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fix: Reducer called twice due to use set on shallow copy of the state

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- Using set on the shallow copy of the state object caused reducer called twice; reducer function should be pure; use deep copy of the state instead of shallow copy
This commit is contained in:
Sheng Xiao
2020-06-05 19:01:33 -07:00
parent 35f5589f95
commit 882a0d5db7
1 changed files with 16 additions and 15 deletions
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31
src/context/AppContext.js
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@ -92,31 +92,32 @@ const initialState = {
const reducer = (state, { type, payload }) => {
let items;
const newState = JSON.parse(JSON.stringify(state));
switch (type) {
case 'migrate_section':
return set({ ...state }, `data.${payload.key}`, payload.value);
return set({ ...newState }, `data.${payload.key}`, payload.value);
case 'add_item':
items = get({ ...state }, `data.${payload.key}.items`, []);
items = get({ ...newState }, `data.${payload.key}.items`, []);
items.push(payload.value);
return set({ ...state }, `data.${payload.key}.items`, items);
return set({ ...newState }, `data.${payload.key}.items`, items);
case 'delete_item':
items = get({ ...state }, `data.${payload.key}.items`, []);
items = get({ ...newState }, `data.${payload.key}.items`, []);
remove(items, x => x === payload.value);
return set({ ...state }, `data.${payload.key}.items`, items);
return set({ ...newState }, `data.${payload.key}.items`, items);
case 'move_item_up':
items = get({ ...state }, `data.${payload.key}.items`, []);
items = get({ ...newState }, `data.${payload.key}.items`, []);
move(items, payload.value, -1);
return set({ ...state }, `data.${payload.key}.items`, items);
return set({ ...newState }, `data.${payload.key}.items`, items);
case 'move_item_down':
items = get({ ...state }, `data.${payload.key}.items`, []);
items = get({ ...newState }, `data.${payload.key}.items`, []);
move(items, payload.value, 1);
return set({ ...state }, `data.${payload.key}.items`, items);
return set({ ...newState }, `data.${payload.key}.items`, items);
case 'on_input':
return set({ ...state }, payload.key, payload.value);
return set({ ...newState }, payload.key, payload.value);
case 'save_data':
localStorage.setItem('state', JSON.stringify(state));
return state;
localStorage.setItem('state', JSON.stringify(newState));
return newState;
case 'import_data':
if (payload === null) return initialState;
@ -127,18 +128,18 @@ const reducer = (state, { type, payload }) => {
}
return {
...state,
...newState,
...payload,
};
case 'load_demo_data':
return {
...state,
...newState,
...demoData,
};
case 'reset':
return initialState;
default:
return state;
return newState;
}
};