Go 如何将切片元素传递给函数
我正在清理一些代码,并试图将一个切片值(结构)传递给函数 我的结构如下所示:Go 如何将切片元素传递给函数,go,struct,Go,Struct,我正在清理一些代码,并试图将一个切片值(结构)传递给函数 我的结构如下所示: type GetRecipesPaginatedResponse struct { Total int `json:"total"` PerPage int `json:"per_page"` CurrentPage int `json:"current_page"` LastPage int `j
type GetRecipesPaginatedResponse struct {
Total int `json:"total"`
PerPage int `json:"per_page"`
CurrentPage int `json:"current_page"`
LastPage int `json:"last_page"`
NextPageURL string `json:"next_page_url"`
PrevPageURL interface{} `json:"prev_page_url"`
From int `json:"from"`
To int `json:"to"`
Data []struct {
ID int `json:"id"`
ParentRecipeID int `json:"parent_recipe_id"`
UserID int `json:"user_id"`
Name string `json:"name"`
Description string `json:"description"`
IsActive bool `json:"is_active"`
IsPublic bool `json:"is_public"`
CreatedAt time.Time `json:"created_at"`
UpdatedAt time.Time `json:"updated_at"`
BjcpStyle struct {
SubCategoryID string `json:"sub_category_id"`
CategoryName string `json:"category_name"`
SubCategoryName string `json:"sub_category_name"`
} `json:"bjcp_style"`
UnitType struct {
ID int `json:"id"`
Name string `json:"name"`
} `json:"unit_type"`
} `json:"data"`
}
for page := 1; page < 3; page++ {
newRecipes := getFromRecipesEndpoint(page, latestTimeStamp) //this returns an instance of GetRecipesPaginatedResponse
for _, newRecipe := range newRecipes.Data {
if rowExists(db, "SELECT id from community_recipes WHERE id=@id", sql.Named("id", newRecipe.ID)) {
insertIntoRecipes(db, true, newRecipe)
} else {
insertIntoRecipes(db, false, newRecipe)
}
}
}
func insertIntoRecipes(db *sql.DB, exists bool, newRecipe GetRecipesPaginatedResponse.Data) {
if exists {
//update the existing record in the DB
//perform some other updates with the information
} else {
//insert a new record into the DB
//insert some other information using this information
}
}
func insertIntoRecipes(db *sql.DB, exists bool, newRecipe DataItem) {
...
}
在我的代码中,我从一个API获取一些JSON数据,并得到一个在data
slice中包含大约100项的响应
然后我在数据
切片中的每个项目上循环并处理它们
例如,它看起来像这样:
type GetRecipesPaginatedResponse struct {
Total int `json:"total"`
PerPage int `json:"per_page"`
CurrentPage int `json:"current_page"`
LastPage int `json:"last_page"`
NextPageURL string `json:"next_page_url"`
PrevPageURL interface{} `json:"prev_page_url"`
From int `json:"from"`
To int `json:"to"`
Data []struct {
ID int `json:"id"`
ParentRecipeID int `json:"parent_recipe_id"`
UserID int `json:"user_id"`
Name string `json:"name"`
Description string `json:"description"`
IsActive bool `json:"is_active"`
IsPublic bool `json:"is_public"`
CreatedAt time.Time `json:"created_at"`
UpdatedAt time.Time `json:"updated_at"`
BjcpStyle struct {
SubCategoryID string `json:"sub_category_id"`
CategoryName string `json:"category_name"`
SubCategoryName string `json:"sub_category_name"`
} `json:"bjcp_style"`
UnitType struct {
ID int `json:"id"`
Name string `json:"name"`
} `json:"unit_type"`
} `json:"data"`
}
for page := 1; page < 3; page++ {
newRecipes := getFromRecipesEndpoint(page, latestTimeStamp) //this returns an instance of GetRecipesPaginatedResponse
for _, newRecipe := range newRecipes.Data {
if rowExists(db, "SELECT id from community_recipes WHERE id=@id", sql.Named("id", newRecipe.ID)) {
insertIntoRecipes(db, true, newRecipe)
} else {
insertIntoRecipes(db, false, newRecipe)
}
}
}
func insertIntoRecipes(db *sql.DB, exists bool, newRecipe GetRecipesPaginatedResponse.Data) {
if exists {
//update the existing record in the DB
//perform some other updates with the information
} else {
//insert a new record into the DB
//insert some other information using this information
}
}
func insertIntoRecipes(db *sql.DB, exists bool, newRecipe DataItem) {
...
}
当我运行此操作时,我会得到以下错误:
GetRecipesPaginatedResponse.Data未定义(GetRecipesPaginatedResponse类型没有方法数据)
我可以看出问题在于如何将newRecipe
传递给insertintocipes
函数,newRecipe getrecipes paginatedresponse.Data
,但是我不太确定如何传递它并声明正确的变量类型
若要将
数据
切片中的项目传递给函数,当我在数据
切片的每个项目上循环时,我该如何做?您不能使用字段选择器引用数据
字段的匿名类型。修复方法是为数据
字段声明命名类型:
type GetRecipesPaginatedResponse struct {
...
Data []DataItem
...
}
type DataItem struct {
ID int `json:"id"`
ParentRecipeID int `json:"parent_recipe_id"`
UserID int `json:"user_id"`
Name string `json:"name"`
...
}
像这样使用它:
type GetRecipesPaginatedResponse struct {
Total int `json:"total"`
PerPage int `json:"per_page"`
CurrentPage int `json:"current_page"`
LastPage int `json:"last_page"`
NextPageURL string `json:"next_page_url"`
PrevPageURL interface{} `json:"prev_page_url"`
From int `json:"from"`
To int `json:"to"`
Data []struct {
ID int `json:"id"`
ParentRecipeID int `json:"parent_recipe_id"`
UserID int `json:"user_id"`
Name string `json:"name"`
Description string `json:"description"`
IsActive bool `json:"is_active"`
IsPublic bool `json:"is_public"`
CreatedAt time.Time `json:"created_at"`
UpdatedAt time.Time `json:"updated_at"`
BjcpStyle struct {
SubCategoryID string `json:"sub_category_id"`
CategoryName string `json:"category_name"`
SubCategoryName string `json:"sub_category_name"`
} `json:"bjcp_style"`
UnitType struct {
ID int `json:"id"`
Name string `json:"name"`
} `json:"unit_type"`
} `json:"data"`
}
for page := 1; page < 3; page++ {
newRecipes := getFromRecipesEndpoint(page, latestTimeStamp) //this returns an instance of GetRecipesPaginatedResponse
for _, newRecipe := range newRecipes.Data {
if rowExists(db, "SELECT id from community_recipes WHERE id=@id", sql.Named("id", newRecipe.ID)) {
insertIntoRecipes(db, true, newRecipe)
} else {
insertIntoRecipes(db, false, newRecipe)
}
}
}
func insertIntoRecipes(db *sql.DB, exists bool, newRecipe GetRecipesPaginatedResponse.Data) {
if exists {
//update the existing record in the DB
//perform some other updates with the information
} else {
//insert a new record into the DB
//insert some other information using this information
}
}
func insertIntoRecipes(db *sql.DB, exists bool, newRecipe DataItem) {
...
}
对于DataItem
,可能有一个更好的名称