Struct ChangeTracker 

pub struct ChangeTracker { /* private fields */ }

Tracks changes to entities within a DbContext.

Implementations

impl ChangeTracker

pub fn new() -> Self

pub fn track_entity_with_snapshot( &mut self, type_id: TypeId, type_name: &str, state: EntityState, snapshot: HashMap<String, String>, ) -> u64

Takes a snapshot of the entity’s current properties and begins tracking.

The snapshotter closure should return a map of property-name �?string serialization of the property’s current value.

pub fn track_entity( &mut self, type_id: TypeId, type_name: &str, state: EntityState, ) -> u64

Begins tracking an entity without taking a snapshot (used for Added entities that have no pre-existing state).

pub fn detect_changes_with_properties( &mut self, current_properties: &[(u64, HashMap<String, String>)], )

Compares current property values (provided by the caller) against the stored snapshots. Any property whose value differs is marked as modified, and the entity transitions to EntityState::Modified.

pub fn update_snapshot( &mut self, entry_id: u64, properties: HashMap<String, String>, )

Marks the property snapshot for the given entry as updated. Used after a successful SaveChanges to update the “original” values.

pub fn has_changes(&self) -> bool

Returns whether any tracked entity has changes pending.

pub fn clear(&mut self)

Clears all tracked entities.

pub fn entries(&self) -> Vec<EntityEntry>

Returns an iterator over tracked entry views.

pub fn count_by_state(&self, state: EntityState) -> usize

Returns count of entities in a given state.

pub fn entries_by_state(&self, state: EntityState) -> Vec<EntityEntry>

Returns entities grouped by their state.

pub fn accept_all_changes(&mut self)

After successful SaveChanges:

• Added �?Unchanged (save snapshot)
• Modified �?Unchanged (save current as new snapshot)
• Deleted �?Detached (removed from tracker)

pub fn reject_all_changes(&mut self)

Reverts all pending changes (detached state reverted).

pub fn detach(&mut self, entry_id: u64)

Detaches a specific entry by ID.

pub fn is_auto_detect_changes_enabled(&self) -> bool

pub fn set_auto_detect_changes(&mut self, enabled: bool)

Trait Implementations

impl Debug for ChangeTracker

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for ChangeTracker

fn default() -> Self

Returns the “default value” for a type.