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type.ex
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defmodule Ecto.Type do
@moduledoc """
Defines functions and the `Ecto.Type` behaviour for implementing
custom types.
A custom type expects 4 functions to be implemented, all documented
and described below. We also provide two examples of how custom
types can be used in Ecto to augment existing types or providing
your own types.
## Example
Imagine you want to store an URI struct as part of a schema in an
url-shortening service. There isn't an Ecto field type to support
that value at runtime, therefore a custom one is needed.
You also want to query not only by the full url, but for example
by specific ports used. This is possible by putting the URI data
into a map field instead of just storing the plain
string representation.
from s in ShortUrl,
where: fragment("?->>? ILIKE ?", s.original_url, "port", "443")
So the custom type does need to handle the conversion from
external data to runtime data (`c:cast/1`) as well as
transforming that runtime data into the `:map` Ecto native type and
back (`c:dump/1` and `c:load/1`).
defmodule EctoURI do
@behaviour Ecto.Type
def type, do: :map
# Provide custom casting rules.
# Cast strings into the URI struct to be used at runtime
def cast(uri) when is_binary(uri) do
{:ok, URI.parse(uri)}
end
# Accept casting of URI structs as well
def cast(%URI{} = uri), do: {:ok, uri}
# Everything else is a failure though
def cast(_), do: :error
# When loading data from the database, we are guaranteed to
# receive a map (as databases are strict) and we will
# just put the data back into an URI struct to be stored
# in the loaded schema struct.
def load(data) when is_map(data) do
data =
for {key, val} <- data do
{String.to_existing_atom(key), val}
end
{:ok, struct!(URI, data)}
end
# When dumping data to the database, we *expect* an URI struct
# but any value could be inserted into the schema struct at runtime,
# so we need to guard against them.
def dump(%URI{} = uri), do: {:ok, Map.from_struct(uri)}
def dump(_), do: :error
end
Now we can use our new field type above in our schemas:
defmodule ShortUrl do
use Ecto.Schema
schema "posts" do
field :original_url, EctoURI
end
end
"""
import Kernel, except: [match?: 2]
@typedoc "An Ecto type, primitive or custom."
@type t :: primitive | custom
@typedoc "Primitive Ecto types (handled by Ecto)."
@type primitive :: base | composite
@typedoc "Custom types are represented by user-defined modules."
@type custom :: atom
@typep base :: :integer | :float | :boolean | :string | :map |
:binary | :decimal | :id | :binary_id |
:utc_datetime | :naive_datetime | :date | :time | :any
@typep composite :: {:array, t} | {:map, t} | {:embed, Ecto.Embedded.t} | {:in, t}
@base ~w(integer float boolean string binary decimal datetime utc_datetime naive_datetime date time id binary_id map any)a
@composite ~w(array map in embed)a
@doc """
Returns the underlying schema type for the custom type.
For example, if you want to provide your own date
structures, the type function should return `:date`.
Note this function is not required to return Ecto primitive
types, the type is only required to be known by the adapter.
"""
@callback type :: t
@doc """
Casts the given input to the custom type.
This callback is called on external input and can return any type,
as long as the `dump/1` function is able to convert the returned
value into an Ecto native type. There are two situations where
this callback is called:
1. When casting values by `Ecto.Changeset`
2. When passing arguments to `Ecto.Query`
"""
@callback cast(term) :: {:ok, term} | :error
@doc """
Loads the given term into a custom type.
This callback is called when loading data from the database and
receive an Ecto native type. It can return any type, as long as
the `dump/1` function is able to convert the returned value back
into an Ecto native type.
"""
@callback load(term) :: {:ok, term} | :error
@doc """
Dumps the given term into an Ecto native type.
This callback is called with any term that was stored in the struct
and it needs to validate them and convert it to an Ecto native type.
"""
@callback dump(term) :: {:ok, term} | :error
## Functions
@doc """
Checks if we have a primitive type.
iex> primitive?(:string)
true
iex> primitive?(Another)
false
iex> primitive?({:array, :string})
true
iex> primitive?({:array, Another})
true
"""
@spec primitive?(t) :: boolean
def primitive?({composite, _}) when composite in @composite, do: true
def primitive?(base) when base in @base, do: true
def primitive?(_), do: false
@doc """
Checks if the given atom can be used as composite type.
iex> composite?(:array)
true
iex> composite?(:string)
false
"""
@spec composite?(atom) :: boolean
def composite?(atom), do: atom in @composite
@doc """
Checks if the given atom can be used as base type.
iex> base?(:string)
true
iex> base?(:array)
false
iex> base?(Custom)
false
"""
@spec base?(atom) :: boolean
def base?(atom), do: atom in @base
@doc """
Retrieves the underlying schema type for the given, possibly custom, type.
iex> type(:string)
:string
iex> type(Ecto.UUID)
:uuid
iex> type({:array, :string})
{:array, :string}
iex> type({:array, Ecto.UUID})
{:array, :uuid}
iex> type({:map, Ecto.UUID})
{:map, :uuid}
"""
@spec type(t) :: t
def type(type)
def type({:array, type}), do: {:array, type(type)}
def type({:map, type}), do: {:map, type(type)}
def type(type) do
if primitive?(type) do
type
else
type.type
end
end
@doc """
Checks if a given type matches with a primitive type
that can be found in queries.
iex> match?(:string, :any)
true
iex> match?(:any, :string)
true
iex> match?(:string, :string)
true
iex> match?({:array, :string}, {:array, :any})
true
iex> match?(Ecto.UUID, :uuid)
true
iex> match?(Ecto.UUID, :string)
false
"""
@spec match?(t, primitive) :: boolean
def match?(schema_type, query_type) do
if primitive?(schema_type) do
do_match?(schema_type, query_type)
else
do_match?(schema_type.type, query_type)
end
end
defp do_match?(_left, :any), do: true
defp do_match?(:any, _right), do: true
defp do_match?({outer, left}, {outer, right}), do: match?(left, right)
defp do_match?({:array, :any}, {:embed, %{cardinality: :many}}), do: true
defp do_match?(:decimal, type) when type in [:float, :integer], do: true
defp do_match?(:binary_id, :binary), do: true
defp do_match?(:id, :integer), do: true
defp do_match?(type, type), do: true
defp do_match?(_, _), do: false
@doc """
Dumps a value to the given type.
Opposite to casting, dumping requires the returned value
to be a valid Ecto type, as it will be sent to the
underlying data store.
iex> dump(:string, nil)
{:ok, nil}
iex> dump(:string, "foo")
{:ok, "foo"}
iex> dump(:integer, 1)
{:ok, 1}
iex> dump(:integer, "10")
:error
iex> dump(:binary, "foo")
{:ok, "foo"}
iex> dump(:binary, 1)
:error
iex> dump({:array, :integer}, [1, 2, 3])
{:ok, [1, 2, 3]}
iex> dump({:array, :integer}, [1, "2", 3])
:error
iex> dump({:array, :binary}, ["1", "2", "3"])
{:ok, ["1", "2", "3"]}
A `dumper` function may be given for handling recursive types.
"""
@spec dump(t, term, (t, term -> {:ok, term} | :error)) :: {:ok, term} | :error
def dump(type, value, dumper \\ &dump/2)
def dump(_type, nil, _dumper) do
{:ok, nil}
end
def dump(:binary_id, value, _dumper) when is_binary(value) do
{:ok, value}
end
def dump(:any, value, _dumper) do
Ecto.DataType.dump(value)
end
def dump({:embed, embed}, value, dumper) do
dump_embed(embed, value, dumper)
end
def dump({:array, type}, value, dumper) when is_list(value) do
array(value, type, dumper, [])
end
def dump({:map, type}, value, dumper) when is_map(value) do
map(Map.to_list(value), type, dumper, %{})
end
def dump({:in, type}, value, dumper) do
case dump({:array, type}, value, dumper) do
{:ok, v} -> {:ok, {:in, v}}
:error -> :error
end
end
def dump(:decimal, term, _dumper) when is_number(term) do
{:ok, Decimal.new(term)}
end
def dump(:date, term, _dumper) do
dump_date(term)
end
def dump(:time, term, _dumper) do
dump_time(term)
end
def dump(:naive_datetime, term, _dumper) do
dump_naive_datetime(term)
end
def dump(:utc_datetime, term, _dumper) do
dump_utc_datetime(term)
end
def dump(type, value, _dumper) do
cond do
not primitive?(type) ->
type.dump(value)
of_base_type?(type, value) ->
{:ok, value}
true ->
:error
end
end
defp dump_embed(%{cardinality: :one, related: schema, field: field},
value, fun) when is_map(value) do
{:ok, dump_embed(field, schema, value, schema.__schema__(:dump), fun)}
end
defp dump_embed(%{cardinality: :many, related: schema, field: field},
value, fun) when is_list(value) do
types = schema.__schema__(:dump)
{:ok, Enum.map(value, &dump_embed(field, schema, &1, types, fun))}
end
defp dump_embed(_embed, _value, _fun) do
:error
end
defp dump_embed(_field, schema, %{__struct__: schema} = struct, types, dumper) do
Enum.reduce(types, %{}, fn {field, {source, type}}, acc ->
value = Map.get(struct, field)
case dumper.(type, value) do
{:ok, value} ->
Map.put(acc, source, value)
:error ->
raise ArgumentError, "cannot dump `#{inspect value}` as type #{inspect type} " <>
"for field `#{field}` in schema #{inspect schema}"
end
end)
end
defp dump_embed(field, _schema, value, _types, _fun) do
raise ArgumentError, "cannot dump embed `#{field}`, invalid value: #{inspect value}"
end
@doc """
Loads a value with the given type.
iex> load(:string, nil)
{:ok, nil}
iex> load(:string, "foo")
{:ok, "foo"}
iex> load(:integer, 1)
{:ok, 1}
iex> load(:integer, "10")
:error
A `loader` function may be given for handling recursive types.
"""
@spec load(t, term, (t, term -> {:ok, term} | :error)) :: {:ok, term} | :error
def load(type, value, loader \\ &load/2)
def load({:embed, embed}, value, loader) do
load_embed(embed, value, loader)
end
def load(_type, nil, _loader), do: {:ok, nil}
def load(:binary_id, value, _loader) when is_binary(value) do
{:ok, value}
end
def load({:array, type}, value, loader) when is_list(value) do
array(value, type, loader, [])
end
def load({:map, type}, value, loader) when is_map(value) do
map(Map.to_list(value), type, loader, %{})
end
def load(:date, term, _loader) do
load_date(term)
end
def load(:time, term, _loader) do
load_time(term)
end
def load(:naive_datetime, term, _loader) do
load_naive_datetime(term)
end
def load(:utc_datetime, term, _loader) do
load_utc_datetime(term)
end
def load(type, value, _loader) do
cond do
not primitive?(type) ->
type.load(value)
of_base_type?(type, value) ->
{:ok, value}
true ->
:error
end
end
defp load_embed(%{cardinality: :one}, nil, _fun), do: {:ok, nil}
defp load_embed(%{cardinality: :one, related: schema, field: field},
value, fun) when is_map(value) do
{:ok, load_embed(field, schema, value, fun)}
end
defp load_embed(%{cardinality: :many}, nil, _fun), do: {:ok, []}
defp load_embed(%{cardinality: :many, related: schema, field: field},
value, fun) when is_list(value) do
{:ok, Enum.map(value, &load_embed(field, schema, &1, fun))}
end
defp load_embed(_embed, _value, _fun) do
:error
end
defp load_embed(_field, schema, value, loader) when is_map(value) do
Ecto.Schema.__unsafe_load__(schema, value, loader)
end
defp load_embed(field, _schema, value, _fun) do
raise ArgumentError, "cannot load embed `#{field}`, invalid value: #{inspect value}"
end
@doc """
Casts a value to the given type.
`cast/2` is used by the finder queries and changesets
to cast outside values to specific types.
Note that nil can be cast to all primitive types as data
stores allow nil to be set on any column.
iex> cast(:any, "whatever")
{:ok, "whatever"}
iex> cast(:any, nil)
{:ok, nil}
iex> cast(:string, nil)
{:ok, nil}
iex> cast(:integer, 1)
{:ok, 1}
iex> cast(:integer, "1")
{:ok, 1}
iex> cast(:integer, "1.0")
:error
iex> cast(:id, 1)
{:ok, 1}
iex> cast(:id, "1")
{:ok, 1}
iex> cast(:id, "1.0")
:error
iex> cast(:float, 1.0)
{:ok, 1.0}
iex> cast(:float, 1)
{:ok, 1.0}
iex> cast(:float, "1")
{:ok, 1.0}
iex> cast(:float, "1.0")
{:ok, 1.0}
iex> cast(:float, "1-foo")
:error
iex> cast(:boolean, true)
{:ok, true}
iex> cast(:boolean, false)
{:ok, false}
iex> cast(:boolean, "1")
{:ok, true}
iex> cast(:boolean, "0")
{:ok, false}
iex> cast(:boolean, "whatever")
:error
iex> cast(:string, "beef")
{:ok, "beef"}
iex> cast(:binary, "beef")
{:ok, "beef"}
iex> cast(:decimal, Decimal.new(1.0))
{:ok, Decimal.new(1.0)}
iex> cast(:decimal, Decimal.new("1.0"))
{:ok, Decimal.new(1.0)}
iex> cast({:array, :integer}, [1, 2, 3])
{:ok, [1, 2, 3]}
iex> cast({:array, :integer}, ["1", "2", "3"])
{:ok, [1, 2, 3]}
iex> cast({:array, :string}, [1, 2, 3])
:error
iex> cast(:string, [1, 2, 3])
:error
"""
@spec cast(t, term) :: {:ok, term} | :error
def cast({:embed, type}, value) do
cast_embed(type, value)
end
def cast({:in, _type}, nil), do: :error
def cast(_type, nil), do: {:ok, nil}
def cast(:binary_id, value) when is_binary(value) do
{:ok, value}
end
def cast({:array, type}, term) when is_list(term) do
array(term, type, &cast/2, [])
end
def cast({:map, type}, term) when is_map(term) do
map(Map.to_list(term), type, &cast/2, %{})
end
def cast({:in, type}, term) when is_list(term) do
array(term, type, &cast/2, [])
end
def cast(:float, term) when is_binary(term) do
case Float.parse(term) do
{float, ""} -> {:ok, float}
_ -> :error
end
end
def cast(:float, term) when is_integer(term), do: {:ok, term + 0.0}
def cast(:boolean, term) when term in ~w(true 1), do: {:ok, true}
def cast(:boolean, term) when term in ~w(false 0), do: {:ok, false}
def cast(:decimal, term) when is_binary(term) do
Decimal.parse(term)
end
def cast(:decimal, term) when is_number(term) do
{:ok, Decimal.new(term)}
end
def cast(:date, term) do
cast_date(term)
end
def cast(:time, term) do
cast_time(term)
end
def cast(:naive_datetime, term) do
cast_naive_datetime(term)
end
def cast(:utc_datetime, term) do
cast_utc_datetime(term)
end
def cast(type, term) when type in [:id, :integer] and is_binary(term) do
case Integer.parse(term) do
{int, ""} -> {:ok, int}
_ -> :error
end
end
def cast(type, term) do
cond do
not primitive?(type) ->
type.cast(term)
of_base_type?(type, term) ->
{:ok, term}
true ->
:error
end
end
defp cast_embed(%{cardinality: :one}, nil), do: {:ok, nil}
defp cast_embed(%{cardinality: :one, related: schema}, %{__struct__: schema} = struct) do
{:ok, struct}
end
defp cast_embed(%{cardinality: :many}, nil), do: {:ok, []}
defp cast_embed(%{cardinality: :many, related: schema}, value) when is_list(value) do
if Enum.all?(value, &Kernel.match?(%{__struct__: ^schema}, &1)) do
{:ok, value}
else
:error
end
end
defp cast_embed(_embed, _value) do
:error
end
## Adapter related
@doc false
def adapter_load(_adapter, type, nil) do
load(type, nil)
end
def adapter_load(adapter, type, value) do
if of_base_type?(type, value) do
{:ok, value}
else
process_loaders(adapter.loaders(type(type), type), {:ok, value}, adapter)
end
end
defp process_loaders(_, :error, _adapter),
do: :error
defp process_loaders([fun|t], {:ok, value}, adapter) when is_function(fun),
do: process_loaders(t, fun.(value), adapter)
defp process_loaders([type|t], {:ok, value}, adapter),
do: process_loaders(t, load(type, value, &adapter_load(adapter, &1, &2)), adapter)
defp process_loaders([], {:ok, _} = acc, _adapter),
do: acc
@doc false
def adapter_dump(_adapter, type, nil),
do: dump(type, nil)
def adapter_dump(adapter, type, value),
do: process_dumpers(adapter.dumpers(type(type), type), {:ok, value}, adapter)
defp process_dumpers(_, :error, _adapter),
do: :error
defp process_dumpers([fun|t], {:ok, value}, adapter) when is_function(fun),
do: process_dumpers(t, fun.(value), adapter)
defp process_dumpers([type|t], {:ok, value}, adapter),
do: process_dumpers(t, dump(type, value, &adapter_dump(adapter, &1, &2)), adapter)
defp process_dumpers([], {:ok, _} = acc, _adapter),
do: acc
## Date
defp cast_date(binary) when is_binary(binary) do
case Date.from_iso8601(binary) do
{:ok, _} = ok ->
ok
{:error, _} ->
case NaiveDateTime.from_iso8601(binary) do
{:ok, naive_datetime} -> {:ok, NaiveDateTime.to_date(naive_datetime)}
{:error, _} -> :error
end
end
end
defp cast_date(%{"year" => empty, "month" => empty, "day" => empty}) when empty in ["", nil],
do: {:ok, nil}
defp cast_date(%{year: empty, month: empty, day: empty}) when empty in ["", nil],
do: {:ok, nil}
defp cast_date(%{"year" => year, "month" => month, "day" => day}),
do: cast_date(to_i(year), to_i(month), to_i(day))
defp cast_date(%{year: year, month: month, day: day}),
do: cast_date(to_i(year), to_i(month), to_i(day))
defp cast_date(_),
do: :error
defp cast_date(year, month, day) when is_integer(year) and is_integer(month) and is_integer(day) do
case Date.new(year, month, day) do
{:ok, _} = ok -> ok
{:error, _} -> :error
end
end
defp cast_date(_, _, _),
do: :error
defp dump_date(%Date{year: year, month: month, day: day}),
do: {:ok, {year, month, day}}
defp dump_date(%{__struct__: _} = struct),
do: Ecto.DataType.dump(struct)
defp dump_date(_),
do: :error
defp load_date(%Date{} = date),
do: {:ok, date}
defp load_date({year, month, day}),
do: {:ok, %Date{year: year, month: month, day: day}}
defp load_date(_),
do: :error
## Time
defp cast_time(<<hour::2-bytes, ?:, minute::2-bytes>>),
do: cast_time(to_i(hour), to_i(minute), 0, nil)
defp cast_time(binary) when is_binary(binary) do
case Time.from_iso8601(binary) do
{:ok, _} = ok -> ok
{:error, _} -> :error
end
end
defp cast_time(%{"hour" => empty, "minute" => empty}) when empty in ["", nil],
do: {:ok, nil}
defp cast_time(%{hour: empty, minute: empty}) when empty in ["", nil],
do: {:ok, nil}
defp cast_time(%{"hour" => hour, "minute" => minute} = map),
do: cast_time(to_i(hour), to_i(minute), to_i(Map.get(map, "second")), to_i(Map.get(map, "microsecond")))
defp cast_time(%{hour: hour, minute: minute, second: second, microsecond: {microsecond, precision}}),
do: cast_time(to_i(hour), to_i(minute), to_i(second), {to_i(microsecond), to_i(precision)})
defp cast_time(%{hour: hour, minute: minute} = map),
do: cast_time(to_i(hour), to_i(minute), to_i(Map.get(map, :second)), to_i(Map.get(map, :microsecond)))
defp cast_time(_),
do: :error
defp cast_time(hour, minute, sec, usec) when is_integer(usec) do
cast_time(hour, minute, sec, {usec, 6})
end
defp cast_time(hour, minute, sec, nil) do
cast_time(hour, minute, sec, {0, 0})
end
defp cast_time(hour, minute, sec, {usec, precision})
when is_integer(hour) and is_integer(minute) and
(is_integer(sec) or is_nil(sec)) and is_integer(usec) and is_integer(precision) do
case Time.new(hour, minute, sec || 0, {usec, precision}) do
{:ok, _} = ok -> ok
{:error, _} -> :error
end
end
defp cast_time(_, _, _, _) do
:error
end
defp dump_time(%Time{hour: hour, minute: minute, second: second, microsecond: {microsecond, _}}),
do: {:ok, {hour, minute, second, microsecond}}
defp dump_time(%{__struct__: _} = struct),
do: Ecto.DataType.dump(struct)
defp dump_time(_),
do: :error
defp load_time(%Time{} = time),
do: {:ok, time}
defp load_time({hour, minute, second, microsecond}),
do: {:ok, %Time{hour: hour, minute: minute, second: second, microsecond: {microsecond, 6}}}
defp load_time({hour, minute, second}),
do: {:ok, %Time{hour: hour, minute: minute, second: second}}
defp load_time(_),
do: :error
## Naive datetime
defp cast_naive_datetime(binary) when is_binary(binary) do
case NaiveDateTime.from_iso8601(binary) do
{:ok, _} = ok -> ok
{:error, _} -> :error
end
end
defp cast_naive_datetime(%{"year" => empty, "month" => empty, "day" => empty,
"hour" => empty, "minute" => empty}) when empty in ["", nil],
do: {:ok, nil}
defp cast_naive_datetime(%{year: empty, month: empty, day: empty,
hour: empty, minute: empty}) when empty in ["", nil],
do: {:ok, nil}
defp cast_naive_datetime(%{} = map) do
with {:ok, date} <- cast_date(map),
{:ok, time} <- cast_time(map) do
case NaiveDateTime.new(date, time) do
{:ok, _} = ok -> ok
{:error, _} -> :error
end
end
end
defp cast_naive_datetime(_) do
:error
end
defp dump_naive_datetime(%NaiveDateTime{year: year, month: month, day: day,
hour: hour, minute: minute, second: second, microsecond: {microsecond, _}}),
do: {:ok, {{year, month, day}, {hour, minute, second, microsecond}}}
defp dump_naive_datetime(%{__struct__: _} = struct),
do: Ecto.DataType.dump(struct)
defp dump_naive_datetime(_),
do: :error
defp load_naive_datetime(%NaiveDateTime{} = naive),
do: {:ok, naive}
defp load_naive_datetime({{year, month, day}, {hour, minute, second, microsecond}}),
do: {:ok, %NaiveDateTime{year: year, month: month, day: day,
hour: hour, minute: minute, second: second, microsecond: {microsecond, 6}}}
defp load_naive_datetime({{year, month, day}, {hour, minute, second}}),
do: {:ok, %NaiveDateTime{year: year, month: month, day: day,
hour: hour, minute: minute, second: second}}
defp load_naive_datetime(_),
do: :error
## UTC datetime
defp cast_utc_datetime(binary) when is_binary(binary) do
case DateTime.from_iso8601(binary) do
{:ok, datetime, _offset} -> {:ok, datetime}
{:error, :missing_offset} ->
case NaiveDateTime.from_iso8601(binary) do
{:ok, naive_datetime} -> {:ok, DateTime.from_naive!(naive_datetime, "Etc/UTC")}
{:error, _} -> :error
end
{:error, _} -> :error
end
end
defp cast_utc_datetime(%DateTime{time_zone: "Etc/UTC"} = datetime), do: {:ok, datetime}
defp cast_utc_datetime(%DateTime{} = datetime) do
case (datetime |> DateTime.to_unix() |> DateTime.from_unix()) do
{:ok, _} = ok -> ok
{:error, _} -> :error
end
end
defp cast_utc_datetime(value) do
case cast_naive_datetime(value) do
{:ok, %NaiveDateTime{} = naive_datetime} ->
{:ok, DateTime.from_naive!(naive_datetime, "Etc/UTC")}
{:ok, _} = ok ->
ok
:error ->
:error
end
end
defp dump_utc_datetime(%DateTime{year: year, month: month, day: day, time_zone: "Etc/UTC",
hour: hour, minute: minute, second: second, microsecond: {microsecond, _}}),
do: {:ok, {{year, month, day}, {hour, minute, second, microsecond}}}
defp dump_utc_datetime(%{__struct__: _} = struct),
do: Ecto.DataType.dump(struct)
defp dump_utc_datetime(_),
do: :error
defp load_utc_datetime(%DateTime{} = dt),
do: {:ok, dt}
defp load_utc_datetime({{year, month, day}, {hour, minute, second, microsecond}}),
do: {:ok, %DateTime{year: year, month: month, day: day,
hour: hour, minute: minute, second: second, microsecond: {microsecond, 6},
std_offset: 0, utc_offset: 0, zone_abbr: "UTC", time_zone: "Etc/UTC"}}
defp load_utc_datetime({{year, month, day}, {hour, minute, second}}),
do: {:ok, %DateTime{year: year, month: month, day: day,
hour: hour, minute: minute, second: second,
std_offset: 0, utc_offset: 0, zone_abbr: "UTC", time_zone: "Etc/UTC"}}
defp load_utc_datetime(_),
do: :error
## Helpers
# Checks if a value is of the given primitive type.
defp of_base_type?(:any, _), do: true
defp of_base_type?(:id, term), do: is_integer(term)
defp of_base_type?(:float, term), do: is_float(term)
defp of_base_type?(:integer, term), do: is_integer(term)
defp of_base_type?(:boolean, term), do: is_boolean(term)
defp of_base_type?(:binary, term), do: is_binary(term)
defp of_base_type?(:string, term), do: is_binary(term)
defp of_base_type?(:map, term), do: is_map(term) and not Map.has_key?(term, :__struct__)
defp of_base_type?(:decimal, value), do: Kernel.match?(%{__struct__: Decimal}, value)
defp of_base_type?(_, _), do: false
defp array([h|t], type, fun, acc) do
case fun.(type, h) do
{:ok, h} -> array(t, type, fun, [h|acc])
:error -> :error
end
end
defp array([], _type, _fun, acc) do
{:ok, Enum.reverse(acc)}
end
defp map([{key, value} | t], type, fun, acc) do
case fun.(type, value) do
{:ok, value} -> map(t, type, fun, Map.put(acc, key, value))
:error -> :error
end
end
defp map([], _type, _fun, acc) do
{:ok, acc}
end
defp map(_, _, _, _), do: :error
defp to_i(nil), do: nil
defp to_i(int) when is_integer(int), do: int
defp to_i(bin) when is_binary(bin) do
case Integer.parse(bin) do
{int, ""} -> int
_ -> nil
end
end
end