[wip] joins

Signed-off-by: Anton Nesterov <anton@demiurg.io>

pkg/dal/convert.go

@@ -1,19 +0,0 @@
-package dal
-
-import (
-	"strings"
-
-	filters "l12.xyz/dal/filters"
-)
-
-func CovertFind(find Find, ctx Context) string {
-	expressions := []string{}
-	for key, value := range find {
-		context := ctx.New(CtxOpts{
-			"FieldName": key,
-		})
-		values, _ := filters.Convert(context, value)
-		expressions = append(expressions, values)
-	}
-	return strings.Join(expressions, " AND ")
-}

pkg/dal/convert_find.go

@@ -0,0 +1,37 @@
+package dal
+
+import (
+	"fmt"
+	"strings"
+
+	filters "l12.xyz/dal/filters"
+)
+
+func CovertFind(find Find, ctx Context) string {
+	return covert_find(find, ctx, "")
+}
+
+func covert_find(find Find, ctx Context, join string) string {
+	if join == "" {
+		join = " AND "
+	}
+	expressions := []string{}
+	for key, value := range find {
+		if strings.Contains(key, "$and") {
+			v := covert_find(value.(Find), ctx, "")
+			expressions = append(expressions, fmt.Sprintf("(%s)", v))
+			continue
+		}
+		if strings.Contains(key, "$or") {
+			v := covert_find(value.(Find), ctx, " OR ")
+			expressions = append(expressions, fmt.Sprintf("(%s)", v))
+			continue
+		}
+		context := ctx.New(CtxOpts{
+			"FieldName": key,
+		})
+		values, _ := filters.Convert(context, value)
+		expressions = append(expressions, values)
+	}
+	return strings.Join(expressions, join)
+}

pkg/dal/convert_find_test.go

@@ -0,0 +1,75 @@
+package dal
+
+import (
+	"testing"
+
+	f "l12.xyz/dal/filters"
+)
+
+func TestConvertFind(t *testing.T) {
+	find := Find{
+		"impl": "1",
+		"exp": Is{
+			"$gt": 1,
+		},
+	}
+	ctx := f.SQLiteContext{
+		TableAlias: "t",
+	}
+	result := CovertFind(find, ctx)
+	if result == `t.exp > 1 AND t.impl = '1'` {
+		return
+	}
+	if result == `t.impl = '1' AND t.exp > 1` {
+		return
+	}
+	t.Errorf(`Expected "t.impl = '1' AND t.exp = 1", got %s`, result)
+}
+
+func TestConvertFindAnd(t *testing.T) {
+	find := Find{
+		"$and": Find{
+			"a": Is{
+				"$gt": 1,
+			},
+			"b": Is{
+				"$lt": 10,
+			},
+		},
+	}
+	ctx := f.SQLiteContext{
+		TableAlias: "t",
+	}
+	result := CovertFind(find, ctx)
+	if result == `(t.a > 1 AND t.b < 10)` {
+		return
+	}
+	if result == `(t.b < 10 AND t.a > 1)` {
+		return
+	}
+	t.Errorf(`Expected "(t.b < 10 AND t.a > 1)", got %s`, result)
+}
+
+func TestConvertFindOr(t *testing.T) {
+	find := Query{
+		"$or": Query{
+			"a": Is{
+				"$gt": 1,
+			},
+			"b": Is{
+				"$lt": 10,
+			},
+		},
+	}
+	ctx := f.SQLiteContext{
+		TableAlias: "t",
+	}
+	result := CovertFind(find, ctx)
+	if result == `(t.a > 1 OR t.b < 10)` {
+		return
+	}
+	if result == `(t.b < 10 OR t.a > 1)` {
+		return
+	}
+	t.Errorf(`Expected "(t.b < 10 OR t.a > 1)", got %s`, result)
+}

pkg/dal/convert_join.go

@@ -0,0 +1,17 @@
+package dal
+
+import "fmt"
+
+type Join struct {
+	For string `json:"$for"`
+	Do  Find   `json:"$do"`
+	As  string `json:"$as"`
+}
+
+func (j Join) Convert(ctx Context) string {
+	if j.For == "" {
+		return ""
+	}
+	filter := CovertFind(j.Do, ctx)
+	return fmt.Sprintf("%s JOIN %s ON %s", j.As, j.For, filter)
+}

pkg/dal/convert_join_test.go

@@ -0,0 +1,25 @@
+package dal
+
+import (
+	"testing"
+
+	f "l12.xyz/dal/filters"
+)
+
+func TestJoin(t *testing.T) {
+	j := Join{
+		For: "artist a",
+		Do: Find{
+			"a.impl": "t.impl",
+		},
+		As: "LEFT",
+	}
+	ctx := f.SQLiteContext{
+		TableAlias: "t",
+	}
+	result := j.Convert(ctx)
+	if result == `LEFT JOIN artist a ON a.impl = t.impl` {
+		return
+	}
+	t.Errorf(`Expected "LEFT JOIN artist a ON a.impl = t.impl", got %s`, result)
+}

pkg/dal/convert_test.go

@@ -1,24 +0,0 @@
-package dal
-
-import (
-	"testing"
-
-	f "l12.xyz/dal/filters"
-)
-
-func TestConvertFind(t *testing.T) {
-	find := Find{
-		"test":  "1",
-		"test2": "2",
-		"test3": Filter{
-			"$ne": 1,
-		},
-	}
-	ctx := f.SQLiteContext{
-		TableAlias: "t",
-	}
-	result := CovertFind(find, ctx)
-	if result != `t.test = '1'` {
-		t.Errorf("Expected t.test = '1', got %s", result)
-	}
-}

pkg/dal/types.go

@@ -5,6 +5,8 @@ import (
 )
 
 type Find = filters.Find
+type Query = filters.Find
 type Filter = filters.Filter
+type Is = filters.Filter
 type Context = filters.Context
 type CtxOpts = filters.CtxOpts

pkg/filters/registry.go

@@ -23,9 +23,9 @@ var FilterRegistry = map[string]IFilter{
 }
 
 func Convert(ctx Context, data interface{}) (string, error) {
-	for _, t := range FilterRegistry {
-		filter := t.FromJSON(data)
-		if reflect.DeepEqual(t, filter) {
+	for _, impl := range FilterRegistry {
+		filter := impl.FromJSON(data)
+		if reflect.DeepEqual(impl, filter) {
 			continue
 		}
 		value := filter.ToSQLPart(ctx)