How to implement the 'visible only by strangers' permission control and pagination display of articles?

Article permission control and pagination display: Implement the "visible only by strangers" function

Many users need to set access to articles, such as "visible only for friends", "visible for everyone", and "visible only for strangers". This article focuses on how to implement the "visible only by strangers" function, and analyzes its technical feasibility in combination with the need to display article lists on paging.

Users hope to implement permission control for different articles on an article list page. Each article can set three permissions: "only friends can be seen", "everyone can be seen" and "only strangers can be seen". Suppose users A and B are friends and user C are strangers. If a user posts an article that is "only visible to friends", only A and B are visible; if a user posts an article that is "only visible to strangers", only C is visible, and neither A and B are visible. At the same time, the list needs to support paging function.

There are challenges in directly implementing the logic of "visible only by strangers". The concept of "Stranger" is opposite to "Login User". The user's identity is not recognized and the system cannot determine whether it is a stranger to a specific user. Only after logging in can the system determine which articles are visible based on the user's identity. The permission setting of "visible only by strangers" needs to be redefined and can be understood as "visible by non-friendly", that is, only users who are not logged in or non-friendly can view it.

Therefore, the key to implementation is to determine whether the current user is a friend of the article publisher and whether the user is logged in. The system can effectively control article visibility by verifying the identity of the currently logged-in user and querying the relationship between the user and the poster (for example, through a friend relationship database). The paging function can be implemented through the paging query function of the database, and the query is filtered based on the current user identity and article visibility permissions. In this way, the article list page can display all articles that the current user has the right to view and implement the pagination function.

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