dojo-orm 0.2.2

A simple ORM for Rust
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132

use std::collections::HashMap;
use std::fmt::Debug;
use std::marker::PhantomData;

use crate::execution;
use crate::execution::Execution;
use tracing::debug;

use crate::model::Model;
use crate::order_by::{OrderBy, OrderPredicate};
use crate::pagination::{Cursor, DefaultSortKeys, Pagination};
use crate::pool::*;
use crate::predicates::{Expr, ExprValueType, Predicate};
use crate::query_builder::{QueryBuilder, QueryType};
use crate::types::ToSql;

pub struct WhereSelect<'a, T> {
    pub(crate) pool: &'a Pool<PostgresConnectionManager<NoTls>>,
    pub(crate) params: Vec<&'a (dyn ToSql + Sync)>,
    pub(crate) columns: &'a [&'a str],
    pub(crate) order_by: Vec<OrderPredicate<'a>>,
    pub(crate) predicates: Vec<Predicate<'a>>,
    pub(crate) _t: PhantomData<T>,
}

impl<'a, T> WhereSelect<'a, T>
where
    T: Model + Debug,
{
    pub fn where_by(&'a mut self, predicate: Predicate<'a>) -> &'a mut Self {
        self.predicates.push(predicate);
        self
    }

    pub fn order_by(&'a mut self, order_by: OrderPredicate<'a>) -> &'a mut Self {
        self.order_by.push(order_by);
        self
    }

    pub async fn cursor(
        &'a self,
        first: Option<i64>,
        after: Option<Cursor>,
        last: Option<i64>,
        before: Option<Cursor>,
    ) -> anyhow::Result<Pagination<T>> {
        let qb = QueryBuilder::builder()
            .table_name(T::NAME)
            .default_keys(T::sort_keys())
            .columns(self.columns)
            .params(&self.params)
            .predicates(&self.predicates)
            .first(first)
            .after(&after)
            .last(last)
            .before(&before)
            .ty(QueryType::Paging)
            .build();

        let execution = Execution::new(self.pool, &qb);
        let query_all_fut = execution.all::<T>();

        let qb = QueryBuilder::builder()
            .table_name(T::NAME)
            .columns(&["COUNT(*) as count"])
            .params(&self.params)
            .predicates(&self.predicates)
            .ty(QueryType::Paging)
            .build();

        let execution = Execution::new(self.pool, &qb);
        let query_count_fut = execution.query_one();

        let (records, row) = tokio::try_join!(query_all_fut, query_count_fut)?;
        let count = row.get("count");

        debug!(?records);
        debug!(?count);

        Ok(Pagination::new(records, first, after, last, before, count))
    }

    fn query_by_limit(&'a self, limit: i64) -> QueryBuilder<'a> {
        QueryBuilder::builder()
            .table_name(T::NAME)
            .columns(self.columns)
            .params(&self.params)
            .predicates(&self.predicates)
            .order_by(&self.order_by)
            .ty(QueryType::Select)
            .limit(limit)
            .build()
    }

    pub async fn count(&'a self) -> anyhow::Result<i64> {
        let qb = QueryBuilder::builder()
            .table_name(T::NAME)
            .columns(&["COUNT(*) as count"])
            .params(&self.params)
            .predicates(&self.predicates)
            .ty(QueryType::Select)
            .build();

        let execution = Execution::new(self.pool, &qb);
        let row = execution.query_one().await?;

        let count = row.get("count");

        Ok(count)
    }

    pub async fn limit(&'a self, limit: i64) -> anyhow::Result<Vec<T>> {
        let qb = self.query_by_limit(limit);

        let execution = Execution::new(self.pool, &qb);
        execution.all().await
    }

    pub async fn first(&'a self) -> anyhow::Result<Option<T>> {
        let qb = self.query_by_limit(1);

        let execution = Execution::new(self.pool, &qb);
        execution.first().await
    }

    pub async fn all(&'a self) -> anyhow::Result<Vec<T>> {
        let qb = self.query_by_limit(500);

        let execution = Execution::new(self.pool, &qb);
        execution.all().await
    }
}