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  NSString *urlString = @"api/refundo/connect_chat";
  NSURL *URL = [NSURL URLWithString:urlString relativeToURL:self.baseURL];

  NSDictionary *parameters = @{@"nonce": nonce,
                               @"user_id":[self getTaxPayerEmail]};
  NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:URL];
  request.HTTPMethod = @"POST";
  request.HTTPBody = [NSJSONSerialization dataWithJSONObject:parameters options:0 error:nil];
  [request setValue:@"application/json" forHTTPHeaderField:@"Content-Type"];

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# simple class with no models mappings
class LayerAuthSerializer(serializers.Serializer):
    nonce = serializers.CharField()
    display_name = serializers.CharField(required=False)
    avatar_url=serializers.CharField(required=False)
    

# a complex class definition
class CreateUserSerializer(serializers.Serializer):
	"""

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# restart
pg_ctl -D /usr/local/var/postgres -l /usr/local/var/postgres/server.log start

#stop manually
pg_ctl -D /usr/local/var/postgres stop -s -m fast

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/Library/Python/2.7/site-packages

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pip freeze | grep celery

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 # contains only values passed on function invokation
  *args 
 # contains only key-values passed on function invokation
  **kwargs

  # function definition and user
  def table_things(*args,**kwargs):
	# works normal python dictionary
	user = kwargs.pop('user',None)

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from rest_framework import serializers
raise serializers.ValidationError({
'error': 'User already has liked this news.',
'code' : exception_handler.ERROR_DATA_INCONSISTENCY
})

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date_joined = models.DateTimeField(help_text=('date joined'), default=timezone.now)
company = models.CharField(max_length=200, blank=True, null=True,
    	help_text=("Current company user is working for"),
    )
# foreign key with no related name
user = models.ForeignKey(
    User,
    on_delete=models.CASCADE,
    related_name='+',
)

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@OnClick(R.id.submit)
public void submit(View view) {
  // TODO submit data to server...
}

All arguments to the listener method are optional.

@OnClick(R.id.submit)
public void submit() {
  // TODO submit data to server...

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 getSupportFragmentManager()
                .beginTransaction()
                .add(containerViewId, fragment, fragmentTag)
                .disallowAddToBackStack()
                .commit();