feat: implement relation management system with controllers, services, repositories, and corresponding API documentation.

internal/controllers/relationController.go

@@ -0,0 +1,57 @@
+package controllers
+
+import (
+	"context"
+	"history-api/internal/dtos/request"
+	"history-api/internal/dtos/response"
+	"history-api/internal/services"
+	"history-api/pkg/validator"
+	"time"
+
+	"github.com/gofiber/fiber/v3"
+)
+
+type RelationController struct {
+	service services.RelationService
+}
+
+func NewRelationController(svc services.RelationService) *RelationController {
+	return &RelationController{service: svc}
+}
+
+// GetRelations handles fetching relationships dynamically.
+// @Summary      Get generalized batch relations
+// @Description  Get relations by type (wiki-entity, entity-wiki, geometry-entity, entity-geometry) and list of IDs
+// @Tags         Relations
+// @Accept       json
+// @Produce      json
+// @Param query query request.GetRelationsDto true "Query Parameters"
+// @Success      200  {object}  response.CommonResponse
+// @Failure      400  {object}  response.CommonResponse
+// @Failure      500  {object}  response.CommonResponse
+// @Router       /relations [get]
+func (h *RelationController) GetRelations(c fiber.Ctx) error {
+	ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
+	defer cancel()
+
+	dto := &request.GetRelationsDto{}
+	if err := validator.ValidateQueryDto(c, dto); err != nil {
+		return c.Status(fiber.StatusBadRequest).JSON(response.CommonResponse{
+			Status: false,
+			Errors: err,
+		})
+	}
+
+	res, err := h.service.GetRelations(ctx, dto)
+	if err != nil {
+		return c.Status(err.Code).JSON(response.CommonResponse{
+			Status:  false,
+			Message: err.Message,
+		})
+	}
+
+	return c.Status(fiber.StatusOK).JSON(response.CommonResponse{
+		Status: true,
+		Data:   res,
+	})
+}