feat: implement memo relation store (#1598)

* feat: implement memo relation store

* chore: update

test/store/memo_relation_test.go

@@ -0,0 +1,57 @@
+package teststore
+
+import (
+	"context"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+	"github.com/usememos/memos/api"
+	"github.com/usememos/memos/store"
+)
+
+func TestMemoRelationStore(t *testing.T) {
+	ctx := context.Background()
+	ts := NewTestingStore(ctx, t)
+	user, err := createTestingHostUser(ctx, ts)
+	require.NoError(t, err)
+	memoCreate := &api.MemoCreate{
+		CreatorID:  user.ID,
+		Content:    "test_content",
+		Visibility: api.Public,
+	}
+	memo, err := ts.CreateMemo(ctx, memoCreate)
+	require.NoError(t, err)
+	require.Equal(t, memoCreate.Content, memo.Content)
+	memoCreate = &api.MemoCreate{
+		CreatorID:  user.ID,
+		Content:    "test_content_2",
+		Visibility: api.Public,
+	}
+	memo2, err := ts.CreateMemo(ctx, memoCreate)
+	require.NoError(t, err)
+	require.Equal(t, memoCreate.Content, memo2.Content)
+	memoRelationMessage := &store.MemoRelationMessage{
+		MemoID:        memo.ID,
+		RelatedMemoID: memo2.ID,
+		Type:          store.MemoRelationReference,
+	}
+	_, err = ts.UpsertMemoRelation(ctx, memoRelationMessage)
+	require.NoError(t, err)
+	memoRelation, err := ts.ListMemoRelations(ctx, &store.FindMemoRelationMessage{
+		MemoID: &memo.ID,
+	})
+	require.NoError(t, err)
+	require.Equal(t, 1, len(memoRelation))
+	require.Equal(t, memo2.ID, memoRelation[0].RelatedMemoID)
+	require.Equal(t, memo.ID, memoRelation[0].MemoID)
+	require.Equal(t, store.MemoRelationReference, memoRelation[0].Type)
+	err = ts.DeleteMemo(ctx, &api.MemoDelete{
+		ID: memo2.ID,
+	})
+	require.NoError(t, err)
+	memoRelation, err = ts.ListMemoRelations(ctx, &store.FindMemoRelationMessage{
+		MemoID: &memo.ID,
+	})
+	require.NoError(t, err)
+	require.Equal(t, 0, len(memoRelation))
+}