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model.ts
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model.ts
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import { all } from "redux-saga/effects";
import { writingActions } from './sagaHelpers';
import { Action } from "redux";
export function model<T extends { root: () => Generator, [key: string]: any }, S = any>(nameSpace: string,
modelObj: T,
initState?: S
) {
try {
const newModel = {};
Object.keys(modelObj).forEach((key) => {
if (key === 'root') {
if (typeof modelObj[key] !== 'function') {
throw new Error(`property 'root' of model ${nameSpace} should be a function or generator`);
}
Object.defineProperty(newModel, key, {
value: modelObj[key].bind(newModel),
writable: true,
enumerable: false,
configurable: true
});
return;
}
if (typeof modelObj[key] === 'function') {
if (!/^_/.test(key)) {
const actionType = nameSpace + '_' + key;
newModel[key] = modelObj[key].bind(newModel);
newModel[key].actionType = actionType;
newModel[key].action = (data) => ({
type: actionType,
...data
});
} else {
Object.defineProperty(newModel, key, {
value: modelObj[key].bind(newModel),
writable: true,
enumerable: false,
configurable: true
});
}
return;
}
Object.defineProperty(newModel, key, {
value: modelObj[key],
writable: true,
enumerable: false,
configurable: true
});
});
Object.defineProperty(newModel, 'nameSpace', {
value: nameSpace,
writable: true,
enumerable: false,
configurable: true
});
const action = {};
Object.keys(newModel).forEach((key) => {
action[key] = newModel[key].action;
});
Object.defineProperty(newModel, 'action', {
value: action,
enumerable: false
});
Object.defineProperty(newModel, 'initState', {
value: initState,
enumerable: false
});
Object.defineProperty(newModel, 'nameSpace', {
value: nameSpace,
enumerable: false
});
Object.defineProperty(newModel, 'select', {
value: function (s) {
if (!this._rootSelector) {
throw new Error(`model '${this.nameSpace}' should be added to 'combineModels()' before using .select method.`);
}
return this._rootSelector(s)[this.nameSpace];
}.bind(newModel),
enumerable: false,
writable: false,
configurable: false
});
return newModel as T & {
action: {
[key in keyof T]: (...args: Parameters<T[key]>) => Action
},
select: (store: any) => S
};
} catch (e) {
console.error(e);
throw e;
}
}
export function combineModels(models, rootSelector = s => s) {
const modelInitStates = {};
const modelRootSagas = {};
models.forEach((model) => {
Object.defineProperty(model, '_rootSelector', {
value: rootSelector,
enumerable: false,
writable: false,
configurable: false
});
modelInitStates[model.nameSpace] = model.initState;
modelRootSagas[model.nameSpace] = model.root();
});
const reducer = (state = modelInitStates, action) => {
if (writingActions.hasOwnProperty(action.type)) {
const { reducer, nameSpace } = action;
return {
...state,
[nameSpace]: reducer(state[nameSpace])
}
}
return state;
};
function* saga() {
try {
yield all(modelRootSagas);
} catch (e) {
console.error(e);
throw e;
}
}
return { reducer, saga: saga as () => Generator<any> }
}