实现GetPlan

internal/app/controller/plan/plan_controller.go

@@ -1,11 +1,15 @@
 package plan
 
 import (
+	"errors"
+	"strconv"
+
 	"git.huangwc.com/pig/pig-farm-controller/internal/app/controller"
 	"git.huangwc.com/pig/pig-farm-controller/internal/infra/logs"
 	"git.huangwc.com/pig/pig-farm-controller/internal/infra/models"
 	"git.huangwc.com/pig/pig-farm-controller/internal/infra/repository"
 	"github.com/gin-gonic/gin"
+	"gorm.io/gorm"
 )
 
 // --- 请求和响应 DTO 定义 ---
@@ -143,11 +147,34 @@ func (c *Controller) CreatePlan(ctx *gin.Context) {
 // @Success      200 {object} controller.Response{data=plan.PlanResponse} "业务码为200代表成功获取"
 // @Failure      200 {object} controller.Response "业务失败，具体错误码和信息见响应体（例如400, 404, 500）"
 // @Router       /plans/{id} [get]
-func (pc *Controller) GetPlan(c *gin.Context) {
-	// 占位符：此处应调用服务层或仓库层来获取计划
-	pc.logger.Infof("收到获取计划 (占位符)")
-	controller.SendResponse(c, controller.CodeSuccess, "获取计划接口占位符", ListPlansResponse{Plans: []PlanResponse{}, Total: 0})
+func (c *Controller) GetPlan(ctx *gin.Context) {
+	// 1. 从 URL 路径中获取 ID
+	idStr := ctx.Param("id")
+	id, err := strconv.ParseUint(idStr, 10, 32)
+	if err != nil {
+		controller.SendErrorResponse(ctx, controller.CodeBadRequest, "无效的计划ID格式")
+		return
+	}
 
+	// 2. 调用仓库层获取计划详情
+	plan, err := c.planRepo.GetPlanByID(uint(id))
+	if err != nil {
+		// 判断是否为“未找到”错误
+		if errors.Is(err, gorm.ErrRecordNotFound) {
+			controller.SendErrorResponse(ctx, controller.CodeNotFound, "计划不存在")
+			return
+		}
+		// 其他数据库错误视为内部错误
+		c.logger.Errorf("获取计划详情失败: %v", err)
+		controller.SendErrorResponse(ctx, controller.CodeInternalError, "获取计划详情时发生内部错误")
+		return
+	}
+
+	// 3. 将模型转换为响应 DTO
+	resp := PlanToResponse(plan)
+
+	// 4. 发送成功响应
+	controller.SendResponse(ctx, controller.CodeSuccess, "获取计划详情成功", resp)
 }
 
 // ListPlans godoc