icydb_core/db/query/fluent/
delete.rs

1use crate::{
2    db::{
3        DbSession,
4        query::{
5            explain::ExplainPlan,
6            expr::{FilterExpr, SortExpr},
7            intent::{Query, QueryError},
8            plan::lowering::ExecutablePlan,
9            predicate::Predicate,
10        },
11        response::Response,
12    },
13    traits::{EntityKind, EntityValue, SingletonEntity},
14    types::Id,
15};
16
17///
18/// FluentDeleteQuery
19///
20/// Session-bound delete query wrapper.
21/// This type owns *intent construction* and *execution routing only*.
22/// All result projection and cardinality handling lives on `Response<E>`.
23///
24
25pub struct FluentDeleteQuery<'a, E>
26where
27    E: EntityKind,
28{
29    session: &'a DbSession<E::Canister>,
30    query: Query<E>,
31}
32
33impl<'a, E> FluentDeleteQuery<'a, E>
34where
35    E: EntityKind,
36{
37    pub(crate) const fn new(session: &'a DbSession<E::Canister>, query: Query<E>) -> Self {
38        Self { session, query }
39    }
40
41    // ------------------------------------------------------------------
42    // Intent inspection
43    // ------------------------------------------------------------------
44
45    #[must_use]
46    pub const fn query(&self) -> &Query<E> {
47        &self.query
48    }
49
50    // ------------------------------------------------------------------
51    // Intent builders (pure)
52    // ------------------------------------------------------------------
53
54    /// Set the access path to a single typed primary-key value.
55    ///
56    /// `Id<E>` is treated as a plain query input value here. It does not grant access.
57    #[must_use]
58    pub fn by_id(mut self, id: Id<E>) -> Self {
59        self.query = self.query.by_id(id.key());
60        self
61    }
62
63    /// Set the access path to multiple typed primary-key values.
64    ///
65    /// IDs are public and may come from untrusted input sources.
66    #[must_use]
67    pub fn by_ids<I>(mut self, ids: I) -> Self
68    where
69        I: IntoIterator<Item = Id<E>>,
70    {
71        self.query = self.query.by_ids(ids.into_iter().map(|id| id.key()));
72        self
73    }
74
75    // ------------------------------------------------------------------
76    // Query Refinement
77    // ------------------------------------------------------------------
78
79    #[must_use]
80    pub fn filter(mut self, predicate: Predicate) -> Self {
81        self.query = self.query.filter(predicate);
82        self
83    }
84
85    pub fn filter_expr(mut self, expr: FilterExpr) -> Result<Self, QueryError> {
86        self.query = self.query.filter_expr(expr)?;
87        Ok(self)
88    }
89
90    pub fn sort_expr(mut self, expr: SortExpr) -> Result<Self, QueryError> {
91        self.query = self.query.sort_expr(expr)?;
92        Ok(self)
93    }
94
95    #[must_use]
96    pub fn order_by(mut self, field: impl AsRef<str>) -> Self {
97        self.query = self.query.order_by(field);
98        self
99    }
100
101    #[must_use]
102    pub fn order_by_desc(mut self, field: impl AsRef<str>) -> Self {
103        self.query = self.query.order_by_desc(field);
104        self
105    }
106
107    #[must_use]
108    pub fn limit(mut self, limit: u32) -> Self {
109        self.query = self.query.limit(limit);
110        self
111    }
112
113    // ------------------------------------------------------------------
114    // Planning / diagnostics
115    // ------------------------------------------------------------------
116
117    pub fn explain(&self) -> Result<ExplainPlan, QueryError> {
118        self.query.explain()
119    }
120
121    pub fn plan(&self) -> Result<ExecutablePlan<E>, QueryError> {
122        self.query.plan()
123    }
124
125    // ------------------------------------------------------------------
126    // Execution (minimal core surface)
127    // ------------------------------------------------------------------
128
129    /// Execute this delete using the session's policy settings.
130    ///
131    /// All result inspection and projection is performed on `Response<E>`.
132    pub fn execute(&self) -> Result<Response<E>, QueryError>
133    where
134        E: EntityValue,
135    {
136        self.session.execute_query(self.query())
137    }
138
139    /// Execute and return whether any rows were affected.
140    pub fn is_empty(&self) -> Result<bool, QueryError>
141    where
142        E: EntityValue,
143    {
144        Ok(self.execute()?.is_empty())
145    }
146
147    /// Execute and return the number of affected rows.
148    pub fn count(&self) -> Result<u32, QueryError>
149    where
150        E: EntityValue,
151    {
152        Ok(self.execute()?.count())
153    }
154
155    /// Execute and require exactly one affected row.
156    pub fn require_one(&self) -> Result<(), QueryError>
157    where
158        E: EntityValue,
159    {
160        self.execute()?.require_one()?;
161        Ok(())
162    }
163
164    /// Execute and require at least one affected row.
165    pub fn require_some(&self) -> Result<(), QueryError>
166    where
167        E: EntityValue,
168    {
169        self.execute()?.require_some()?;
170        Ok(())
171    }
172}
173
174impl<E> FluentDeleteQuery<'_, E>
175where
176    E: EntityKind + SingletonEntity,
177    E::Key: Default,
178{
179    /// Delete the singleton entity.
180    #[must_use]
181    pub fn only(mut self) -> Self {
182        self.query = self.query.only();
183        self
184    }
185}
icydb_core/db/query/fluent/delete.rs

icydb_core/db/query/fluent/
delete.rs
