属于关联 Golang Gorm 未找到具有显式 ForeignKey
Belongs To Association Golang Gorm not being found with explicit ForeignKey
我有一个这样的交易结构:
type Trade struct {
ID uint
BuyExecution Execution `gorm:"ForeignKey:BuyExecution"`
SellExecution Execution `gorm:"ForeignKey:SellExecution"`
Px int
Shares int
}
还有一个像这样的执行结构:
type Execution struct {
ID uint
Side string
Symbol string
Trade *Trade
}
架构:
CREATE TABLE `executions` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`side` varchar(255) COLLATE utf8_unicode_ci DEFAULT NULL,
`symbol` varchar(255) COLLATE utf8_unicode_ci DEFAULT NULL,
`trade_id` varchar(255) COLLATE utf8_unicode_ci DEFAULT NULL,
PRIMARY KEY (`id`),
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci;
CREATE TABLE `trades` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`buy_execution_id` int(11) NOT NULL,
`sell_execution_id` int(11) NOT NULL,
`px` int(11) NOT NULL,
`shares` int(11) NOT NULL,
`trade_id` varchar(255) COLLATE utf8_unicode_ci NOT NULL,
PRIMARY KEY (`id`),
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci;
但是,当创建执行然后从具有适当关系的 yaml 固定装置进行交易时,我收到一个错误:
[2016-06-28 21:17:50] sql: converting Exec argument #0's type: unsupported type models.Execution, a struct
指向我在此处进行的 Preload
调用:
var trade Trade
db.Preload("BuyExecution").First(&trade)
调试这个很困难,所以试图获得一些帮助。
像这样定义您的 Trade
结构
type Trade struct {
ID uint
BuyExecution Execution `gorm:"ForeignKey:BuyExecutionID"`
BuyExecutionID int
SellExecution Execution `gorm:"ForeignKey:SellExecutionID"`
SellExecutionID int
Px int
Shares int
}
甚至
type Trade struct {
ID uint
BuyExecution Execution
BuyExecutionID int
SellExecution Execution
SellExecutionID int
Px int
Shares int
}
我有一个这样的交易结构:
type Trade struct {
ID uint
BuyExecution Execution `gorm:"ForeignKey:BuyExecution"`
SellExecution Execution `gorm:"ForeignKey:SellExecution"`
Px int
Shares int
}
还有一个像这样的执行结构:
type Execution struct {
ID uint
Side string
Symbol string
Trade *Trade
}
架构:
CREATE TABLE `executions` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`side` varchar(255) COLLATE utf8_unicode_ci DEFAULT NULL,
`symbol` varchar(255) COLLATE utf8_unicode_ci DEFAULT NULL,
`trade_id` varchar(255) COLLATE utf8_unicode_ci DEFAULT NULL,
PRIMARY KEY (`id`),
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci;
CREATE TABLE `trades` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`buy_execution_id` int(11) NOT NULL,
`sell_execution_id` int(11) NOT NULL,
`px` int(11) NOT NULL,
`shares` int(11) NOT NULL,
`trade_id` varchar(255) COLLATE utf8_unicode_ci NOT NULL,
PRIMARY KEY (`id`),
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci;
但是,当创建执行然后从具有适当关系的 yaml 固定装置进行交易时,我收到一个错误:
[2016-06-28 21:17:50] sql: converting Exec argument #0's type: unsupported type models.Execution, a struct
指向我在此处进行的 Preload
调用:
var trade Trade
db.Preload("BuyExecution").First(&trade)
调试这个很困难,所以试图获得一些帮助。
像这样定义您的 Trade
结构
type Trade struct {
ID uint
BuyExecution Execution `gorm:"ForeignKey:BuyExecutionID"`
BuyExecutionID int
SellExecution Execution `gorm:"ForeignKey:SellExecutionID"`
SellExecutionID int
Px int
Shares int
}
甚至
type Trade struct {
ID uint
BuyExecution Execution
BuyExecutionID int
SellExecution Execution
SellExecutionID int
Px int
Shares int
}