how to using rust diesel to do the full text query - postgresql

Question

I am trying to using diesel diesel = { version = "1.4.8", features = ["postgres","64-column-tables","chrono","serde_json"] } to do a full text query, this is the sql command look like:
SELECT * FROM article a WHERE to_tsvector('english', title) ## to_tsquery('english','Rate|Limiting')
how to using rust diesel to do this query? I am using the like right now and want to switch to full text search, this is the like query code main.rs look like:
#[macro_use]
extern crate diesel;
use diesel::{TextExpressionMethods, QueryDsl, RunQueryDsl};
use rust_wheel::config::db::config;
use crate::model::diesel::dict::dict_models::Article;
mod model;
fn main() {
use model::diesel::dict::dict_schema::article as article_table;
let connection = config::establish_connection();
let mut query = article_table::table.into_boxed::<diesel::pg::Pg>();
query = query.filter(article_table::title.like(format!("{}{}{}","%","demo","%")));
let query_result = query.load::<Article>(&connection);
}
and this is the schema files dict_schema.rs look like:
table! {
article (id) {
id -> Int8,
user_id -> Int8,
title -> Varchar,
author -> Varchar,
guid -> Varchar,
created_time -> Int8,
updated_time -> Int8,
link -> Nullable<Varchar>,
sub_source_id -> Int8,
cover_image -> Nullable<Varchar>,
channel_reputation -> Int4,
editor_pick -> Nullable<Int4>,
}
}
and this is the model files dict_models.rs look like:
// Generated by diesel_ext
#![allow(unused)]
#![allow(clippy::all)]
use std::io::Write;
use diesel::deserialize::FromSql;
use diesel::pg::Pg;
use diesel::serialize::{Output, ToSql};
use diesel::sql_types::Jsonb;
use rocket::serde::Serialize;
use serde::Deserialize;
use chrono::DateTime;
use chrono::Utc;
use crate::model::diesel::dict::dict_schema::*;
#[derive(Queryable,QueryableByName,Debug,Serialize,Deserialize,Default,Clone)]
#[table_name = "article"]
pub struct Article {
pub id: i64,
pub user_id: i64,
pub title: String,
pub author: String,
pub guid: String,
pub created_time: i64,
pub updated_time: i64,
pub link: Option<String>,
pub sub_source_id: i64,
pub cover_image: Option<String>,
pub channel_reputation: i32,
pub editor_pick: Option<i32>,
}
and this is the dependencies Cargo.toml look like:
[package]
name = "rust-learn"
version = "0.1.0"
edition = "2018"
[dependencies]
rocket = { version = "=0.5.0-rc.2", features = ["json"] }
serde = { version = "1.0.64", features = ["derive"] }
serde_json = "1.0.64"
serde_derive = "1.0"
# database
diesel = { version = "1.4.7", features = ["postgres","serde_json"] }
dotenv = "0.15.0"
jsonwebtoken = "7"
chrono = "0.4"
config = "0.11"
ring = "0.16.20"
md5 = "0.7.0"
data-encoding = "2.3.2"
diesel_full_text_search = "1.0.1"
bigdecimal = "0.3.0"
# reddwarf public component
rust_wheel = { git = "https://github.com/jiangxiaoqiang/rust_wheel.git" }
What shuld I do to change to like query to full text search query? I am searching from internet but no one talk about this issue. BTW: this is the cargo version:
➜ rust-learn git:(group-by) ✗ cargo version
cargo 1.62.0 (a748cf5a3 2022-06-08)
and this is the rust version:
➜ rust-learn git:(group-by) ✗ rustc --version
rustc 1.62.0 (a8314ef7d 2022-06-27)
any idea about this issue? what should i do to using the full text search in diesel?
I have tried to add the dependencies diesel_full_text_search = "1.0.1" and tweak the main.rs code like this:
#[macro_use]
extern crate diesel;
use diesel::{TextExpressionMethods, QueryDsl, RunQueryDsl};
use diesel_full_text_search::{to_tsquery, to_tsvector, TsQueryExtensions};
use rust_wheel::config::db::config;
use diesel_full_text_search::TsVectorExtensions;
use crate::model::diesel::dict::dict_models::Article;
mod model;
fn main() {
use model::diesel::dict::dict_schema::article as article_table;
let connection = config::establish_connection();
let mut query = article_table::table.into_boxed::<diesel::pg::Pg>();
let filter_title = "经济 文化";
let query_items: Vec<&str> = filter_title.trim().split_whitespace().collect();
let query_array = query_items.join(" & ");
let tsquery = to_tsquery(query_array);
let tsvector = to_tsvector("'dolphinzhcfg', title");
query = query.filter(&tsvector.matches(&tsquery));
let query_result = query.load::<Article>(&connection);
}
shows error:
mismatched types [E0308] expected `char`, found `&to_tsquery<String>`
what should I do to fixed this problem?

Answer 1

Checkout the following functions:
diesel_full_text_search::to_tsvector
diesel_full_text_search::to_tsquery
diesel_full_text_search::TsVectorExtensions::matches