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 = "Option::is_none")]
16    pub external: Option<&'static str>,
17
18    #[serde(default, skip_serializing_if = "<[_]>::is_empty")]
19    pub validators: &'static [TypeValidator],
20
21    #[serde(default, skip_serializing_if = "<[_]>::is_empty")]
22    pub sanitizers: &'static [TypeSanitizer],
23
24    #[serde(default, skip_serializing_if = "Not::not")]
25    pub indirect: bool,
26}
27
28impl Item {
29    #[must_use]
30    pub const fn is_relation(&self) -> bool {
31        self.relation.is_some()
32    }
33}
34
35impl ValidateNode for Item {
36    fn validate(&self) -> Result<(), ErrorTree> {
37        let mut errs = ErrorTree::new();
38        let schema = schema_read();
39
40        // Phase 1: enforce option constraints.
41        if self.relation.is_some() && self.external.is_some() {
42            err!(errs, "an Item cannot specify both rel and ext");
43        }
44
45        // Phase 2: validate target shape.
46        match &self.target {
47            ItemTarget::Is(path) => {
48                // cannot be an entity
49                if schema.check_node_as::<Entity>(path).is_ok() {
50                    err!(errs, "a non-relation Item cannot reference an Entity");
51                }
52            }
53
54            ItemTarget::Primitive(_) => {}
55        }
56
57        // Phase 3: validate relation target compatibility.
58        if let Some(relation) = &self.relation {
59            // Step 1: Ensure the relation path exists and is an Entity
60            match schema.cast_node::<Entity>(relation) {
61                Ok(entity) => {
62                    // Step 2: Get target of the relation entity (usually from its primary key field)
63                    if let Some(primary_field) = entity.get_pk_field() {
64                        let relation_target = &primary_field.value.item.target;
65
66                        // Step 3: Compare to self.target()
67                        if &self.target != relation_target {
68                            err!(
69                                errs,
70                                "relation target type mismatch: expected {:?}, found {:?}",
71                                relation_target,
72                                self.target
73                            );
74                        }
75                    } else {
76                        err!(
77                            errs,
78                            "relation entity '{relation}' missing primary key field '{0}'",
79                            entity.primary_key
80                        );
81                    }
82                }
83                Err(_) => {
84                    err!(errs, "relation entity '{relation}' not found");
85                }
86            }
87        }
88
89        errs.result()
90    }
91}
92
93impl VisitableNode for Item {
94    fn drive<V: Visitor>(&self, v: &mut V) {
95        for node in self.validators {
96            node.accept(v);
97        }
98    }
99}
100
101///
102/// ItemTarget
103///
104
105#[derive(Clone, Debug, Eq, PartialEq, Serialize)]
106pub enum ItemTarget {
107    Is(&'static str),
108    Primitive(Primitive),
109}
icydb_schema/node/item.rs

icydb_schema/node/
item.rs
