teaql_runtime/
entity_save.rs

1use std::collections::BTreeSet;
2use std::future::Future;
3use std::marker::PhantomData;
4use std::pin::Pin;
5use std::sync::Arc;
6
7use teaql_core::{Entity, Record, Value};
8
9use crate::{DataServiceError, GraphNode, GraphOperation, RuntimeError, UserContext};
10
11// ---------------------------------------------------------------------------
12// DynGraphSaver — type-erased graph save capability
13// ---------------------------------------------------------------------------
14
15/// Object-safe trait for saving a [`GraphNode`] tree to the database.
16///
17/// A concrete implementation is registered in [`UserContext`] during setup so
18/// that [`Audited::save`] can persist entities without exposing the underlying
19/// executor type to business code.
20pub(crate) trait DynGraphSaver: Send + Sync {
21    fn save_graph_dyn<'a>(
22        &'a self,
23        ctx: &'a UserContext,
24        node: GraphNode,
25    ) -> Pin<Box<dyn Future<Output = Result<GraphNode, RuntimeError>> + Send + 'a>>;
26
27    fn save_ledger_dyn<'a>(
28        &'a self,
29        ctx: &'a UserContext,
30        node: GraphNode,
31        root: crate::EntityRoot,
32    ) -> Pin<Box<dyn Future<Output = Result<GraphNode, RuntimeError>> + Send + 'a>>;
33}
34
35/// Marker struct that implements [`DynGraphSaver`] for a specific executor type `E`.
36///
37/// `E` is the full executor type (e.g. `SqlDataServiceExecutor<SqliteDialect, …>`).
38/// The struct itself is zero-sized; the actual executor is retrieved from
39/// [`UserContext`] at call time.
40pub(crate) struct GraphSaverFor<E> {
41    _marker: PhantomData<fn() -> E>,
42}
43
44impl<E> GraphSaverFor<E> {
45    pub(crate) fn new() -> Self {
46        Self {
47            _marker: PhantomData,
48        }
49    }
50}
51
52impl<E> DynGraphSaver for GraphSaverFor<E>
53where
54    E: teaql_data_service::QueryExecutor
55        + teaql_data_service::MutationExecutor
56        + Send
57        + Sync
58        + 'static,
59{
60    fn save_graph_dyn<'a>(
61        &'a self,
62        ctx: &'a UserContext,
63        node: GraphNode,
64    ) -> Pin<Box<dyn Future<Output = Result<GraphNode, RuntimeError>> + Send + 'a>> {
65        Box::pin(async move {
66            let entity = node.entity.clone();
67            let eds = ctx
68                .entity_data_service::<E>(entity)
69                .map_err(|e| RuntimeError::Graph(e.to_string()))?;
70            eds.save_graph_internal(node).await.map_err(|e| match e {
71                DataServiceError::Runtime(r) => r,
72                other => RuntimeError::Graph(other.to_string()),
73            })
74        })
75    }
76
77    fn save_ledger_dyn<'a>(
78        &'a self,
79        ctx: &'a UserContext,
80        mut node: GraphNode,
81        root: crate::EntityRoot,
82    ) -> Pin<Box<dyn Future<Output = Result<GraphNode, RuntimeError>> + Send + 'a>> {
83        Box::pin(async move {
84            let entity = node.entity.clone();
85            let eds = ctx
86                .entity_data_service::<E>(&entity)
87                .map_err(|e| RuntimeError::Graph(e.to_string()))?;
88            let generated_ids =
89                eds.execute_ledger_plan_internal(root)
90                    .await
91                    .map_err(|e| match e {
92                        DataServiceError::Runtime(r) => r,
93                        other => RuntimeError::Graph(other.to_string()),
94                    })?;
95
96            let descriptor = ctx.require_entity(&entity).unwrap();
97            if let Some(id_prop) = descriptor.id_property() {
98                let current_id = node
99                    .values
100                    .get(&id_prop.name)
101                    .cloned()
102                    .unwrap_or(Value::I64(0));
103                let root_key = crate::EntityKey::new(entity.clone(), current_id);
104                if let Some(new_id) = generated_ids.get(&root_key) {
105                    node.values.insert(id_prop.name.clone(), new_id.clone());
106                }
107            }
108            Ok(node)
109        })
110    }
111}
112
113// ---------------------------------------------------------------------------
114// Standalone graph-node extraction (no executor needed)
115// ---------------------------------------------------------------------------
116
117/// Convert a typed entity into a [`GraphNode`] tree.
118///
119/// This only requires metadata (entity descriptors) from the [`UserContext`],
120/// **not** the database executor.  It is the standalone equivalent of
121/// [`EntityDataService::graph_node_from_entity`].
122pub fn graph_node_from_entity<T: Entity>(
123    ctx: &UserContext,
124    entity: T,
125) -> Result<GraphNode, RuntimeError> {
126    let descriptor = T::entity_descriptor();
127    let dirty_fields = entity.dirty_fields();
128    let original_values = entity.original_values();
129    let is_deleted = entity.is_marked_as_delete();
130    let comment = entity.get_comment();
131    let mut node = graph_node_from_record(ctx, &descriptor.name, entity.into_record())?;
132    node.dirty_fields = dirty_fields;
133    node.original_values = original_values;
134    if is_deleted {
135        node.operation = GraphOperation::Remove;
136        node.relations.clear();
137    }
138    if let Some(c) = comment {
139        node.set_comment(c);
140    }
141    Ok(node)
142}
143
144/// Recursively convert a [`Record`] into a [`GraphNode`] tree.
145///
146/// Relations are resolved via the entity descriptors stored in `ctx`.
147fn graph_node_from_record(
148    ctx: &UserContext,
149    entity: &str,
150    record: Record,
151) -> Result<GraphNode, RuntimeError> {
152    let descriptor = ctx.require_entity(entity)?;
153    let mut node = GraphNode::new(entity);
154
155    for (field, value) in record {
156        if field == "_comment" {
157            if let Value::Text(comment) = value {
158                node.set_comment(comment);
159            }
160            continue;
161        }
162        if field == "_dirty_fields" {
163            if let Value::List(fields) = value {
164                let mut dirty = BTreeSet::new();
165                for f in fields {
166                    if let Value::Text(t) = f {
167                        dirty.insert(t);
168                    }
169                }
170                node.dirty_fields = Some(dirty);
171            }
172            continue;
173        }
174        if field == "_original_values" {
175            if let Value::Object(orig) = value {
176                node.original_values = Some(orig);
177            }
178            continue;
179        }
180        let Some(relation) = descriptor.relation_by_name(&field) else {
181            node.values.insert(field, value);
182            continue;
183        };
184
185        match value {
186            Value::Null => {
187                node.relations.entry(field).or_default();
188            }
189            Value::Object(record) => {
190                let child = graph_node_from_record(ctx, &relation.target_entity, record)?;
191                node.relations.entry(field).or_default().push(child);
192            }
193            Value::List(values) => {
194                let children = node.relations.entry(field.clone()).or_default();
195                for value in values {
196                    let Value::Object(record) = value else {
197                        return Err(RuntimeError::Graph(format!(
198                            "relation {}.{} expects object children, got {:?}",
199                            entity, field, value
200                        )));
201                    };
202                    children.push(graph_node_from_record(
203                        ctx,
204                        &relation.target_entity,
205                        record,
206                    )?);
207                }
208            }
209            other => {
210                return Err(RuntimeError::Graph(format!(
211                    "relation {}.{} expects object/list/null, got {:?}",
212                    entity, field, other
213                )));
214            }
215        }
216    }
217
218    Ok(node)
219}
220
221// ---------------------------------------------------------------------------
222// AuditedSaveExt — the `.save(&ctx)` method on `Audited<T>`
223// ---------------------------------------------------------------------------
224
225/// Extension trait that provides the `.save(&ctx)` method on [`Audited<T>`](teaql_core::Audited).
226///
227/// # Example
228/// ```ignore
229/// use teaql_runtime::AuditedSaveExt;
230///
231/// school.audit_as("创建学校").save(&ctx).await?;
232/// ```
233pub trait AuditedSaveExt {
234    type Entity;
235
236    fn save<'a>(
237        self,
238        ctx: &'a UserContext,
239    ) -> Pin<Box<dyn Future<Output = Result<Self::Entity, RuntimeError>> + Send + 'a>>;
240}
241
242impl<T> AuditedSaveExt for teaql_core::Audited<T>
243where
244    T: Entity + Send + 'static,
245{
246    type Entity = T;
247
248    fn save<'a>(
249        self,
250        ctx: &'a UserContext,
251    ) -> Pin<Box<dyn Future<Output = Result<Self::Entity, RuntimeError>> + Send + 'a>> {
252        Box::pin(async move {
253            let entity_name = T::entity_descriptor().name;
254            let entity = self.into_entity(); // applies comment onto the entity
255            let node = graph_node_from_entity(ctx, entity)?;
256            let saver = ctx
257                .require_resource::<Arc<dyn DynGraphSaver>>()
258                .map_err(|e| {
259                    RuntimeError::Graph(format!(
260                        "no DynGraphSaver registered — did you call register_executor()? ({})",
261                        e
262                    ))
263                })?;
264            let saved = saver.save_graph_dyn(ctx, node).await?;
265            T::from_record(saved.values).map_err(|e| RuntimeError::Graph(e.to_string()))
266        })
267    }
268}
269
270/// Persist an audited generated entity, including pending ledger changes that
271/// may span multiple related entities sharing the same [`EntityRoot`](crate::EntityRoot).
272///
273/// Generated service crates use this as the implementation behind
274/// `entity.audit_as("why").save(&ctx)`. The audited wrapper is required by the
275/// function signature; no unaudited entity write entry point is exposed.
276#[doc(hidden)]
277pub async fn save_audited_ledger_entity<T>(
278    audited: teaql_core::Audited<T>,
279    ctx: &UserContext,
280) -> Result<T, RuntimeError>
281where
282    T: crate::LedgerEntity + Send + 'static,
283{
284    let entity_name = T::entity_descriptor().name;
285    let entity = audited.into_entity();
286    let root = entity.entity_root();
287    let node = graph_node_from_entity(ctx, entity)?;
288    let saver = ctx
289        .require_resource::<Arc<dyn DynGraphSaver>>()
290        .map_err(|e| {
291            RuntimeError::Graph(format!(
292                "no DynGraphSaver registered — did you call register_executor()? ({e})"
293            ))
294        })?;
295
296    if let Some(root) = root {
297        let has_ledger_changes = !root.current_change_set().changes().is_empty()
298            || !root.deleted_keys().is_empty()
299            || !root.new_keys().is_empty();
300        if has_ledger_changes {
301            let saved = saver.save_ledger_dyn(ctx, node, root).await?;
302            return T::from_record(saved.values).map_err(|e| RuntimeError::Graph(e.to_string()));
303        }
304    }
305
306    let saved = saver.save_graph_dyn(ctx, node).await?;
307    T::from_record(saved.values).map_err(|e| RuntimeError::Graph(e.to_string()))
308}
teaql_runtime/entity_save.rs

teaql_runtime/
entity_save.rs
