How to use mapMutations helper?
mapMutations is a helper function of Vuex that maps mutations in the store to methods within the component, thereby simplifying the call. It allows you to trigger mutation via this.increment() instead of this.$store.commit('increment') to keep the code simple and easy to maintain. When using it, you need to import it from vuex and introduce it in component methods through array form (name consistent) or object form (renamed) such as: ...mapMutations(['increment', 'decrement']) or ...mapMutations({ add: 'increment' }). Suitable for scenarios where multiple mutations are frequently called, such as shopping cart operation. Note: It must be used in methods, the expansion operator needs to be used to distinguish mapActions, and the modular store needs to add a namespace path.
In Vuex, mapMutations is a very practical helper function that can help you map the store's mutation into a method in a component. Simply put, it allows you to manually write this.$store.commit('xxx') every time, making the code simpler and easier to maintain.
What are mapMutations and their functions?
mapMutations is a helper function provided by Vuex and belongs to the vuex/helpers module. Its core role is to quickly map mutations defined in the store into methods within the component. This way you can trigger mutation like calling normal methods, such as this.increment() instead of this.$store.commit('increment') .
Using it does not change the behavior of mutation, it just simplifies the way it calls.
How to use mapMutations in components?
You can import this function by import { mapMutations } from 'vuex' and then use it in the component's methods .
There are two common uses:
- Array form (recommended) : Applicable to cases where the mutation name and method name are consistent.
- Object Form : Applicable to situations where you want to name the method differently.
import { mapMutations } from 'vuex'
export default {
methods: {
...mapMutations(['increment', 'decrement']),
// Or change the name in an object form // ...mapMutations({ add: 'increment', minus: 'decrement' })
}
} After that, you can directly call this.increment() in the template or other methods to trigger the corresponding mutation.
When is mapMutations suitable?
- You can reduce duplicate code when you need to call multiple mutations frequently.
- In interactive scenarios such as form submission and button clicks, using the mapped method will be more intuitive.
- If you want to keep the code structure clear and avoid
$store.commiteverywhere, it is more suitable.
For example, if you have a shopping cart page with multiple operations such as "increase quantity", "decrease quantity", "clear shopping cart", etc., each corresponding to mutation, it is very convenient to use mapMutations at this time.
What to note when using mapMutations
- It must be used in
methods, not in computed or life cycle hooks. - Remember to expand the use of operator
..., otherwise it will not be merged correctly into methods. - Don't confuse
mapActionsandmapMutations, one is used to call actions, and the other is to commit mutation directly. - If you use it in a modular store, you need to add a namespace path, for example:
mapMutations('cart', ['addToCart'])
This way you can correctly find the mutation in the module.
Basically that's it. The rational use mapMutations can make component logic clearer and easier to maintain. Although it is not complicated, do not miss the expansion operator and path configuration in details, otherwise errors are prone to occur.
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