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Created September 6, 2017 03:24
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programming phoenix ch 9
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programming_phoenix_ch_9.md

Programming Phoenix: Chapter 9

Brunch

  • build tool
  • interface for player

Changeset Benefits

  • separate policy for each type of change
  • filter / cast incoming data
  • validate data (length or format)
  • composable

Extending Phoenix with Protocols

  • Phoenix defines protocol Phoenix.Param, which extracts id of struct if exists
  • Elixir protocols can be implemented for any data structure anywhere
  • "overwriting" the to_param function to customize it for path helper

Extending Schemas with Ecto Types

  • custom type, allows you to associate some behavior to id fields
  • custom type defined according to Ecto.Type behavior
  • expects you to define four functions:
    • type: underlying ecto type
    • cast: called when external data passed into Ecto
    • dump: invoked when data sent to db
    • load: invoked when data loaded
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