How to generate non-prefix autocomplete suggestions?

Question

I would like to add autocomplete to my tagging functionality.

A couple of questions:

1. How do I generate a list of autocomplete suggestions that includes matches in both the prefix and the middle of string? For example, if the user type "auto", the autocomplete suggestions should include terms such as "autocomplete" and "build automation".

2. I would like to allow multi-word tags and use comma (",") as a separator for tags. So when the use hits the space bar, he is still typing out the same tag, but when he hits the comma key, he's starting a new tag. How do I do that?

I am using Django, jQuery, MySQL, and Solr. What is the best way to achieve to implement the above 2 features?

Answer 1

1. Use the NGramTokenizerFactory. Use the analysis console to see how it works. Also see this article (but you would use NGram instead of EdgeNGram).
2. Not sure what you mean by "tags" but I guess you have a multivalued field "tags", so your code would parse the input (splitting by ",") before sending the data to Solr.