
response: photo_id
Upload file (note that file is in singular form because it is only one per photo):
POST...
How to save picture to iPhone photo library?
...ogram has generated (possibly from the camera, possibly not) to the system photo library on the iPhone?
15 Answers
...
test a file upload using rspec - rails
...ut I do have a Test::Unit test that does something similar for uploading a photo. I set up the uploaded file as an instance of ActionDispatch::Http::UploadedFile, as follows:
test "should create photo" do
setup_file_upload
assert_difference('Photo.count') do
post :create, :photo => @pho...
JavaScript: Upload file
...
Pure JS
You can use fetch optionally with await-try-catch
let photo = document.getElementById("image-file").files[0];
let formData = new FormData();
formData.append("photo", photo);
fetch('/upload/image', {method: "POST", body: formData});
async function SavePhoto(inp)
{
l...
Images can't contain alpha channels or transparencies
...
AFAIK png with transparency is not allowed. use jpg OR update your png (photoshop or whatever you using to create the png) and delete the transparency areas. if you work with shadows, use jpg, that will do no headaches.
s...
How can I save an image to the camera roll?
...
You use the UIImageWriteToSavedPhotosAlbum() function.
//Let's say the image you want to save is in a UIImage called "imageToBeSaved"
UIImageWriteToSavedPhotosAlbum(imageToBeSaved, nil, nil, nil);
Edit:
//ViewController.m
- (IBAction)onClickSavePhoto:(...
Automatically deleting related rows in Laravel (Eloquent ORM)
...nt to do the cleanup:
class User extends Eloquent
{
public function photos()
{
return $this->has_many('Photo');
}
// this is a recommended way to declare event handlers
public static function boot() {
parent::boot();
static::deleting(function($user...