feat: add mapping functions

internal/author/controller.go

@@ -1,4 +1,4 @@
-package user
+package author
 
 import (
 	"strconv"
@@ -23,7 +23,7 @@ func (u *Controller) ListAuthors(c *gin.Context) {
 		c.AbortWithError(500, err)
 		return
 	}
-	c.JSON(200, authors)
+	c.JSON(200, toAuthorSlice(authors))
 }
 
 func (u *Controller) GetAuthorByID(c *gin.Context) {
@@ -39,5 +39,5 @@ func (u *Controller) GetAuthorByID(c *gin.Context) {
 		return
 	}
 
-	c.JSON(200, author)
+	c.JSON(200, toAuthor(author))
 }

internal/author/mapper.go

@@ -0,0 +1,21 @@
+package author
+
+import "tutorial.sqlc.dev/app/internal/author/gen"
+
+func toAuthor(a gen.Author) Author {
+	return Author{
+		a.ID, a.Name, a.Bio.String,
+	}
+}
+
+func mapSlice[K any, V any](conv func(K) V) func([]K) []V {
+	return func(inputs []K) []V {
+		output := make([]V, len(inputs))
+		for i, input := range inputs {
+			output[i] = conv(input)
+		}
+		return output
+	}
+}
+
+var toAuthorSlice = mapSlice(toAuthor)

internal/author/model.go

@@ -0,0 +1,7 @@
+package author
+
+type Author struct {
+	ID   int64  `json:"id"`
+	Name string `json:"name"`
+	Bio  string `json:"bio"`
+}

internal/author/router.go

@@ -1,4 +1,4 @@
-package user
+package author
 
 import "github.com/gin-gonic/gin"