![](/img/trans.png)
[英]Vuex & VueJS (Do not mutate vuex store state outside mutation handlers)
[英]VueJS2 and Vuex deep nested state object mutation — claims state variable is undefined
我一直在嘗試更新state.describeFields.user
並在渲染中遇到錯誤:TypeError:無法讀取未定義的屬性“ user””
該錯誤所依賴的代碼段是: state.describeFields[payload.obj] = payload.data;
其中payload.obj
是“用戶”或“帳戶”
我想這是問題的根源,但是我對開發人員的了解不足,無法理解所有含義。 到達那里...謝謝你們。
雛菊鏈從this。$ store.dispatch('setCurrentIntegration',{data:{stuff:'here'}})開始
這應該發生的是:
更新state.integration(有效)
從indexeddb( retrieveLocalDescribeFields
)中獲取每個state.objects
值的新項目,然后通過屬性鍵將它們保存到state.describeFields(諷刺的是,實際上將它們保存到state,但隨后出現錯誤)
如果沒有數據從retrieveLocalDescribeFields
到達,則出去到遠程api收集數據(代碼永遠不會到達這里,但是在我將所有這些都移到vuex之前可以正常工作)
我已經嘗試將promise進行分組,更具體地說,我已經嘗試在錯誤的函數中對state.describeFields和payload.data進行console.log的輸出,這兩個結果均會輸出到控制台。
export default {
state: {
integration: {},
objects: ["user", "account"],
describeFields: { user: [], account: [] }
},
getters: {
getCurrentIntegration(state) {
return state.integration;
},
getCurrentDescribeFields: state => obj => {
return state.describeFields.hasOwnProperty(obj)
? state.describeFields[obj]
: [];
}
},
actions: {
setCurrentIntegration({ commit, dispatch, state }, payload) {
return new Promise(resolve => {
commit("updateCurrentIntegration", payload);
let promises = [];
state.objects.forEach(obj => {
promises.push(dispatch("retrieveLocalDescribeFields", { obj: obj }));
});
resolve(Promise.all(promises));
});
},
setCurrentDescribeFields({ commit }, payload) {
return new Promise(resolve => {
commit("updateCurrentDescribeFields", payload);
resolve(true);
});
},
setClearDescribeFields({ commit }) {
return new Promise(resolve => {
commit("updateClearDescribeFields");
resolve(true);
});
},
retrieveLocalDescribeFields({ commit, dispatch, state, getters }, payload) {
return new Promise(resolve => {
// go get data from indexeddb...
// dexis call omitted
if (theFields.length) {
resolve(
commit("updateCurrentDescribeFields", {
obj: payload.obj,
data: theFields
})
);
} else {
resolve(dispatch("retrieveRemoteDescribeFields", payload));
}
});
},
retrieveRemoteDescribeFields({ commit, state, getters }, payload) {
return new Promise(resolve => {
// go get data from remote api...
// axios call omitted
commit("updateCurrentDescribeFields", {
obj: payload.obj,
data: res.data.records
});
resolve(true);
});
}
},
mutations: {
updateClearDescribeFields(state) {
state.describeFields = { user: [], account: [] };
},
updateCurrentIntegration(state, payload) {
state.integration = payload.data;
},
updateCurrentDescribeFields(state, payload) {
state.describeFields[payload.obj] = payload.data;
}
}
};
好。 -hangs head in shame-
問題出在同級組件由於setCurrentDescribedFields(分頁組件)而發生了變化。
那是那件犯錯的東西。 跟蹤恰好可以追溯到商店突變。 ah!
感謝您的快速幫助。 贊賞!
聲明:本站的技術帖子網頁,遵循CC BY-SA 4.0協議,如果您需要轉載,請注明本站網址或者原文地址。任何問題請咨詢:yoyou2525@163.com.