cas_tt_cloud_backend/app/api/website/model/activity_instance.go

package model

import (
	"SciencesServer/app/common/model"
	"SciencesServer/serve/orm"
	"fmt"
)

// ActivityInstance 活动信息数据
type ActivityInstance struct {
	*model.ActivityInstance
}

type (
	// ActivityInstanceInfo 活动信息
	ActivityInstanceInfo struct {
		model.Model
		model.Image
		*model.ActivityInstanceBasic
		JoinID    uint64 `json:"-"`
		JoinCount int    `json:"join_count"`
	}
	// ActivityInstanceDetail 活动详细信息
	ActivityInstanceDetail struct {
		*model.ActivityInstance
		JoinID    uint64 `json:"-"`
		JoinCount int    `json:"join_count"`
	}
)

// Activity 活动信息
func (m *ActivityInstance) Activity(uid uint64, identity, page, pageSize int, count *int64, where ...*model.ModelWhere) ([]*ActivityInstanceInfo, error) {
	mActivityJoin := model.NewActivityJoin()

	db := orm.GetDB().Table(m.TableName()+" AS a").
		Select("a.id", "a.title", "a.image", "a.begin_at", "a.finish_at", "a.join_deadline",
			"IFNULL(u.id, 0) AS join_id", "j.count AS join_count").
		Joins(fmt.Sprintf("LEFT JOIN %s u ON a.id = u.activity_id AND u.uid = %d AND u.identity = %d AND u.status = %d AND u.is_deleted = %d",
			mActivityJoin.TableName(), uid, identity, model.ActivityJoinStatusForSuccess, model.DeleteStatusForNot)).
		Joins(fmt.Sprintf("LEFT JOIN (SELECT activity_id, COUNT(id) AS count FROM %s WHERE status = %d AND is_deleted = %d GROUP BY activity_id) AS j ON a.id = j.activity_id",
			mActivityJoin.TableName(), model.ActivityJoinStatusForSuccess, model.DeleteStatusForNot)).
		Where("a.status = ?", model.ActivityInstanceStatusForShow).
		Where("a.is_deleted = ?", model.DeleteStatusForNot)

	if len(where) > 0 {
		for _, v := range where {
			db = db.Where(v.Condition, v.Value)
		}
	}
	out := make([]*ActivityInstanceInfo, 0)

	if err := db.Count(count).Error; err != nil {
		return nil, err
	}
	if err := db.Order("a.id " + model.OrderModeToDesc).Offset((page - 1) * pageSize).Limit(pageSize).Scan(&out).Error; err != nil {
		return nil, err
	}
	return out, nil
}

// Detail 详细信息
func (m *ActivityInstance) Detail(id, uid uint64, identity int) (*ActivityInstanceDetail, error) {
	mActivityJoin := model.NewActivityJoin()

	db := orm.GetDB().Table(m.TableName()+" AS a").
		Select("a.*", "IFNULL(u.id, 0) AS join_id", "j.count AS join_count").
		Joins(fmt.Sprintf("LEFT JOIN %s u ON a.id = u.activity_id AND u.uid = %d AND u.identity = %d AND u.status = %d AND u.is_deleted = %d",
			mActivityJoin.TableName(), uid, identity, model.ActivityJoinStatusForSuccess, model.DeleteStatusForNot)).
		Joins(fmt.Sprintf("LEFT JOIN (SELECT activity_id, COUNT(id) AS count FROM %s WHERE status = %d AND is_deleted = %d GROUP BY activity_id) AS j ON a.id = j.activity_id",
			mActivityJoin.TableName(), model.ActivityJoinStatusForSuccess, model.DeleteStatusForNot)).
		Where("a.id = ?", id)

	out := new(ActivityInstanceDetail)

	err := db.Scan(&out).Error

	return out, err
}

func NewActivityInstance() *ActivityInstance {
	return &ActivityInstance{model.NewActivityInstance()}
}