Adding full-text search.

internal/data/movies.go

@@ -195,9 +195,14 @@ func (m MovieModel) Delete(id int64) error {
 // GetAll : Returns a slice of movies. Although we're not using them right now, we've set this up to accept the various filter parameters as arguments
 func (m MovieModel) GetAll(title string, genres []string, filters Filters) ([]*Movie, error) {
 	// Construct the SQL query to retrieve all movie records.
+	// to_tsvector('simple', title) transforms 'The Breakfast Club' into 'breakfast' 'club' 'the'. The 'simple' parameter's value is the configuration.
+	// plainto_tsquery('simple', $1) takes a search value and turns it into a formatted query term that PostgreSQL full-text search can understand. As an example : "The Club" would result in the query term 'the' & 'club'
+	// The @@ operator is the matches operator. To continue the example, the query term 'the' & 'club' will match rows which contain both lexemes 'the' and 'club'.
 	query := `
 		SELECT id, created_at, title, year, runtime, genres, version
 		FROM movies
+		WHERE (to_tsvector('simple', title) @@ plainto_tsquery('simple', $1) OR $1 = '')
+		AND (genres @> $2 OR $2 = '{}')
 		ORDER BY id`
 
 	// Create a context with a 3-second timeout
@@ -205,7 +210,7 @@ func (m MovieModel) GetAll(title string, genres []string, filters Filters) ([]*M
 	defer cancel()
 
 	// Use QueryContext() to execute the query. This returns a sql.Rows resultset containing the result
-	rows, err := m.DB.QueryContext(ctx, query)
+	rows, err := m.DB.QueryContext(ctx, query, title, pq.Array(genres))
 	if err != nil {
 		return nil, err
 	}