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Schema creation, validation with serialization and deserialization for input data

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parameter lib address.ex
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lib/address.ex 

# defmodule MyApp.Address do

#   use Ecto.Schema

#   import Ecto.Changeset



#   schema "addresses" do

#     field :city, :string

#     field :street, :string

#     field :number, :integer

#     belongs_to(:user, MyApp.User)

#   end



#   def changeset(user, params \\ %{}) do

#     user

#     |> cast(params, [:city, :street, :number])

#     |> validate_required([:city])

#   end

# end



# defmodule Address do

#   use Parameter.Schema

#   alias Parameter.Extensions.Changeset



#   param do

#     field :city, :string

#     field :street, :string

#     field :number, :integer

#   end



#   def changeset(params) do

#     Address

#     |> Changeset.cast(params)

#     |> Ecto.Changeset.validate_required(:city)

#     |> Ecto.Changeset.validate_required(:number)

#   end

# end