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70 lines
1.9 KiB
Elixir
70 lines
1.9 KiB
Elixir
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defmodule PhilomenaQuery.Ecto.QueryValidator do
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@moduledoc """
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Query string validation for Ecto.
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It enables the following usage pattern by taking a fn of the compiler:
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defmodule Filter do
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import PhilomenaQuery.Ecto.QueryValidator
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# ...
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def changeset(filter, attrs, user) do
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filter
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|> cast(attrs, [:complex])
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|> validate_required([:complex])
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|> validate_query([:complex], with: &Query.compile(&1, user: user))
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end
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end
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"""
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import Ecto.Changeset
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alias PhilomenaQuery.Parse.String
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@doc """
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Validates a query string using the provided attribute(s) and compiler.
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Returns the changeset as-is, or with an `"is invalid"` error added to validated field.
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## Examples
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# With single attribute
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filter
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|> cast(attrs, [:complex])
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|> validate_query(:complex, &Query.compile(&1, user: user))
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# With list of attributes
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filter
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|> cast(attrs, [:spoilered_complex, :hidden_complex])
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|> validate_query([:spoilered_complex, :hidden_complex], &Query.compile(&1, user: user))
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"""
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def validate_query(changeset, attr_or_attr_list, callback)
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def validate_query(changeset, attr_list, callback) when is_list(attr_list) do
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Enum.reduce(attr_list, changeset, fn attr, changeset ->
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validate_query(changeset, attr, callback)
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end)
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end
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def validate_query(changeset, attr, callback) do
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if changed?(changeset, attr) do
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validate_assuming_changed(changeset, attr, callback)
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else
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changeset
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end
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end
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defp validate_assuming_changed(changeset, attr, callback) do
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with value when is_binary(value) <- fetch_change!(changeset, attr) || "",
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value <- String.normalize(value),
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{:ok, _} <- callback.(value) do
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changeset
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else
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_ ->
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add_error(changeset, attr, "is invalid")
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end
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end
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end
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