定义猪的模型和营养需求模型

internal/infra/models/pig_nutrient.go

@@ -0,0 +1,16 @@
+package models
+
+// PigNutrientRequirement 猪营养需求模型
+type PigNutrientRequirement struct {
+	Model
+	PigTypeID      uint32   `gorm:"not null;index;comment:关联的猪类型ID"`
+	PigType        PigType  `gorm:"foreignKey:PigTypeID"`
+	NutrientID     uint32   `gorm:"not null;index;comment:关联的营养素ID"`
+	Nutrient       Nutrient `gorm:"foreignKey:NutrientID"`
+	MinRequirement float32  `gorm:"not null;comment:最低营养需求量"`
+	MaxRequirement float32  `gorm:"not null;comment:最高营养需求量"`
+}
+
+func (PigNutrientRequirement) TableName() string {
+	return "pig_nutrient_requirements"
+}