type Model struct {    ID         int `gorm:"primary_key" json:"id"`    CreatedOn  int `json:"created_on"`    ModifiedOn int `json:"modified_on"`    DeletedOn  int `json:"deleted_on"`}

type Tag struct {    Model    Name       string `json:"name"`    CreatedBy  string `json:"created_by"`    ModifiedBy string `json:"modified_by"`    State      int    `json:"state"`}

type Article struct {    Model    TagID int `json:"tag_id" gorm:"index"`    Tag   Tag `json:"tag"`    Title         string `json:"title"`    Desc          string `json:"desc"`    Content       string `json:"content"`    CoverImageUrl string `json:"cover_image_url"`    CreatedBy     string `json:"created_by"`    ModifiedBy    string `json:"modified_by"`    State         int    `json:"state"`}

type Auth struct {    ID       int    `gorm:"primary_key" json:"id"`    Username string `json:"username"`    Password string `json:"password"`}