从今天开始（以前给定的代码运行得很好），我遇到了这个问题，我无法在刀片中获得类别模型的 title 。
blade.php
@foreach($subcategories as $subcategory)
{{ $subcategory->category->title }}
@endforeach
Category.php
public function subCategories()
{
return $this->hasMany(SubCategory::class);
}
protected $table = 'sub_categories';
SubCategory.php
public function category()
{
return $this->belongsTo(Category::class);
}
我得到的错误是
"Trying to get property 'title' of non-object
响应为 json
{
"data": {
"id": 3,
"title": "Paint",
"category_id": "1",
"active": "1"
}
}
响应迅速加载
{
"id": 3,
"title": "Paint",
"category_id": "1",
"active": "1",
"created_at": "2019-01-24 06:48:39.697",
"updated_at": "2019-01-24 06:48:39.697",
"category": {
"id": 1,
"title": "Chemical",
"active": "1",
"created_at": "2019-01-24 06:48:38.533",
"updated_at": "2019-01-29 05:41:14.597"
}
},
[更新] 当我仅使用{{$ subcategory-> category}}时，我得到了类别；
{"id":1,"title":"Chemical","active":"1","created_at":"2019-01-24 06:48:38.533","updated_at":"2019-01-29 05:41:14.597"}
清除以下内容；
cache：clear
config：clear
route：clear
作曲家更新
composer dumpautoload
浏览器缓存已清除
仍然无法正常工作
感谢的帮助
答案 0 :(得分：0)
你可以试试这个吗？
/root/shiba/BustabitClient.js:35
@param {string} uname
^
SyntaxError: Invalid or unexpected token
at new Script (vm.js:84:7)
at createScript (vm.js:264:10)
at Object.runInThisContext (vm.js:312:10)
at Module._compile (internal/modules/cjs/loader.js:696:28)
at Object.Module._extensions..js (internal/modules/cjs/loader.js:747:10)
at Module.load (internal/modules/cjs/loader.js:628:32)
at tryModuleLoad (internal/modules/cjs/loader.js:568:12)
at Function.Module._load (internal/modules/cjs/loader.js:560:3)
at Module.require (internal/modules/cjs/loader.js:665:17)
at require (internal/modules/cjs/helpers.js:20:18)
at Object.<anonymous> (/root/shiba/Shiba.js:12:25)
at Module._compile (internal/modules/cjs/loader.js:736:30)
at Object.Module._extensions..js (internal/modules/cjs/loader.js:747:10)
at Module.load (internal/modules/cjs/loader.js:628:32)
at tryModuleLoad (internal/modules/cjs/loader.js:568:12)
at Function.Module._load (internal/modules/cjs/loader.js:560:3)
at Function.Module.runMain (internal/modules/cjs/loader.js:801:12)
at executeUserCode (internal/bootstrap/node.js:526:15)
at startMainThreadExecution (internal/bootstrap/node.js:439:3)
OR
如果它不起作用，请更改您与字段名称的关系。
/////类别
const EventEmitter = require("events")
const PowerClient = require("power-client")
const debug = require("debug")("shiba:client")
const debugchat = require("debug")("shiba:chat")
const debuggame = require("debug")("shiba:game")
const debugtick = require("debug")("verbose:tick")
module.exports = class BustabitClient extends EventEmitter {
constructor(config) {
super()
this.config = config
this.clearState()
debug("Setting up connection to %s", config.API_SERVER)
this.socket = new PowerClient(config.API_SERVER, config.API_KEY, config.SESSION)
this.socket.on("connected", this.handleConnected.bind(this))
this.socket.on("disconnected", this.handleDisconnected.bind(this))
this.socket.on("error", error => console.error("onError", error))
this.socket.on("gameStarting", this.handleGameStarting.bind(this))
this.socket.on("betPlaced", this.handleBetPlaced.bind(this))
this.socket.on("gameStarted", this.handleGameStarted.bind(this))
this.socket.on("cashedOut", this.handleGameTick.bind(this))
this.socket.on("gameEnded", this.handleGameEnded.bind(this))
}
//Attempt to mute a user and return whether he actually was. Users are not muted if they are on
//the USER_WHITELIST in Config.js.
@param {string} uname
@param {string} [reason]
@param {string} [channel] chat channel to which the broadcast the mute
@param {number} [wagerRequirement] required wager volume before user can chat again, otherwise allowing the server to choose
@returns {Promise<boolean>} true if the user was muted
async doMute(uname, reason, channel, wagerRequirement = -1) {
if (this.config.USER_WHITELIST.includes(uname.toLowerCase())) {
debugchat("Not muting whitelisted user: %s amount: %s", uname, wagerRequirement)
return false
}
debugchat("Muting user: %s amount: %s", uname, wagerRequirement)
wagerRequirement = wagerRequirement || -1
try {
await this.socket.send("mute", { uname, reason, channel, wagerRequirement })
} catch (error) {
console.error("[BustabitClient.doMute]", error)
}
return true
}
//Send a public chat message to the given channel.
@param {string} message
@param {string} channel
async doSay(message, channel) {
debugchat("Saying:", message)
try {
await this.socket.send("say", { channel, message })
} catch (error) {
console.error("[BustabitClient.doSay]", error)
}
}
// Fetch a game's information and reshape it into what Pg.putGame expects.
@param {number} id game ID
@returns {Promise}
async getGameInfo(id) {
const game = await this.socket.send("getGameInfo", id)
game.created = new Date(game.created).getTime()
game.startTime = game.created + 5000
game.serverSeed = game.hash
game.playing = {}
game.cashedOut = []
for (const { uname, wager, cashOut } of game.bets) {
if (!cashOut) {
game.playing[uname] = { wager }
} else {
game.cashedOut.push({ uname, wager, cashedAt: cashOut })
}
}
return game
}
// event handlers
handleConnected(data) {
const { engineInfo, loggedIn } = data
if (!loggedIn) {
throw new Error("invalid session ID")
}
this.username = loggedIn.userInfo.uname
debug("connected to server as", this.username)
// TODO: game server sends incorrect/incomplete information for games that were forcibly ended
// save current game state
this.game = {
id: engineInfo.gameId,
state: engineInfo.gameState,
created: Date.now() - engineInfo.elapsed - 5000,
startTime: Date.now() - engineInfo.elapsed,
playing: engineInfo.playing,
cashedOut: engineInfo.cashedOut || [],
}
this.emit("connected", data)
}
handleDisconnected(reconnectIn) {
debug(`disconnected from server. attempting to reconnect in ${reconnectIn/1000}s`)
this.clearState()
}
handleGameStarting({ gameId }) {
debuggame(`Game #${gameId} starting`)
this.game = {
id: gameId,
state: "GAME_STARTING",
created: Date.now(),
startTime: Date.now() + 5000,
playing: {},
cashedOut: [],
}
this.emit("gameStarting")
}
handleBetPlaced({ uname, wager, payout }) {
debuggame(`Player ${uname} wagered ${wager} @ ${payout.toFixed(2)}`)
this.game.playing[uname] = { wager, payout }
}
handleGameStarted() {
debuggame(`Game #${this.game.id} started`)
this.game.state = "GAME_STARTED"
this.emit("gameStarted")
}
handleGameTick([ multiplier, cashOuts ]) {
debugtick(`Game #${this.game.id} ticked`, { multiplier, cashOuts: cashOuts.length })
// players that were cashed out automatically
for (const uname of Object.keys(this.game.playing)) {
const { wager, payout } = this.game.playing[uname]
if (multiplier >= payout) {
this.game.cashedOut.push({ uname, wager, cashedAt: payout })
delete this.game.playing[uname]
debuggame(`Player ${uname} was automatically cashed out at ${payout.toFixed(2)}`)
}
}
// players that cashed out manually
for (const [ cashedAt, uname ] of cashOuts) {
console.assert(this.game.playing[uname])
const { wager } = this.game.playing[uname]
this.game.cashedOut.push({ uname, wager, cashedAt })
delete this.game.playing[uname]
debuggame(`Player ${uname} manually cashed out at ${cashedAt.toFixed(2)}`)
}
this.emit("cashedOut")
}
handleGameEnded({ bust, forced, hash }) {
debuggame(`Game #${this.game.id} crashed @${bust}`)
this.game.state = "GAME_ENDED"
this.game.bust = bust
this.game.forced = forced
this.game.serverSeed = hash
if (forced) {
for (const uname of Object.keys(this.game.playing)) {
const { wager } = this.game.playing[uname]
this.game.cashedOut.push({ uname, wager, cashedAt: forced })
delete this.game.playing[uname]
debuggame(`Player ${uname} was forced to cash out at ${forced.toFixed(2)}`)
}
}
this.emit("gameEnded", this.game)
}
/** Reset the user and game state to its zero values. */
clearState() {
this.username = null
this.game = null
}
}
////子类别
@foreach($subcategories as $subcategory)
$subcategory = (array) $subcategory;
///"Trying to get property 'title' of non-object
///(upper code object data convert into array data)
{{ $subcategory->category->title }}
@endforeach
答案 1 :(得分：0)
由于类别包含子类别，并且子类别是子类别，因此请尝试这种方式
$category = category::with('subcategory')->get();
foreach($category as $cat){
$title = $cat->category[0]->title;
或者如果这不起作用
$title = $cat->category->title;
}