Python django.db.models.ImageField() Examples

def handle(self, *args, **options):
        storage = DefaultStorage()

        for model in _get_models(['shapes', 'photos', 'shapes']):
            has_images = False

            # transfer image fields
            for f in model._meta.fields:
                if isinstance(f, models.ImageField):
                    has_images = True
                    if hasattr(storage, 'transfer'):
                        filenames = model.objects.all() \
                            .values_list(f.name, flat=True)
                        print '%s: %s' % (model, f)
                        for filename in progress.bar(filenames):
                            if filename and storage.local.exists(filename):
                                storage.transfer(filename)

            # transfer thumbs
            if has_images:
                print '%s: thumbnails' % model
                ids = model.objects.all().values_list('id', flat=True)
                ct_id = ContentType.objects.get_for_model(model).id
                for id in progress.bar(ids):
                    ensure_thumbs_exist_task.delay(ct_id, id) 

def handle(self, *args, **options):
        storage = DefaultStorage()

        for model in _get_models(['shapes', 'photos', 'shapes']):
            has_images = False

            # transfer image fields
            for f in model._meta.fields:
                if isinstance(f, models.ImageField):
                    has_images = True
                    if hasattr(storage, 'transfer'):
                        filenames = model.objects.all() \
                            .values_list(f.name, flat=True)
                        print '%s: %s' % (model, f)
                        for filename in progress.bar(filenames):
                            if filename and storage.local.exists(filename):
                                storage.transfer(filename)

            # transfer thumbs
            if has_images:
                print '%s: thumbnails' % model
                ids = model.objects.all().values_list('id', flat=True)
                ct_id = ContentType.objects.get_for_model(model).id
                for id in progress.bar(ids):
                    ensure_thumbs_exist_task.delay(ct_id, id) 

def to_json(self):
        """
        序列模型实例，让具体的模型实例可以 json 化

        属性说明：
        a = RecodeImage.objects.get(recode_number="5+8")
        a._meta --> (<django.db.models.fields.AutoField: id>,
                    <django.db.models.fields.CharField: recode_number>,
                    <django.db.models.fields.files.ImageField: recode_image_path>,
                    <django.db.models.fields.DateTimeField: add_time>)
                    这是一个可迭代的对象，通过遍历，取得每个字段的名字（field.name）
        getattr(self, attr) -->  获取模型实例的字段值
        ImageField 字段使用 str() 字符串化
        """

        fields = []
        for field in self._meta.fields:
            fields.append(field.name)

        d = {}
        for attr in fields:
            d[attr] = str(getattr(self, attr))

        return json.dumps(d) 

def test_pillow_installed(self):
        try:
            from PIL import Image  # NOQA
        except ImportError:
            pillow_installed = False
        else:
            pillow_installed = True

        class Model(models.Model):
            field = models.ImageField(upload_to='somewhere')

        field = Model._meta.get_field('field')
        errors = field.check()
        expected = [] if pillow_installed else [
            Error(
                'Cannot use ImageField because Pillow is not installed.',
                hint=('Get Pillow at https://pypi.org/project/Pillow/ '
                      'or run command "pip install Pillow".'),
                obj=field,
                id='fields.E210',
            ),
        ]
        self.assertEqual(errors, expected) 

def test_pillow_installed(self):
        try:
            from PIL import Image  # NOQA
        except ImportError:
            pillow_installed = False
        else:
            pillow_installed = True

        class Model(models.Model):
            field = models.ImageField(upload_to='somewhere')

        field = Model._meta.get_field('field')
        errors = field.check()
        expected = [] if pillow_installed else [
            Error(
                'Cannot use ImageField because Pillow is not installed.',
                hint=('Get Pillow at https://pypi.org/project/Pillow/ '
                      'or run command "pip install Pillow".'),
                obj=field,
                id='fields.E210',
            ),
        ]
        self.assertEqual(errors, expected) 

def get_field_result(self, result, field_name):
        if isinstance(result.field, models.ImageField):
            if result.value:
                img = getattr(result.obj, field_name)
                result.text = mark_safe('<a href="%s" target="_blank" title="%s" data-gallery="gallery"><img src="%s" class="field_img"/></a>' % (img.url, result.label, img.url))
                self.include_image = True
        return result

    # Media 

def get_field_attrs(self, attrs, db_field, **kwargs):
        if isinstance(db_field, models.ImageField):
            attrs['widget'] = AdminImageWidget
            attrs['form_class'] = AdminImageField
            self.include_image = True
        return attrs 

def get_field_result(self, result, field_name):
        if isinstance(result.field, models.ImageField):
            if result.value:
                img = getattr(result.obj, field_name)
                result.text = mark_safe('<a href="%s" target="_blank" title="%s" data-gallery="gallery"><img src="%s" class="field_img"/></a>' % (img.url, result.label, img.url))
                self.include_image = True
        return result

    # Media 

def get_field_attrs(self, attrs, db_field, **kwargs):
        if isinstance(db_field, models.ImageField):
            attrs['widget'] = AdminImageWidget
            attrs['form_class'] = AdminImageField
            self.include_image = True
        return attrs 

def get_field_result(self, result, field_name):
        if isinstance(result.field, models.ImageField):
            if result.value:
                img = getattr(result.obj, field_name)
                result.text = mark_safe('<a href="%s" target="_blank" title="%s" data-gallery="gallery"><img src="%s" class="field_img"/></a>' % (img.url, result.label, img.url))
                self.include_image = True
        return result

    # Media 

def get_field_attrs(self, attrs, db_field, **kwargs):
        if isinstance(db_field, models.ImageField):
            attrs['widget'] = AdminImageWidget
            attrs['form_class'] = AdminImageField
            self.include_image = True
        return attrs 

def get_field_result(self, result, field_name):
        if isinstance(result.field, models.ImageField):
            if result.value:
                img = getattr(result.obj, field_name)
                result.text = mark_safe('<a href="%s" target="_blank" title="%s" data-gallery="gallery"><img src="%s" class="field_img"/></a>' % (img.url, result.label, img.url))
                self.include_image = True
        return result

    # Media 

def get_field_attrs(self, attrs, db_field, **kwargs):
        if isinstance(db_field, models.ImageField):
            attrs['widget'] = AdminImageWidget
            attrs['form_class'] = AdminImageField
            self.include_image = True
        return attrs 

def get_field_result(self, result, field_name):
        if isinstance(result.field, models.ImageField):
            if result.value:
                img = getattr(result.obj, field_name)
                result.text = mark_safe('<a href="%s" target="_blank" title="%s" data-gallery="gallery"><img src="%s" class="field_img"/></a>' % (img.url, result.label, img.url))
                self.include_image = True
        return result

    # Media 

def test_create_translation_field_has_correct_descriptor(self):
        field = create_translation_field(models.fields.CharField(), "en")
        assert field.descriptor_class == TranslationDescriptor

        field = create_translation_field(models.FileField(), "en")
        assert field.descriptor_class == files.FileTranslationDescriptor

        field = create_translation_field(models.ImageField(), "en")
        assert field.descriptor_class == files.FileTranslationDescriptor

        field = create_translation_field(models.fields.TextField(), "en")
        assert field.descriptor_class == TranslationDescriptor 

def formfield(self, **kwargs):
        defaults = {'form_class': forms.ImageField}
        defaults.update(kwargs)
        return super().formfield(**defaults) 

def get_field_attrs(self, attrs, db_field, **kwargs):
        if isinstance(db_field, models.ImageField):
            attrs['widget'] = AdminImageWidget
            attrs['form_class'] = AdminImageField
            self.include_image = True
        return attrs 

def get_field_result(self, result, field_name):
        if isinstance(result.field, models.ImageField):
            if result.value:
                img = getattr(result.obj, field_name)
                result.text = mark_safe('<a href="%s" target="_blank" title="%s" data-gallery="gallery"><img src="%s" class="field_img"/></a>' % (img.url, result.label, img.url))
                self.include_image = True
        return result

    # Media 

def test_should_image_convert_string():
    assert_conversion(models.ImageField, graphene.String) 

def get_field_attrs(self, attrs, db_field, **kwargs):
        if isinstance(db_field, models.ImageField):
            attrs['widget'] = AdminImageWidget
            attrs['form_class'] = AdminImageField
            self.include_image = True
        return attrs 

def get_field_result(self, result, field_name):
        if isinstance(result.field, models.ImageField):
            if result.value:
                img = getattr(result.obj, field_name)
                result.text = mark_safe('<a href="%s" target="_blank" title="%s" data-gallery="gallery"><img src="%s" class="field_img"/></a>' % (img.url, result.label, img.url))
                self.include_image = True
        return result

    # Media 

def get_field_attrs(self, attrs, db_field, **kwargs):
        if isinstance(db_field, models.ImageField):
            attrs['widget'] = AdminImageWidget
            attrs['form_class'] = AdminImageField
            self.include_image = True
        return attrs 

def get_field_result(self, result, field_name):
        if isinstance(result.field, models.ImageField):
            if result.value:
                img = getattr(result.obj, field_name)
                result.text = mark_safe('<a href="%s" target="_blank" title="%s" data-gallery="gallery"><img src="%s" class="field_img"/></a>' % (img.url, result.label, img.url))
                self.include_image = True
        return result

    # Media 

def render(self, obj):
        src = helper.call_or_get(obj, self.attr)

        if isinstance(src, ModelImageField):
            src = settings.MEDIA_URL + src

        p_params = {}
        for key in self.params.keys():
            p_params[key] = helper.call_or_get(obj, self.params[key])

        p_params['src'] = src

        return '<img%s/>' % (
            flatatt(p_params)
        ) 

def test_image_field(self):
        field = models.ImageField(upload_to="foo/barness", width_field="width", height_field="height")
        name, path, args, kwargs = field.deconstruct()
        self.assertEqual(path, "django.db.models.ImageField")
        self.assertEqual(args, [])
        self.assertEqual(kwargs, {"upload_to": "foo/barness", "width_field": "width", "height_field": "height"}) 

def get_field_attrs(self, attrs, db_field, **kwargs):
        if isinstance(db_field, models.ImageField):
            attrs['widget'] = AdminImageWidget
            attrs['form_class'] = AdminImageField
            self.include_image = True
        return attrs 

def get_field_result(self, result, field_name):
        if isinstance(result.field, models.ImageField):
            if result.value:
                img = getattr(result.obj, field_name)
                result.text = mark_safe('<a href="%s" target="_blank" title="%s" data-gallery="gallery"><img src="%s" class="field_img"/></a>' % (img.url, result.label, img.url))
                self.include_image = True
        return result

    # Media 

def get_field_attrs(self, attrs, db_field, **kwargs):
        if isinstance(db_field, models.ImageField):
            attrs['widget'] = AdminImageWidget
            attrs['form_class'] = AdminImageField
            self.include_image = True
        return attrs 

def get_field_result(self, result, field_name):
        if isinstance(result.field, models.ImageField):
            if result.value:
                img = getattr(result.obj, field_name)
                result.text = mark_safe('<a href="%s" target="_blank" title="%s" data-gallery="gallery"><img src="%s" class="field_img"/></a>' % (img.url, result.label, img.url))
                self.include_image = True
        return result

    # Media 

def test_image_field(self):
        field = models.ImageField(upload_to="foo/barness", width_field="width", height_field="height")
        name, path, args, kwargs = field.deconstruct()
        self.assertEqual(path, "django.db.models.ImageField")
        self.assertEqual(args, [])
        self.assertEqual(kwargs, {"upload_to": "foo/barness", "width_field": "width", "height_field": "height"})