Sharing data with templates: correct import cycle

pkg/handlers/handlers.go

@@ -2,22 +2,11 @@ package handlers
 
 import (
 	"go-udemy-web-1/pkg/config"
+	"go-udemy-web-1/pkg/models"
 	"go-udemy-web-1/pkg/render"
 	"net/http"
 )
 
-// TemplateData holds data sent from handlers to templates
-type TemplateData struct {
-	StringMap map[string]string
-	IntMap    map[string]int
-	FloatMap  map[string]float32
-	Data      map[string]interface{}
-	CSRFToken string
-	Flash     string
-	Warning   string
-	Error     string
-}
-
 // Repo the repository used by the handlers
 var Repo *Repository
 
@@ -40,7 +29,7 @@ func NewHandlers(r *Repository) {
 
 // Home is the about page handler
 func (m *Repository) Home(w http.ResponseWriter, r *http.Request) {
-	render.RenderTemplate(w, "home.page.tmpl", &TemplateData{})
+	render.RenderTemplate(w, "home.page.tmpl", &models.TemplateData{})
 }
 
 // About is the about page handler
@@ -49,5 +38,5 @@ func (m *Repository) About(w http.ResponseWriter, r *http.Request) {
 	stringMap := make(map[string]string)
 	stringMap["test"] = "Hello world!"
 	// send the data to the template
-	render.RenderTemplate(w, "about.page.tmpl", &TemplateData{StringMap: stringMap})
+	render.RenderTemplate(w, "about.page.tmpl", &models.TemplateData{StringMap: stringMap})
 }

pkg/models/templatedata.go

@@ -0,0 +1,13 @@
+package models
+
+// TemplateData holds data sent from handlers to templates
+type TemplateData struct {
+	StringMap map[string]string
+	IntMap    map[string]int
+	FloatMap  map[string]float32
+	Data      map[string]interface{}
+	CSRFToken string
+	Flash     string
+	Warning   string
+	Error     string
+}

pkg/render/render.go

@@ -3,7 +3,7 @@ package render
 import (
 	"bytes"
 	"go-udemy-web-1/pkg/config"
-	"go-udemy-web-1/pkg/handlers"
+	"go-udemy-web-1/pkg/models"
 	"html/template"
 	"log"
 	"net/http"
@@ -17,8 +17,13 @@ func NewTemplates(a *config.AppConfig) {
 	app = a
 }
 
+// AddDefaultData adds default template data
+func AddDefaultData(td *models.TemplateData) *models.TemplateData {
+	return td
+}
+
 // RenderTemplate renders a HTML template file
-func RenderTemplate(w http.ResponseWriter, tmpl string, td *handlers.TemplateData) {
+func RenderTemplate(w http.ResponseWriter, tmpl string, td *models.TemplateData) {
 	var tc map[string]*template.Template
 	if app.UseCache {
 		// get the template cache from the app config
@@ -36,7 +41,10 @@ func RenderTemplate(w http.ResponseWriter, tmpl string, td *handlers.TemplateDat
 	// Write to a buffer to make sure that the template can be read and
 	// written successfully
 	buf := new(bytes.Buffer)
-	err := t.Execute(buf, nil)
+
+	td = AddDefaultData(td)
+
+	err := t.Execute(buf, td)
 	if err != nil {
 		log.Println(err)
 	}