douwu5428 2017-06-27 02:34
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如何在Golang中将数组文档设置为Redis?

I have a problemwhen insert document in to redis.

I have a struct of data in Go:

type ArticleCovers struct {
    ID             int
    Covers         ArticleCovers
    ArticleTypeID  int
    Address        Address     `gorm:"ForeignKey:AddressID"`
}

I want to add a data like this into Redis:

[ID:1 Cover:[http://chuabuuminh.vn/UserImages/2012/12/10/1/chinh_dien_jpg.jpg] ArticleTypeID:1 Address:map[Street: City:<nil> District:<nil> DistrictID:0 ID:0 Slug: Lat:0 Long:0 Ward:<nil> WardID:0 CityID:0]] 

But when I run Redis.HMSet("test", structs.Map(ret)) it return the error: redis: can't marshal postgresql.ArticleCovers (consider implementing encoding.BinaryMarshaler).

Who can help me fix my problem, thks you so much!

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  • douzao2992 2017-06-27 05:29
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    Like the error message says, you need to implement the BinaryMarshaler interface for your ArticleCovers type:

    type ArticleCovers struct {
        ID             int
        Covers         ArticleCovers
        ArticleTypeID  int
        Address        Address     `gorm:"ForeignKey:AddressID"`
    }
    
    func (ac ArticleCovers) MarshalBinary() ([]byte, error) {
        return []byte(fmt.Sprintf("%v-%v", ac.ID, ac.ArticleTypeID)), nil
    }
    

    Note that this only adds the ID and ArticleTypeID fields. I don't know what the ArticleCovers and Address types look like, but often you want to call the same methods on that:

    func (ac ArticleCovers) MarshalBinary() ([]byte, error) {
        covers, err := ac.Covers.MarshalBinary()
        if err != nil {
            return nil, err
        }
        address, err := ac.Address.MarshalBinary()
        if err != nil {
            return nil, err
        }
    
        return []byte(fmt.Sprintf("%v-%v-%v-%v",
            ac.ID, ac.ArticleTypeID, covers, address)
    }
    

    I don't know if this format makes sense for your data. You may want to use a defined encoding format such as json.

    You will probably also want to implement the BinaryUnmarshaler interface. Doing that is left as an exercise ;-)

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