Pass error to svelte using a struct

...a very cursed struct

app.go

@@ -20,6 +20,10 @@ func (a *App) startup(ctx context.Context) {
 	a.ctx = ctx
 }
 
-func (a *App) GetFood() ([]Food, error) {
-	return foodService.GetRecent()
+func (a *App) GetFood() WailsFood {
+	data, err := foodService.GetRecent()
+	if err != nil {
+		return WailsFood{Success: false, Error: err.Error()}
+	}
+	return WailsFood{Data: data, Success: true}
 }

frontend/src/App.svelte

@@ -1,9 +1,6 @@
 <script lang="ts">
 	import Header from "$lib/components/Header.svelte";
 	import Router from "$lib/router/Router.svelte";
-	import { GetFood } from "../wailsjs/go/main/App.js";
-
-	GetFood().then((result) => console.log(result));
 </script>
 
 <template>

frontend/src/lib/components/Energy/Energy.svelte

@@ -0,0 +1,20 @@
+<script lang="ts">
+	import { GetFood } from "$wails/main/App.js";
+	import { main } from '$wails/models'
+
+	let food: main.Food[] = [];
+	GetFood().then((result) => {
+		if (!result.success) {
+			console.error(result.error);
+			return;
+		}
+		food = result.data
+		console.log(food);
+	});
+</script>
+
+<template>
+	{#each food as f}
+		<div>{f.food}</div>
+	{/each}
+</template>

frontend/wailsjs/go/main/App.d.ts

@@ -2,4 +2,4 @@
 // This file is automatically generated. DO NOT EDIT
 import {main} from '../models';
 
-export function GetFood():Promise<Array<main.Food>>;
+export function GetFood():Promise<main.WailsFood>;

frontend/wailsjs/go/models.ts

@@ -1,7 +1,13 @@
 export namespace main {
 	
 	export class Food {
-	
+	    rowid: number;
+	    date: string;
+	    food: string;
+	    description: string;
+	    amount: number;
+	    per100: number;
+	    energy: number;
 	
 	    static createFrom(source: any = {}) {
 	        return new Food(source);
@@ -9,7 +15,47 @@ export namespace main {
 	
 	    constructor(source: any = {}) {
 	        if ('string' === typeof source) source = JSON.parse(source);
+	        this.rowid = source["rowid"];
+	        this.date = source["date"];
+	        this.food = source["food"];
+	        this.description = source["description"];
+	        this.amount = source["amount"];
+	        this.per100 = source["per100"];
+	        this.energy = source["energy"];
+	    }
+	}
+	export class WailsFood {
+	    data: Food[];
+	    success: boolean;
+	    error?: string;
 	
+	    static createFrom(source: any = {}) {
+	        return new WailsFood(source);
+	    }
+	
+	    constructor(source: any = {}) {
+	        if ('string' === typeof source) source = JSON.parse(source);
+	        this.data = this.convertValues(source["data"], Food);
+	        this.success = source["success"];
+	        this.error = source["error"];
+	    }
+	
+		convertValues(a: any, classs: any, asMap: boolean = false): any {
+		    if (!a) {
+		        return a;
+		    }
+		    if (a.slice && a.map) {
+		        return (a as any[]).map(elem => this.convertValues(elem, classs));
+		    } else if ("object" === typeof a) {
+		        if (asMap) {
+		            for (const key of Object.keys(a)) {
+		                a[key] = new classs(a[key]);
+		            }
+		            return a;
+		        }
+		        return new classs(a);
+		    }
+		    return a;
 		}
 	}
 

types.go

@@ -1,16 +0,0 @@
-package main
-
-import "time"
-
-type (
-
-	Weight struct {
-		rowid  int
-		date   time.Time
-		weight float32
-	}
-	AggregatedWeight struct {
-		period string
-		amount float32
-	}
-)

wailstypes.go

@@ -0,0 +1,33 @@
+package main
+
+import "time"
+
+type (
+	// Wails doesn't rlike generics... Fuck...
+	// WailsReturn[T interface{}] struct {
+	// 	Data    T      `json:'data'`
+	// 	Success bool   `json:'success'`
+	// 	Error   string `json:'error'`
+	// }
+
+	WailsFood struct {
+		Data    []Food `json:"data"`
+		Success bool   `json:"success"`
+		Error   string `json:"error,omitempty"`
+	}
+	WailsAggregateFood struct {
+		Data    []AggregatedFood `json:"data"`
+		Success bool             `json:"success"`
+		Error   string           `json:"error,omitempty"`
+	}
+
+	Weight struct {
+		rowid  int
+		date   time.Time
+		weight float32
+	}
+	AggregatedWeight struct {
+		period string
+		amount float32
+	}
+)