`post.local_dates` is coming from the core discourse plugin, which has the following implementation:
```
add_to_class(:post, :local_dates) do
custom_fields[DiscourseLocalDates::POST_CUSTOM_FIELD] || []
end
```
Meaning we should always at least get an array, however, if the core local dates plugin is disabled, add_to_class will be called and the method added , however it will return nothing if the plugin is not enabled.
Source location correctly leads to the `add_to_class` block:
```
[9] pry(main)> Post.last.method(:local_dates).source_location
=> ["/discourse/lib/plugin/instance.rb", 260]
```
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