ETS-backed storage for Coupon resources.
Uses the shared store pattern via use PaperTiger.Store which provides:
- GenServer wraps ETS table
- Reads go directly to ETS (concurrent, fast)
- Writes go through GenServer (serialized, safe)
Architecture
- ETS Table:
:paper_tiger_coupons(public, read_concurrency: true) - GenServer: Serializes writes, handles initialization
- Shared Implementation: All CRUD operations via PaperTiger.Store
Examples
# Direct read (no GenServer bottleneck)
{:ok, coupon} = PaperTiger.Store.Coupons.get("coupon_123")
# Serialized write
coupon = %{id: "coupon_123", percent_off: 25, ...}
{:ok, coupon} = PaperTiger.Store.Coupons.insert(coupon)
# Query helpers (direct ETS access)
active_coupons = PaperTiger.Store.Coupons.find_active()Summary
Functions
Returns a specification to start this module under a supervisor.
Clears all coupons from the store (all namespaces).
Clears all coupons for a specific namespace.
Counts total coupons in current namespace.
Deletes a coupon from the store.
Finds active coupons.
Retrieves a coupon by ID.
Inserts a coupon into the store.
Lists all coupons with optional pagination.
Returns all items in a specific namespace.
Returns the ID prefix for this resource.
Starts the coupon store GenServer.
Returns the ETS table name for this store.
Updates a coupon in the store.
Functions
Returns a specification to start this module under a supervisor.
See Supervisor.
@spec clear() :: :ok
Clears all coupons from the store (all namespaces).
Serialized write - goes through GenServer.
Useful for test cleanup. Note: This clears ALL data, not just
the current namespace. For namespace-specific cleanup, use
clear_namespace/1.
@spec clear_namespace(pid() | :global) :: :ok
Clears all coupons for a specific namespace.
Used by PaperTiger.Test to clean up after each test.
@spec count() :: non_neg_integer()
Counts total coupons in current namespace.
Direct ETS access - does not go through GenServer.
@spec delete(String.t()) :: :ok
Deletes a coupon from the store.
Serialized write - goes through GenServer. Data is scoped to the current test namespace.
@spec find_active() :: [map()]
Finds active coupons.
Direct ETS access - does not go through GenServer.
Retrieves a coupon by ID.
Direct ETS access - does not go through GenServer. Data is scoped to the current test namespace.
Inserts a coupon into the store.
Serialized write - goes through GenServer to prevent race conditions. Data is scoped to the current test namespace.
@spec list(keyword() | map()) :: PaperTiger.List.t()
Lists all coupons with optional pagination.
Direct ETS access - does not go through GenServer. Data is scoped to the current test namespace.
Options
:limit- Number of items (default: 10, max: 100):starting_after- Cursor for pagination:ending_before- Reverse cursor
Returns all items in a specific namespace.
Useful for debugging test isolation.
@spec prefix() :: String.t() | nil
Returns the ID prefix for this resource.
@spec start_link(keyword()) :: GenServer.on_start()
Starts the coupon store GenServer.
@spec table_name() :: atom()
Returns the ETS table name for this store.
Updates a coupon in the store.
Serialized write - goes through GenServer. Data is scoped to the current test namespace.