c3p0 v0.3.1 C3P0.ID protocol View Source
Formalizes fetching the ID from data.
For maps the keys id
, "id"
are considered id fields and guid
, "guid"
are considered guid fields.
When requesting a guid, if one cannot be found by default it will fall back to the id.
Using with your own structs
By default your own structs will behave the same way as a map. However if you need to redefine which field should be considered the id/guid fields you'll need to derive the protocol.
defmodule MyStruct do
@derive {C3P0.ID, id_field: :token, guid_field: :arn}
defstruct [:token, :arn, :name]
end
Link to this section Summary
Link to this section Types
Link to this section Functions
Find a global id for a piece of data
Find the id of a piece of data