[英]go-pg - pg: can't find dst value for model id=“,”
正在獲取pg: can't find dst value for model id=","
我定義了以下模型
// omitting fields which don't seem relevant to the issue
// corresponding queries also shortened as appropriate
type GrProduct struct {
tableName struct{} `sql:"gr_product"`
ID int64
Name string
// fk:Product,joinFK:Category given so that joins are made on category_id and product_id with gr_product_category_mapping
Categories []*GrCategory `pg:",many2many:gr_product_category_mapping,fk:Product,joinFK:Category"`
CategoryMappings []*GrProductCategoryMapping `pg:",fk:Product"`
}
type GrProductCategoryMapping struct {
tableName struct{} `sql:"gr_product_category_mapping"`
ID int64
ProductID int64 // product_id in db instead of gr_product_id
CategoryID int // category id in db instead of gr_category_id
IsPrimary bool
}
type GrCategory struct {
tableName struct{} `sql:"gr_category"`
ID int
Name string
Products []*GrProduct `pg:",many2many:gr_product_category_mapping,fk:Category,joinFK:Product"`
}
在嘗試這個-
p := models.GrProduct{}
if err := models.DB.Model(&p).
Column("Categories").
Where("id = ?", 10).
Select(); err != nil {
panic(err)
}
這些是進行的查詢
SELECT
"gr_product"."id",
"gr_product"."name"
FROM
gr_product AS "gr_product"
WHERE
(
id= 10
);
SELECT
gr_product_category_mapping.*,
"gr_category"."id",
"gr_category"."name"
FROM
gr_category AS "gr_category"
JOIN
gr_product_category_mapping AS gr_product_category_mapping
ON (
gr_product_category_mapping."product_id"
) IN (
(
10
)
)
WHERE
(
"gr_category"."id" = gr_product_category_mapping."category_id"
);
我感到panic: pg: can't find dst value for model id=","
我認為在https://github.com/go-pg/pg/blob/master/orm/model_table_m2m.go#L53行上panic: pg: can't find dst value for model id=","
。 在嘗試深入研究時,我發現' m.baseTable.ModelName+"_"
計算結果為gr_product_
,但可能應該是product_
,因為columns
包含
map[string]string [
"product_id": "10",
"category_id": "48",
"is_primary": "t",
]
我還無法弄清楚如何重寫此默認行為(Golang和go-pg均是新手),將不勝感激,謝謝
您應該能夠使用sql
標記覆蓋默認列名稱。
type GrProductCategoryMapping struct {
tableName struct{} `sql:"gr_product_category_mapping"`
ID int64
ProductID int64 `sql:"product_id"`
CategoryID int `sql:"category_id"`
IsPrimary bool
}
在這里閱讀更多。
這是v6.4.6中修復的錯誤。 這是相關的問題-https://github.com/go-pg/pg/issues/583
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