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Data mapper and and DSL for writing queries and interacting with PostgreSQL databases in Erlang

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repo src repo_model.erl
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src/repo_model.erl 

-module(repo_model).



-callback schema() -> q:schema().



-callback before_save(epgpool:connection(), Model, HookOpts :: any()) -> {ok, Model} | {error, Reason :: any()}.

-optional_callbacks([before_save/3]).



-callback after_save(epgpool:connection(), OldModel :: any(), NewModel, HookOpts :: any()) -> NewModel.

-optional_callbacks([after_save/4]).



-callback before_delete(epgpool:connection(), q:query(), HookOpts :: any()) -> {ok, q:query()} | {error, Reason :: any()}.

-optional_callbacks([before_delete/3]).



-callback after_delete(epgpool:connection(), DeletedModel :: any(), HookOpts :: any()) -> Model :: any().

-optional_callbacks([after_delete/3]).



-callback from_db([FieldNames :: atom()]) -> fun((Data :: [any()]) -> Model :: any()).

-optional_callbacks([from_db/1]).



-callback to_db(Model :: any()) -> DbModel :: #{ atom() => any() }.

-optional_callbacks([to_db/1]).



-export([

         before_save/3,

         after_save/4,

         before_delete/3,

         after_delete/3,

         from_db/1,

         to_db/1

        ]).



before_save(_C, Model, _HookOpts) -> {ok, Model}.

after_save(_C, _BeforeModel, AfterModel, _HookOpts) -> AfterModel.



before_delete(_C, Q, _HookOpts) -> {ok, Q}.

after_delete(_C, DeletedModel, _HookOpts) -> DeletedModel.



from_db(Fields) -> fun(Values) -> maps:from_list(lists:zip(Fields, Values)) end.



to_db(Model) -> Model.