Question

我设置了一个HyperlinkedModelSerializer，其中使用HyperlinkedRelatedField对其他模型进行了一些引用。这很好用：

var griddle_prep = function($el){
        if(!$el.data('init')){
            $el.addClass('griddle-initialized');
            $el.data('init',$el.html());
        }
    };

    var griddle_update = function($el){
        var per_row = 6,
            window_width = $(window).width();
        // instead of calculating heights we're just going to piggyback breakpoints
        // to determine how many items are in each row, see _griddle.scss
        if(window_width<960){
            per_row = 5;
        }
        if(window_width<768){
            per_row = 4;
        }
        if(window_width<650){
            per_row = 3;
        }
        if(window_width<530){
            per_row = 2;
        } 

        // proceed with updating the markup
        if($el.data('init')) {
            // wipe out the existing markup and use the stored 'template'
            $el.html($el.data('init'));

            // wrap each 'row' with a wrapper
            var divs = $el.children(),
                markup = '<div class="wrapper group griddle-row">',
                i = 0;

            divs.each(function(){
                if(i>=per_row){
                    markup += '</div>';
                    markup += '<div class="wrapper group griddle-row">';
                    i = 0;
                }
                markup += $(this).wrap('<div>').parent().html();
                i++;
            });

            markup += '</div>';
            $el.html(markup);
        }
    };

    var griddle_clean_up = function($el){
        var $details = $el.find('.griddle-detail-display');
        if($details.length){
            $details.remove();
            $el.find('.griddle-active').removeClass('griddle-active');
        }
    };

    var griddle_position_indicator = function($el,$details){
        var indicator_left = $el.offset().left + parseInt($el.outerWidth()/2,10);
        $details.find('.griddle-indicator').css('left',indicator_left+'px');
    };

    var $griddles = $('.griddle');
    if($griddles.length){

        $('.griddle-details').hide();

        // bind our details
        $('body').on('click','.griddle-trigger',function(e){
            e.preventDefault();
            var $this = $(this),
                $row = $this.parents('.griddle-row'),
                target_row_index = $row.index(),
                $griddle = $row.parents('.griddle'),
                toggle = $(this).hasClass('griddle-active'),
                $current_row = $griddle.find('.griddle-detail-display'),
                $existing_details = $current_row,
                current_row_index = $current_row.prev().index(),
                $target_details = $this.parents('.griddle-item').find('.griddle-details').clone().show().removeAttr('id').addClass('griddle-detail-display').hide();

            $griddle.find('.griddle-active').removeClass('griddle-active');

            if(toggle){
                $existing_details.slideUp('fast',function(){
                    $existing_details.remove();
                });
            }else{

                // is a current row already displayed?
                if(current_row_index>-1){

                    // check to see if we're just swapping out
                    if(target_row_index===current_row_index){
                        // just swap it out
                        $current_row.remove();
                        $row.after($target_details);
                        $target_details.show();
                    } else {
                        // remove the non-applicable row
                        $existing_details.slideUp('fast',function(){
                            $existing_details.remove();
                        });

                        // show the applicable row
                        $row.after($target_details);
                        $griddle.find('.griddle-detail-display').slideDown('fast');
                    }

                } else {
                    // no current row, just slide it down
                    $row.after($target_details);
                    $griddle.find('.griddle-detail-display').slideDown('fast');
                }

                $this.addClass('griddle-active');
                griddle_position_indicator($this,$target_details);
            }

        });

        $griddles.each(function(){
            var $griddle = $(this);

            // going to grab the griddle HTML because we're going to be swapping it in and out when resizing
            griddle_prep($griddle);

            // init the rows
            griddle_update($griddle);

            // update the rows on resize
            $(window).smartresize(function(){
                griddle_clean_up($griddle);
                griddle_update($griddle);
            });
        });
    }

但是我需要对其他一些字段进行一些数据转换，所以我覆盖了class LicenseSerializer(serializers.HyperlinkedModelSerializer): style = serializers.HyperlinkedRelatedField( view_name='styles-detail', queryset=Style.objects.all() ) order = serializers.HyperlinkedRelatedField( view_name='orders-detail', queryset=Order.objects.all() )：

to_internal_value

此时HyperlinkedRelatedField不再有效。我收到一个错误说：

def to_internal_value(self, data): return data

至少在我看来，HyperlinkedRelatedField不再有效吗？

这是Serializer崩溃时的转储：

Cannot assign "'[hyperlinked identity url]'": "[Model.attribute]" must be a "[hyperlinked model]" instance.

我在这里做错了什么？

谢谢你的时间！

Answer 1

你不能这样做：

def to_internal_value(self, data):
    return data

Serializer.to_internal_value验证收到的数据（data）并将其转换为在ORM级别有用的类型。

对于HyperLinkedRelatedField，它会检索（通过HyperLinkedRelatedField.to_internal_value）要链接的对象。在您的情况下，您直接传递了包含URL而不是对象的未经验证的data。如果数据只包含原始类型，但仍然不安全，那么这可能有效。

如果您要进行任何转换，请先检索对象：

def to_internal_value(self, data):
    validated_data = super().to_internal_value(data)
    # Your transformations on validated_data
    return validated_data

HyperlinkedRelatedField无法使用to_internal_value（Django Rest Framework）

1 个答案: