Adding Value::From<PretokenizedText> (#697)

examples/pre_tokenized_text.rs

@@ -67,9 +67,7 @@ fn main() -> tantivy::Result<()> {
 
     // Now lets create a document and add our `PreTokenizedString` using
     // `add_pre_tokenized_text` method of `Document`
-    let mut old_man_doc = Document::default();
-    old_man_doc.add_pre_tokenized_text(title, &title_tok);
-    old_man_doc.add_pre_tokenized_text(body, &body_tok);
+    let old_man_doc = doc!(title => title_tok, body => body_tok);
 
     // ... now let's just add it to the IndexWriter
     index_writer.add_document(old_man_doc);

src/schema/value.rs

@@ -233,6 +233,12 @@ impl From<Vec<u8>> for Value {
     }
 }
 
+impl From<PreTokenizedString> for Value {
+    fn from(pretokenized_string: PreTokenizedString) -> Value {
+        Value::PreTokStr(pretokenized_string)
+    }
+}
+
 mod binary_serialize {
     use super::Value;
     use crate::common::{f64_to_u64, u64_to_f64, BinarySerializable};