dede arcrank 2

Of course. Let's break down what dede arcrank -2 means in the context of the Dedecms (DedeCMS) content management system.

This is a very common and powerful parameter used in the DedeCMS template engine.

In a Nutshell

dede arcrank -2 is a tag attribute used to fetch and display content from the DedeCMS database. The -2 specifically means: "Show me all articles, regardless of their 'arcrank' status, EXCEPT for those that are deleted (arcrank = -2)."

Detailed Breakdown

To fully understand this, let's look at the three components:

dede

This is the namespace prefix for all DedeCMS template tags. It tells the DedeCMS parser that this is a system tag. You'll see it in many other tags like {dede:arclist}, {dede:channel}, {dede:field}, etc.

arcrank

This is the most important part. arcrank is a database field in the dede_archives table (the main table for articles in DedeCMS). It's a small integer that acts as a status flag for an article.

Here are the common values for arcrank and what they mean:

-2 (The Value)

When you use arcrank="-2" in a tag, you are setting a filter on the query. The DedeCMS system will then add a WHERE clause to its SQL query.

• arcrank='-2': This would fetch only the articles that have been deleted.
• arcrank='0': This would fetch only the normal, public articles.
• arcrank='-1': This would fetch only the articles pending review.

The Special Case of arcrank="-2" in a List Tag

This is where it gets interesting and is the most common use case. When you use arcrank="-2" inside a list-generating tag like {dede:arclist} or {dede:sql}, it has a special meaning.

It's interpreted as: "Exclude articles with arcrank = -2".

It's a shortcut for writing a more complex condition. The system essentially does this:

-- The actual logic behind arcrank="-2"
SELECT * FROM dede_archives WHERE arcrank <> -2
-- Or sometimes:
SELECT * FROM dede_archives WHERE arcrank IN (0, -1, 1, 2, ...) 

This is extremely useful because it's a simple way to say, "Show me everything that hasn't been permanently deleted," which is usually what you want on a public-facing page.

Practical Examples

Example 1: Displaying All Public and Pending Articles on the Frontend

Imagine you have a page that lists all submitted content, whether it's been approved or not (maybe for a moderator's dashboard). You want to exclude only the deleted articles.

{dede:arclist titlelen='30' row='10' arcrank='-2'}
    <li>
        <a href="[field:arcurl/]">[field:title/]</a>
        <span>状态: [field:arcrank function="GetArank(@me)"/]</span>
    </li>
{/dede:arclist}

In this example, arcrank="-2" ensures that deleted articles (arcrank = -2) are not shown. Articles with arcrank = 0 (Normal) and arcrank = -1 (Pending) will be displayed.

Example 2: Displaying ONLY Normal, Public Articles

If you want to show only the articles that are live for the general public, you would explicitly set arcrank="0".

{dede:arclist titlelen='30' row='10' arcrank='0'}
    <li><a href="[field:arcurl/]">[field:title/]</a></li>
{/dede:arclist}

This is the most common configuration for a standard news or blog page.

Summary

In conclusion, dede arcrank -2 is a filter that tells DedeCMS to pull all content except for the items that have been marked as deleted. It's a convenient way to ensure your public pages are clean and only show relevant content.