I have an issue and I could really use some help. I am very new to react and react-redux, so the solution is probably simpler than I might think(I hope so). I have a simple site, that contains Links (from react-router) with names of recipes:
class Posts extends Component {
componentWillMount() {
this.props.fetchPosts();
}
componentWillReceiveProps(nextProps) {
if (nextProps.newPost) {
this.props.posts.unshift(nextProps.newPost);
}
}
render() {
const postItems = this.props.posts.map(recipe => (
<div key={recipe.id}>
<Link to={`/recipe/id/${recipe.id}`}>{recipe.name}</Link>
</div>
));
return (
<Router>
<div>
<h1>Well yeah</h1>
{postItems}
<Route path={`/recipe/id/:recipeId`} component={Post}/>
</div>
</Router>
);
}
}
Posts.propTypes = {
fetchPosts: PropTypes.func.isRequired,
posts: PropTypes.array.isRequired,
newPost: PropTypes.object,
};
const mapStateToProps = state => ({
posts: state.posts.items,
newPost: state.posts.item,
});
export default connect(mapStateToProps, {fetchPosts})(Posts);
Now, I also have a component Post, which is supposed to be a single recipe.
class Post extends Component {
static propTypes = {};
componentDidMount() {
this.props.fetch();
}
render() {
return (
<div>Hello{this.props.recipe.name}</div>
);
}
}
Post.propTypes = {
fetch: PropTypes.func.isRequired,
recipe: PropTypes.object
};
const mapDispatchToProps = (dispatch, ownProps) => ({
fetch: () => {
dispatch(fetchPostById(ownProps.location.pathname))
}
});
const mapStateToProps = state => ({
recipe: state.posts.recipe
});
export default connect(mapStateToProps, mapDispatchToProps)(Post);
Regardless of what I do, I can't seem to make it work properly. I have an action that fetches the single recipe(I have no problem fetching the list of recipes) and then pass it to the reducer. However, when I put console.log(action.payload) in the case in the reducer, it shows the Object containing the recipe in the console just fine. But when I put {this.props.recipe.name} in Post.js I get an error That this.props.recipe is undefined. Any help is very appreciated. To be sure, I will also post the code of the reducer and the actions.
Reducer:
const initialState = {
items: [],
item: {},
recipe:{}
};
export default function (state = initialState, action) {
switch (action.type) {
case FETCH_RECIPES:
return {
...state,
items: action.payload
};
case NEW_RECIPE:
return {
...state,
item: action.payload
};
case FETCH_RECIPE_ID:
return{
...state,
recipe:action.payload
};
default:
return state;
}
}
Actions:
export const fetchPosts = () => dispatch => {
fetch('http://192.168.1.3:6996/recipe')
.then(res => res.json())
.then(recipes => dispatch({
type: FETCH_RECIPES,
payload: recipes
}));
};
export const createPost = (postData) => dispatch => {
fetch('http://192.168.1.3:6996/recipe', {
method: 'POST',
headers: {
'content-type': 'application/json'
},
body: JSON.stringify(postData)
}).then(res => res.json()).then(recipe => dispatch({
type: NEW_RECIPE,
payload: recipe
}))
};
export const fetchPostById= (id) => dispatch => {
fetch('http://192.168.1.3:6996' + id)
.then(recipe => recipe.json())
.then(recipe => dispatch({
type: FETCH_RECIPE_ID,
payload: recipe
}))
};
Main reducer:
import { combineReducers } from 'redux'
import postReducer from './postReducer'
export default combineReducers({
posts: postReducer
});
after switching off WebStorm for the night, the site fired up the next morning and worked somewhat fine. I have a problem with the react-router part sill, but I will post different question, so I don't break any rules. Thanks a lot!
In this line recipe: state.posts.recipe
you are implying that there is a posts object in your state that holds your recipe, but in the reducer, I don't see any posts object in your state. try changing it to this line recipe: state.recipe
The technical post webpages of this site follow the CC BY-SA 4.0 protocol. If you need to reprint, please indicate the site URL or the original address.Any question please contact:yoyou2525@163.com.