Ecto.Association.HasThrough (Ecto v3.7.1) View Source
The association struct for has_one and has_many through associations.
Its fields are:
cardinality- The association cardinalityfield- The name of the association field on the schemaowner- The schema where the association was definedowner_key- The key on theownerschema used for the associationthrough- The through associationsrelationship- The relationship to the specified schema, default:child