# Discord Post Draft - Mojo Community Help

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**Seeking Guidance: Dict Iterator Pattern for Building Nested Structures**

Hi Mojo community! I'm relatively new to Mojo and building a native TOML parser as a learning project ([GitHub](https://github.com/DataBooth/mojo-toml)). I've hit what seems like a Dict iteration limitation and would love guidance on the right pattern to use.

**What I'm Trying To Do:** Parse TOML files with table headers and build nested Dict structures:

``` toml
[database]
host = "localhost"
```

→ Should create `{"database": {"host": "localhost"}}`

**The Problem:** I need to iterate Dict entries to copy/build nested structures, but can't access the entries:

``` mojo
for entry in dict.items():
    var key = entry[].key     // ❌ Error: DictEntry is not subscriptable
    var val = entry[].value   // ❌ Error: not subscriptable
```

**What I've Tried:** - Using `.keys()` iterator → same subscripting issue - Get-modify-put pattern → requires iteration to copy - Multiple architectural approaches → all hit the same wall

**Current Status:** ✅ Arrays and inline tables work great (71 tests passing) ❌ Blocked on table headers due to this iteration issue

**Question:** Is there a recommended pattern for iterating Dict entries to build new structures? Or am I approaching this wrong for Mojo's ownership model?

Full technical details and attempted approaches: [TABLE_HEADERS_BLOCKER.md](https://github.com/DataBooth/mojo-toml/blob/main/docs/TABLE_HEADERS_BLOCKER.md)

Any guidance appreciated! Still learning Mojo's patterns. 🔥

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