feat(admin): edit category content in the admin form behind the HTML gate

- add a content textarea (size huge) after description, with en and pl phrases
- add content to Category.Fillable
- export classes.CheckHTML and run it from FormBeforeCreate and FormBeforeUpdate:
  unsafe category content answers 422 on content, blank content is stored as NULL

models/category.go

@@ -29,7 +29,7 @@ func (Category) TranslatableIndexes() []string { return []string{"slug"} }
 
 // Fillable is JOURNAL-002: nest_* stay out of mass assignment.
 func (Category) Fillable() []string {
-	return []string{"name", "slug", "code", "description", "parent_id"}
+	return []string{"name", "slug", "code", "description", "content", "parent_id"}
 }
 
 func (Category) Rules() map[string]string {

models/category/fields.yaml

@@ -22,3 +22,9 @@ fields:
         type: mltextarea
         size: large
         span: full
+    content:
+        label: golem15.journal::lang.category.content
+        comment: golem15.journal::lang.category.content_comment
+        type: textarea
+        size: huge
+        span: full

models/fillable_test.go

@@ -39,7 +39,7 @@ func TestFillable(t *testing.T) {
 	})
 
 	t.Run("category_excludes_nest", func(t *testing.T) {
-		if got := (models.Category{}).Fillable(); !reflect.DeepEqual(got, []string{"name", "slug", "code", "description", "parent_id"}) {
+		if got := (models.Category{}).Fillable(); !reflect.DeepEqual(got, []string{"name", "slug", "code", "description", "content", "parent_id"}) {
 			t.Fatalf("Category.Fillable = %#v", got)
 		}
 		left := 3
@@ -48,6 +48,7 @@ func TestFillable(t *testing.T) {
 			"name":       "Essays",
 			"slug":       "essays",
 			"code":       "ess",
+			"content":    "<p>Essay hub</p>",
 			"nest_left":  9,
 			"nest_right": 10,
 			"nest_depth": 2,
@@ -58,6 +59,9 @@ func TestFillable(t *testing.T) {
 		if cat.Name != "Essays" || cat.Slug != "essays" {
 			t.Fatalf("category fill = %+v", cat)
 		}
+		if cat.Content == nil || *cat.Content != "<p>Essay hub</p>" {
+			t.Fatalf("category content fill = %#v", cat.Content)
+		}
 		if cat.ID != 0 {
 			t.Fatalf("id was mass-assigned: %d", cat.ID)
 		}