Redux技术疑问：State与数据模型的区别（非React示例应用场景）

Hey there! Let's break down the core differences between Redux State and data models using your specific app example to make this crystal clear.

First: What's a Data Model? #

Think of data models as the blueprint for your business data—they define the structure, properties, and relationships of the core entities in your app, completely independent of Redux or any state management tool.

For your membership/order app, your data models would look something like this (pseudocode):

// Member data model: Defines what a "member" is at a business level
interface Member {
  id: number;
  username: string;
  email: string;
  joinDate: string;
  // Any other fixed properties a member has
}

// Order data model: Defines what an "order" is
interface Order {
  orderId: string;
  memberId: number;
  orderDate: string;
  totalAmount: number;
  status: "pending" | "completed" | "cancelled";
}

These models don't care about whether a member is selected, or if data is loading—they just describe the shape of the data your app works with, matching what your backend sends or expects.

Second: What's Redux State? #

Redux State is the live, runtime snapshot of your entire app's state—it's a single object that holds not just your business data (instances of your data models), but also all the UI and interaction-specific state that your app needs to function.

For your app, a typical Redux State might look like this:

const initialReduxState = {
  // Business data (instances of your data models)
  membersList: [] as Member[], // The full list of members for Table A
  selectedMemberOrders: [] as Order[], // Orders for the selected member (Table B)
  searchedMemberDetails: null as Member | null, // Result of the username search
  // UI/interaction state (NOT part of data models)
  selectedMemberId: null as number | null, // Tracks which member is currently selected
  isLoadingMembers: false, // Whether Table A is fetching data
  isLoadingOrders: false, // Whether Table B is fetching data
  searchInputValue: "", // The current text in Table A's search box
  errorMessage: null as string | null, // Error text if a request fails
};

Core Differences at a Glance #

Let's distill the key distinctions using your app context:

• Purpose: Data models define what your data is; Redux State defines what's happening in your app right now.
• Content: Data models only include business entity properties; Redux State includes those entities + UI state (selected IDs, loading statuses, input values, etc.).
• Static vs. Dynamic: Data models are fixed (you define them once as part of your app's code structure); Redux State changes constantly as users interact with your app (selecting members, searching, loading data).
• Scope: Data models are focused on single entities (one member, one order); Redux State is a global container that ties all parts of your app's state together.

A Quick Example from Your App #

• When your backend returns a member's data, it fits the Member data model—this is just raw business data.
• When you store that member in Redux State alongside tracking that it's the currently selected member (selectedMemberId), you're combining the data model instance with app-specific state to make your UI work.

内容的提问来源于stack exchange，提问作者Nishant Jani