Add support for partial term matches in search (#444)

* Add support for partial term matches in search

* Simplify

* Update unit tests to handle updated search logic

* Added custom function for search query that handles partials

* Fix some typos

* Oops, deleted too much

* Search for links as you type

Author: chadweimer

db/driver-postgres.go

@@ -30,14 +30,13 @@ type postgresRecipeDriverAdapter struct{}
 func (postgresRecipeDriverAdapter) GetSearchFields(filterFields []models.SearchField, query string) (string, []any) {
 	fieldStr := ""
 	fieldArgs := make([]any, 0)
-	for _, field := range supportedSearchFields {
-		if lo.Contains(filterFields, field) {
-			if fieldStr != "" {
-				fieldStr += " OR "
-			}
-			fieldStr += fmt.Sprintf("to_tsvector('english', r.%s) @@ plainto_tsquery('english', ?)", field)
-			fieldArgs = append(fieldArgs, query)
+
+	for _, field := range lo.Intersect(filterFields, supportedSearchFields[:]) {
+		if fieldStr != "" {
+			fieldStr += " OR "
 		}
+		fieldStr += fmt.Sprintf("to_tsvector('english', r.%s) @@ websearch_to_wildcard_tsquery('english', ?)", field)
+		fieldArgs = append(fieldArgs, query)
 	}
 
 	return fieldStr, fieldArgs

db/migrations/postgres/0024_enhanced_web_search.down.sql

@@ -0,0 +1,5 @@
+BEGIN;
+
+DROP FUNCTION IF EXISTS websearch_to_wildcard_tsquery(config regconfig, querytext text);
+
+COMMIT;

db/migrations/postgres/0024_enhanced_web_search.up.sql

@@ -0,0 +1,21 @@
+BEGIN;
+
+CREATE OR REPLACE FUNCTION websearch_to_wildcard_tsquery(config regconfig, querytext text)
+RETURNS tsquery AS $$
+    DECLARE
+        query_splits text[];
+        split text;
+        new_querytext text := '';
+    BEGIN
+        SELECT regexp_split_to_array(d::text, '\s* \s*') INTO query_splits FROM websearch_to_tsquery(config, querytext) d;
+        FOREACH split IN ARRAY query_splits LOOP
+            CASE WHEN split = '|' OR split = '&' OR split = '!' OR split = '<->' OR split = '!(' OR split = ')'
+                THEN new_querytext := new_querytext || split || ' ';
+            ELSE new_querytext := new_querytext || split || ':* ';
+            END CASE;
+        END LOOP;
+        RETURN to_tsquery(config, new_querytext);
+    END;
+$$ LANGUAGE plpgsql;
+
+COMMIT;

static/src/components/recipe-link-editor/recipe-link-editor.tsx

@@ -45,7 +45,8 @@ export class RecipeLinkEditor {
                 autocorrect="on"
                 spellcheck
                 autofocus
-                onIonBlur={e => this.query = e.target.value as string}
+                debounce={500}
+                onIonInput={e => this.query = e.target.value as string}
                 ref={el => this.searchInput = el} />
             </ion-item>
             <ion-content>
@@ -78,6 +79,13 @@ export class RecipeLinkEditor {
   @Watch('query')
   @Watch('includeArchived')
   async onSearchInputChanged() {
+    // Require at least 2 characters to search
+    if (isNullOrEmpty(this.query) || this.query.length < 2) {
+      this.matchingRecipes = [];
+      this.selectedRecipeId = null;
+      return;
+    }
+
     let states: RecipeState[] = [RecipeState.Active];
     if (this.includeArchived) {
       states = [...states, RecipeState.Archived];