Problem

Users reported being unable to find a Rust example for multiple section types, despite examples existing for Go, Node, and Java implementations. This created confusion about whether casbin-rs supports this feature.

Reference: https://casbin.org/docs/syntax-for-models#multiple-section-types

Solution

Added a comprehensive, runnable example demonstrating multiple section types support in casbin-rs.

What's New

examples/multi_section.rs - A standalone example showing:

• How to use multiple section types in a single model
• Section 1 (default): Three-parameter model (subject, action, object)
• Section 2: Two-parameter model (subject, action)
• How to use EnforceContext to switch between sections

Updated README.md - Added "Multiple section types" entry to the examples table

Example Usage

use casbin::prelude::*;
use casbin::EnforceContext;

let e = Enforcer::new(
    "examples/multi_section_model.conf",
    "examples/multi_section_policy.csv",
).await?;

// Use default section (Section 1)
e.enforce(("alice", "read", "project1"))?;

// Use Section 2 via EnforceContext
let ctx = EnforceContext::new("2");
e.enforce_with_context(ctx, ("james", "execute"))?;

Why This Matters

This example:

• ✅ Demonstrates that casbin-rs fully supports multiple section types
• ✅ Provides parity with other Casbin language implementations
• ✅ Includes clear documentation on how policies and matchers work
• ✅ Works with both tokio and async-std runtimes

Users can now easily discover and understand how to use multiple section types in their Rust projects.

• Fixes rust multiple section types example #318

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