Connection

- follow GraphQL specs

model/connection.go

@@ -9,17 +9,12 @@ import (
 )
 
 type Connection[T connection.Cursor] struct {
-	Edges    []Edge[T] `json:"edges"`
+	Edges    []T       `json:"edges"`
 	PageInfo *PageInfo `json:"page_info"`
 }
 
-type Edge[T connection.Cursor] struct {
-	Node   T      `json:"node"`
-	Cursor string `json:"cursor"`
-}
-
 func (c *Connection[T]) Reverse() {
-	c.Edges = lo.Reverse[Edge[T]](c.Edges)
+	c.Edges = lo.Reverse[T](c.Edges)
 }
 
 func (c *Connection[T]) Grain(after, before *string) error {
@@ -32,8 +27,8 @@ func (c *Connection[T]) Grain(after, before *string) error {
 		return nil
 	}
 
-	edges := lo.FlatMap[Edge[T], string](c.Edges, func(item Edge[T], _ int) []string {
-		return []string{item.Cursor}
+	edges := lo.FlatMap[T, string](c.Edges, func(item T, _ int) []string {
+		return []string{item.Cursor()}
 	})
 
 	c.PageInfo = &PageInfo{
@@ -43,13 +38,13 @@ func (c *Connection[T]) Grain(after, before *string) error {
 
 	if after != nil {
 		if idx := lo.IndexOf(edges, *after); idx != -1 {
-			c.Edges = lo.Slice[Edge[T]](c.Edges, idx+1, math.MaxUint32)
+			c.Edges = lo.Slice[T](c.Edges, idx+1, math.MaxUint32)
 		}
 	}
 
 	if before != nil {
 		if idx := lo.IndexOf(edges, *before); idx != -1 {
-			c.Edges = lo.Subset[Edge[T]](c.Edges, -idx, math.MaxUint32)
+			c.Edges = lo.Subset[T](c.Edges, -idx, math.MaxUint32)
 		}
 	}
 
@@ -62,11 +57,11 @@ func (c *Connection[T]) Slice(first, last *int) error {
 	}
 
 	if first != nil {
-		c.Edges = lo.Slice[Edge[T]](c.Edges, 0, *first)
+		c.Edges = lo.Slice[T](c.Edges, 0, *first)
 	}
 
 	if last != nil {
-		c.Edges = lo.Subset[Edge[T]](c.Edges, -*last, math.MaxUint32)
+		c.Edges = lo.Subset[T](c.Edges, -*last, math.MaxUint32)
 	}
 
 	if len(c.Edges) < 1 {
@@ -75,10 +70,10 @@ func (c *Connection[T]) Slice(first, last *int) error {
 		c.PageInfo.StartCursor = nil
 		c.PageInfo.EndCursor = nil
 	} else {
-		c.PageInfo.HasPreviousPage = !(*c.PageInfo.StartCursor == c.Edges[0].Cursor)
-		c.PageInfo.HasNextPage = !(*c.PageInfo.EndCursor == c.Edges[len(c.Edges)-1].Cursor)
-		c.PageInfo.StartCursor = lo.ToPtr(c.Edges[0].Cursor)
-		c.PageInfo.EndCursor = lo.ToPtr(c.Edges[len(c.Edges)-1].Cursor)
+		c.PageInfo.HasPreviousPage = !(*c.PageInfo.StartCursor == c.Edges[0].Cursor())
+		c.PageInfo.HasNextPage = !(*c.PageInfo.EndCursor == c.Edges[len(c.Edges)-1].Cursor())
+		c.PageInfo.StartCursor = lo.ToPtr(c.Edges[0].Cursor())
+		c.PageInfo.EndCursor = lo.ToPtr(c.Edges[len(c.Edges)-1].Cursor())
 	}
 
 	return nil
@@ -93,6 +88,6 @@ func (c *Connection[T]) Unmarshal(data []byte) error {
 }
 
 func (c Connection[T]) Key() string {
-	var zero T
+	var zero []T
 	return fmt.Sprintf("connection-edges-%T", zero)
 }