Struct CascadeMetadata 

pub struct CascadeMetadata { /* private fields */ }

Maps mutation names to the entity types they modify.

Built from compiled schema, this metadata enables determining which entities are affected by each mutation operation.

Implementations

impl CascadeMetadata

pub fn new() -> Self

Create empty cascade metadata.

Useful when building metadata programmatically or in tests.

pub fn add_mutation(&mut self, mutation_name: &str, entity_type: &str)

Add a mutation-to-entity mapping.

Arguments

• mutation_name - Name of the mutation (e.g., “createUser”)
• entity_type - Type of entity it modifies (e.g., “User”)

pub fn get_entity_type(&self, mutation_name: &str) -> Option<&str>

Get the entity type modified by a mutation.

Arguments

• mutation_name - Name of the mutation

Returns

• Some(&str) - Entity type if mutation is known
• None - If mutation is not in schema

Examples

let entity = metadata.get_entity_type("createUser");
assert_eq!(entity, Some("User"));

pub fn get_mutations_for_entity(&self, entity_type: &str) -> Vec<String>

Get all mutations affecting a specific entity type.

Useful for finding all caches that might be affected by changes to an entity type.

Arguments

• entity_type - Type of entity to query

Returns

List of mutation names affecting this entity, or empty list if none

pub fn count(&self) -> usize

Get total number of mutation-entity mappings.

pub fn contains_mutation(&self, mutation_name: &str) -> bool

Check if metadata contains a mutation.

Trait Implementations

impl Clone for CascadeMetadata

fn clone(&self) -> CascadeMetadata

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for CascadeMetadata

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

Formats the value using the given formatter.

impl Default for CascadeMetadata

fn default() -> Self

Returns the “default value” for a type.