icydb_schema/node/
item.rs

1use crate::prelude::*;
2use std::ops::Not;
3
4///
5/// Item
6///
7
8#[derive(Clone, Debug, Serialize)]
9pub struct Item {
10    pub target: ItemTarget,
11
12    #[serde(default, skip_serializing_if = "Option::is_none")]
13    pub relation: Option<&'static str>,
14
15    #[serde(default, skip_serializing_if = "<[_]>::is_empty")]
16    pub validators: &'static [TypeValidator],
17
18    #[serde(default, skip_serializing_if = "<[_]>::is_empty")]
19    pub sanitizers: &'static [TypeSanitizer],
20
21    #[serde(default, skip_serializing_if = "Not::not")]
22    pub indirect: bool,
23}
24
25impl Item {
26    #[must_use]
27    pub const fn is_relation(&self) -> bool {
28        self.relation.is_some()
29    }
30}
31
32impl ValidateNode for Item {
33    fn validate(&self) -> Result<(), ErrorTree> {
34        let mut errs = ErrorTree::new();
35        let schema = schema_read();
36
37        match &self.target {
38            ItemTarget::Is(path) => {
39                // cannot be an entity
40                if schema.check_node_as::<Entity>(path).is_ok() {
41                    err!(errs, "a non-relation Item cannot reference an Entity");
42                }
43            }
44
45            ItemTarget::Primitive(_) => {}
46        }
47
48        // relation
49        if let Some(relation) = &self.relation {
50            if self.indirect {
51                err!(errs, "relations cannot be set to indirect");
52            }
53
54            // Step 1: Ensure the relation path exists and is an Entity
55            match schema.cast_node::<Entity>(relation) {
56                Ok(entity) => {
57                    // Step 2: Get target of the relation entity (usually from its primary key field)
58                    let primary_field = entity.get_pk_field();
59                    let relation_target = &primary_field.value.item.target;
60
61                    // Step 3: Compare to self.target()
62                    if &self.target != relation_target {
63                        err!(
64                            errs,
65                            "relation target type mismatch: expected {:?}, found {:?}",
66                            relation_target,
67                            self.target
68                        );
69                    }
70                }
71                Err(_) => {
72                    err!(errs, "relation entity '{relation}' not found");
73                }
74            }
75        }
76
77        errs.result()
78    }
79}
80
81impl VisitableNode for Item {
82    fn drive<V: Visitor>(&self, v: &mut V) {
83        for node in self.validators {
84            node.accept(v);
85        }
86    }
87}
88
89///
90/// ItemTarget
91///
92
93#[derive(Clone, Debug, Eq, PartialEq, Serialize)]
94pub enum ItemTarget {
95    Is(&'static str),
96    Primitive(Primitive),
97}
icydb_schema/node/item.rs

icydb_schema/node/
item.rs
