"Read only field" displayed in the post request

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```
class MessagesSerializers(serializers.ModelSerializer):
message = serializers.CharField(min_length=1)
class Meta:
model = ChatMessages
fields = ('message','chat','user','date')
read_only_fields = ('chat','user')
```

Start by reviewing the documentation entry for ModelSerializer fields and the read_only_fields option, using the supplied MessagesSerializers example as the reproduction case. Determine whether the displayed read-only fields reflect missing or unclear documentation, then update the relevant guidance so the expected POST behavior is explicit.

Written by the indexing model from the issue text.