是的图像验证，仅当图像已上传

Question

我正在尝试为特色图片编写验证。此字段也可以为空，因此我希望此字段作为图片验证，仅当图片已上传时。

const schema = Yup.object({
        featured_image: Yup.mixed().when("featured_image", {
            is: (value) => value?.length,
            then: (schema) =>
                schema
                    .test("name", "Image is required", (value) => {
                        return (
                            value != undefined &&
                            value[0] &&
                            value[0].name !== ""
                        );
                    })
                    .test("fileSize", "File must be less than 2MB", (value) => {
                        return (
                            value != undefined &&
                            value[0] &&
                            value[0].size <= 2000000
                        );
                    })
                    .test("type", "Only images are supported", (value) => {
                        return (
                            value != undefined &&
                            value[0] &&
                            value[0].type.includes("image")
                        );
                    }),
            otherwise: (schema) => schema.nullable(),
        }),
    });

目前，它给出的错误是：Error: Cyclic dependency, node was:"featured_image"

Answer 1

循环错误与您的必填或非必填字段无关，您需要将 'featured-image' 添加到依赖项列表，试试这个：

const validationSchema = yup.object().shape({
    //your scheme here
    },
     //cyclic dependencies
        [
            ['featured_image', 'featured_image'],
        ]
    )

是的图像验证，仅当图像已上传

Yup image validation, only if image is uploaded

reactjs

yup