✨ Database grouping by field https://github.com/siyuan-note/siyuan/issues/10964

kernel/av/group.go

@@ -0,0 +1,57 @@
+// SiYuan - Refactor your thinking
+// Copyright (c) 2020-present, b3log.org
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+package av
+
+// Groupable 定义了可分组的视图类型。
+type Groupable interface {
+
+	// Group 根据视图中设置的分组规则进行分组。
+	Group(attrView *AttributeView)
+}
+
+type ViewGroup struct {
+	Field  string      `json:"field"`           // 分组字段 ID
+	Method GroupMethod `json:"method"`          // 分组方式
+	Range  *GroupRange `json:"range,omitempty"` // 分组范围
+	Order  GroupOrder  `json:"order"`           // 分组顺序
+}
+
+type GroupMethod int
+
+const (
+	GroupMethodValue        GroupMethod = iota // 按值分组
+	GroupMethodRangeNum                        // 按数字范围分组
+	GroupMethodDateRelative                    // 按相对日期日期分组
+	GroupMethodDateDay                         // 按天日期分组
+	GroupMethodDateWeek                        // 按周日期分组
+	GroupMethodDateMonth                       // 按月日期分组
+	GroupMethodDateYear                        // 按年日期分组
+)
+
+// GroupRange 定义了分组范围的结构。
+type GroupRange struct {
+	NumStart float64 `json:"numStart"` // 数字范围起始值
+	NumEnd   float64 `json:"numEnd"`   // 数字范围结束值
+	NumStep  float64 `json:"numStep"`  // 数字范围步长
+}
+
+type GroupOrder string
+
+const (
+	GroupOrderAsc  GroupOrder = "ASC"
+	GroupOrderDesc GroupOrder = "DESC"
+)