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filter.ex
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filter.ex
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defmodule Flop.Filter do
@moduledoc """
Defines a filter.
"""
use Ecto.Schema
import Ecto.Changeset
import Flop.Schema
alias Ecto.Changeset
alias Flop.CustomTypes.Any
alias Flop.CustomTypes.ExistingAtom
alias Flop.CustomTypes.Like
alias Flop.FieldInfo
@typedoc """
Represents filter query parameters.
### Fields
- `field`: The field the filter is applied to. The allowed fields can be
restricted by deriving `Flop.Schema` in your Ecto schema.
- `op`: The filter operator.
- `value`: The comparison value of the filter.
"""
@type t :: %__MODULE__{
field: atom | String.t(),
op: op,
value: any
}
@typedoc """
Represents valid filter operators.
| Operator | Value | WHERE clause |
| :-------------- | :------------------ | ------------------------------------------------------- |
| `:==` | `"Salicaceae"` | `WHERE column = 'Salicaceae'` |
| `:!=` | `"Salicaceae"` | `WHERE column != 'Salicaceae'` |
| `:=~` | `"cyth"` | `WHERE column ILIKE '%cyth%'` |
| `:empty` | `true` | `WHERE (column IS NULL) = true` |
| `:empty` | `false` | `WHERE (column IS NULL) = false` |
| `:not_empty` | `true` | `WHERE (column IS NOT NULL) = true` |
| `:not_empty` | `false` | `WHERE (column IS NOT NULL) = false` |
| `:<=` | `10` | `WHERE column <= 10` |
| `:<` | `10` | `WHERE column < 10` |
| `:>=` | `10` | `WHERE column >= 10` |
| `:>` | `10` | `WHERE column > 10` |
| `:in` | `["pear", "plum"]` | `WHERE column = ANY('pear', 'plum')` |
| `:not_in` | `["pear", "plum"]` | `WHERE column = NOT IN('pear', 'plum')` |
| `:contains` | `"pear"` | `WHERE 'pear' = ANY(column)` |
| `:not_contains` | `"pear"` | `WHERE 'pear' = NOT IN(column)` |
| `:like` | `"cyth"` | `WHERE column LIKE '%cyth%'` |
| `:not_like` | `"cyth"` | `WHERE column NOT LIKE '%cyth%'` |
| `:like_and` | `["Rubi", "Rosa"]` | `WHERE column LIKE '%Rubi%' AND column LIKE '%Rosa%'` |
| `:like_and` | `"Rubi Rosa"` | `WHERE column LIKE '%Rubi%' AND column LIKE '%Rosa%'` |
| `:like_or` | `["Rubi", "Rosa"]` | `WHERE column LIKE '%Rubi%' OR column LIKE '%Rosa%'` |
| `:like_or` | `"Rubi Rosa"` | `WHERE column LIKE '%Rubi%' OR column LIKE '%Rosa%'` |
| `:ilike` | `"cyth"` | `WHERE column ILIKE '%cyth%'` |
| `:not_ilike` | `"cyth"` | `WHERE column NOT ILIKE '%cyth%'` |
| `:ilike_and` | `["Rubi", "Rosa"]` | `WHERE column ILIKE '%Rubi%' AND column ILIKE '%Rosa%'` |
| `:ilike_and` | `"Rubi Rosa"` | `WHERE column ILIKE '%Rubi%' AND column ILIKE '%Rosa%'` |
| `:ilike_or` | `["Rubi", "Rosa"]` | `WHERE column ILIKE '%Rubi%' OR column ILIKE '%Rosa%'` |
| `:ilike_or` | `"Rubi Rosa"` | `WHERE column ILIKE '%Rubi%' OR column ILIKE '%Rosa%'` |
The filter operators `:empty` and `:not_empty` will regard empty arrays as
empty values if the field is known to be an array field.
The filter operators `:ilike_and`, `:ilike_or`, `:like_and` and `:like_or`
accept both strings and list of strings.
- If the filter value is a string, it will be split at whitespace characters
and the segments are combined with `and` or `or`.
- If a list of strings is passed, the individual strings are not split, and
the list items are combined with `and` or `or`.
"""
@type op ::
:==
| :!=
| :=~
| :empty
| :not_empty
| :<=
| :<
| :>=
| :>
| :in
| :not_in
| :contains
| :not_contains
| :like
| :not_like
| :like_and
| :like_or
| :ilike
| :not_ilike
| :ilike_and
| :ilike_or
@operators [
:==,
:!=,
:=~,
:empty,
:not_empty,
:<=,
:<,
:>=,
:>,
:in,
:not_in,
:contains,
:not_contains,
:like,
:not_like,
:like_and,
:like_or,
:ilike,
:not_ilike,
:ilike_and,
:ilike_or
]
@primary_key false
embedded_schema do
field :field, ExistingAtom
field :op, Ecto.Enum,
default: :==,
values: @operators
field :value, Any
end
@doc false
@spec changeset(__MODULE__.t(), map, keyword) :: Changeset.t()
def changeset(filter, %{} = params, opts \\ []) do
module = Keyword.get(opts, :for)
changeset =
filter
|> cast(params, [:field, :op])
|> validate_required([:field, :op])
|> validate_filterable(module)
if changeset.valid? do
field = Changeset.fetch_field!(changeset, :field)
op = Changeset.fetch_field!(changeset, :op)
field_info = module && get_field_info(module, field)
changeset
|> validate_op(field_info, op)
|> cast_value(field_info, op)
else
changeset
end
end
defp cast_value(%Changeset{params: params} = changeset, field_info, op) do
type = field_info |> value_type(op) |> expand_type()
value = filter_empty_values(type, params["value"])
case Ecto.Type.cast(type, value) do
{:ok, cast_value} -> put_change(changeset, :value, cast_value)
_ -> add_error(changeset, :value, "is invalid")
end
end
defp filter_empty_values({:array, type}, value) when is_list(value) do
for v <- value,
v when not is_nil(v) <- [filter_empty_values(type, v)],
do: v
end
defp filter_empty_values(_type, v) do
if is_binary(v) and String.trim_leading(v) == "", do: nil, else: v
end
defp value_type(_, :empty), do: :boolean
defp value_type(_, :not_empty), do: :boolean
defp value_type(_, :ilike_and), do: Like
defp value_type(_, :ilike_or), do: Like
defp value_type(_, :like_and), do: Like
defp value_type(_, :like_or), do: Like
defp value_type(nil, _), do: Any
defp value_type(%FieldInfo{ecto_type: type}, op), do: value_type(type, op)
defp value_type(type, :in), do: {:array, type}
defp value_type(type, :not_in), do: {:array, type}
defp value_type({:array, type}, :contains), do: type
defp value_type({:array, type}, :not_contains), do: type
defp value_type(type, _), do: type
defp expand_type({:from_schema, module, field}) do
module.__schema__(:type, field)
end
defp expand_type({:ecto_enum, values}) do
{:parameterized, Ecto.Enum, Ecto.Enum.init(values: values)}
end
defp expand_type(type), do: type
@spec validate_filterable(Changeset.t(), module | nil) :: Changeset.t()
defp validate_filterable(changeset, nil), do: changeset
defp validate_filterable(changeset, module) when is_atom(module) do
filterable_fields =
module
|> struct()
|> filterable()
validate_inclusion(changeset, :field, filterable_fields)
end
defp validate_op(changeset, nil, _), do: changeset
defp validate_op(%Changeset{valid?: true} = changeset, field_info, op) do
allowed_operators = allowed_operators(field_info)
if op in allowed_operators do
changeset
else
add_error(changeset, :op, "is invalid",
allowed_operators: allowed_operators
)
end
end
@doc """
Returns the allowed operators for the given schema module and field.
For regular Ecto schema fields, the type is derived via schema reflection.
If the given schema module derives `Flop.Schema`, the type of join and
custom fields is determined via the `ecto_type` option. Compound files are
always handled as string fields, minus unsupported operators.
If the type cannot be determined or if the type is not a native Ecto type, a
list with all operators is returned.
iex> allowed_operators(Pet, :age)
[:==, :!=, :empty, :not_empty, :<=, :<, :>=, :>, :in, :not_in]
"""
@spec allowed_operators(atom, atom) :: [op]
def allowed_operators(module, field)
when is_atom(module) and is_atom(field) do
module
|> get_field_info(field)
|> allowed_operators()
end
defp get_field_info(module, field) do
struct = struct(module)
if Flop.Schema.impl_for(struct) != Flop.Schema.Any do
Flop.Schema.field_info(struct, field)
else
module.__schema__(:type, field)
end
end
@doc """
Returns the allowed operators for the given Ecto type.
If the given value is not a native Ecto type, a list with all operators is
returned.
iex> allowed_operators(:integer)
[:==, :!=, :empty, :not_empty, :<=, :<, :>=, :>, :in, :not_in]
"""
@spec allowed_operators(FieldInfo.t() | Flop.Schema.ecto_type() | nil) :: [op]
def allowed_operators(%FieldInfo{operators: operators})
when is_list(operators) do
operators
end
def allowed_operators(%FieldInfo{ecto_type: ecto_type}) do
ecto_type |> expand_type() |> allowed_operators()
end
def allowed_operators(type) when type in [:decimal, :float, :id, :integer] do
[:==, :!=, :empty, :not_empty, :<=, :<, :>=, :>, :in, :not_in]
end
def allowed_operators(type) when type in [:binary_id, :string] do
[
:==,
:!=,
:=~,
:empty,
:not_empty,
:<=,
:<,
:>=,
:>,
:in,
:not_in,
:like,
:not_like,
:like_and,
:like_or,
:ilike,
:not_ilike,
:ilike_and,
:ilike_or
]
end
def allowed_operators(:boolean) do
[:==, :!=, :=~, :empty, :not_empty]
end
def allowed_operators({:array, _}) do
[
:==,
:!=,
:empty,
:not_empty,
:<=,
:<,
:>=,
:>,
:in,
:not_in,
:contains,
:not_contains
]
end
def allowed_operators({:map, _}) do
[:==, :!=, :empty, :not_empty, :in, :not_in]
end
def allowed_operators(:map) do
[:==, :!=, :empty, :not_empty, :in, :not_in]
end
def allowed_operators(type)
when type in [
:date,
:time,
:time_usec,
:naive_datetime,
:naive_datetime_usec,
:utc_datetime,
:utc_datetime_usec
] do
[:==, :!=, :empty, :not_empty, :<=, :<, :>=, :>, :in, :not_in]
end
def allowed_operators({:parameterized, Ecto.Enum, _}) do
[
:==,
:!=,
:empty,
:not_empty,
:<=,
:<,
:>=,
:>,
:in,
:not_in
]
end
def allowed_operators(_) do
[
:==,
:!=,
:=~,
:empty,
:not_empty,
:<=,
:<,
:>=,
:>,
:in,
:not_in,
:contains,
:not_contains,
:like,
:not_like,
:like_and,
:like_or,
:ilike,
:not_ilike,
:ilike_and,
:ilike_or
]
end
@doc """
Fetches the first filter for the given field and returns it in a tuple.
## Examples
### Flop.Filter struct
iex> fetch([], :name)
:error
iex> fetch([%Flop.Filter{field: :name, op: :==, value: "Joe"}], :name)
{:ok, %Flop.Filter{field: :name, op: :==, value: "Joe"}}
iex> fetch([%Flop.Filter{field: :name, op: :==, value: "Joe"}], :age)
:error
iex> fetch(
...> [
...> %Flop.Filter{field: :name, op: :==, value: "Joe"},
...> %Flop.Filter{field: :name, op: :==, value: "Jim"}
...> ],
...> :name
...> )
{:ok, %Flop.Filter{field: :name, op: :==, value: "Joe"}}
### Map with atom keys
iex> fetch([%{field: :name, op: :==, value: "Joe"}], :name)
{:ok, %{field: :name, op: :==, value: "Joe"}}
### Map with string keys
iex> fetch([%{"field" => "name", "op" => "==", "value" => "Joe"}], :name)
{:ok, %{"field" => "name", "op" => "==", "value" => "Joe"}}
### Indexed map
iex> fetch(
...> %{0 => %{field: "name", op: "==", value: "Joe"}},
...> :name
...> )
{:ok, %{field: "name", op: "==", value: "Joe"}}
iex> fetch(
...> %{"0" => %{"field" => "name", "op" => "==", "value" => "Joe"}},
...> :name
...> )
{:ok, %{"field" => "name", "op" => "==", "value" => "Joe"}}
"""
@doc since: "0.19.0"
@spec fetch([t()] | [map] | map, atom) :: {:ok, t() | map} | :error
def fetch(filters, field) when is_atom(field) do
filters
|> get(field)
|> case do
%{} = filter -> {:ok, filter}
nil -> :error
end
end
@doc """
Fetches the first filter value for the given field and returns it in a tuple.
## Examples
### Flop.Filter struct
iex> fetch_value([], :name)
:error
iex> fetch_value([%Flop.Filter{field: :name, op: :==, value: "Joe"}], :name)
{:ok, "Joe"}
iex> fetch_value([%Flop.Filter{field: :name, op: :==, value: "Joe"}], :age)
:error
iex> fetch_value(
...> [
...> %Flop.Filter{field: :name, op: :==, value: "Joe"},
...> %Flop.Filter{field: :name, op: :==, value: "Jim"}
...> ],
...> :name
...> )
{:ok, "Joe"}
### Map with atom keys
iex> fetch_value([%{field: :name, op: :==, value: "Joe"}], :name)
{:ok, "Joe"}
### Map with string keys
iex> fetch_value(
...> [%{"field" => "name", "op" => "==", "value" => "Joe"}],
...> :name
...> )
{:ok, "Joe"}
### Indexed map
iex> fetch_value(
...> %{0 => %{field: "name", op: "==", value: "Joe"}},
...> :name
...> )
{:ok, "Joe"}
iex> fetch_value(
...> %{"0" => %{"field" => "name", "op" => "==", "value" => "Joe"}},
...> :name
...> )
{:ok, "Joe"}
"""
@doc since: "0.20.0"
@spec fetch_value([t()] | [map] | map, atom) :: {:ok, any} | :error
def fetch_value(filters, field) when is_atom(field) do
filters
|> get_value(field)
|> case do
nil -> :error
value -> {:ok, value}
end
end
@doc """
Returns the first filter for the given field.
## Examples
### Flop.Filter struct
iex> get([], :name)
nil
iex> get([%Flop.Filter{field: :name, op: :==, value: "Joe"}], :name)
%Flop.Filter{field: :name, op: :==, value: "Joe"}
iex> get([%Flop.Filter{field: :name, op: :==, value: "Joe"}], :age)
nil
iex> get(
...> [
...> %Flop.Filter{field: :name, op: :==, value: "Joe"},
...> %Flop.Filter{field: :name, op: :==, value: "Jim"}
...> ],
...> :name
...> )
%Flop.Filter{field: :name, op: :==, value: "Joe"}
### Map with atom keys
iex> get([%{field: :name, op: :==, value: "Joe"}], :name)
%{field: :name, op: :==, value: "Joe"}
### Map with string keys
iex> get([%{"field" => "name", "op" => "==", "value" => "Joe"}], :name)
%{"field" => "name", "op" => "==", "value" => "Joe"}
iex> get([%{"field" => :name, "op" => "==", "value" => "Joe"}], :name)
%{"field" => :name, "op" => "==", "value" => "Joe"}
### Indexed map
iex> get(
...> %{0 => %{field: "name", op: "==", value: "Joe"}},
...> :name
...> )
%{field: "name", op: "==", value: "Joe"}
iex> get(
...> %{0 => %{field: :name, op: "==", value: "Joe"}},
...> :name
...> )
%{field: :name, op: "==", value: "Joe"}
iex> get(
...> %{"0" => %{"field" => "name", "op" => "==", "value" => "Joe"}},
...> :name
...> )
%{"field" => "name", "op" => "==", "value" => "Joe"}
iex> get(
...> %{"0" => %{"field" => :name, "op" => "==", "value" => "Joe"}},
...> :name
...> )
%{"field" => :name, "op" => "==", "value" => "Joe"}
"""
@doc since: "0.19.0"
@spec get([t()] | [map] | map, atom) :: t() | map | nil
def get(filters, field) when is_atom(field) do
field_str = to_string(field)
filters
|> Enum.find(&matches_field?(&1, field, field_str))
|> case do
{_, filter} -> filter
filter -> filter
end
end
@doc """
Returns the first filter value for the given field.
## Examples
### Flop.Filter struct
iex> get_value([], :name)
nil
iex> get_value([%Flop.Filter{field: :name, op: :==, value: "Joe"}], :name)
"Joe"
iex> get_value([%Flop.Filter{field: :name, op: :==, value: "Joe"}], :age)
nil
iex> get_value(
...> [
...> %Flop.Filter{field: :name, op: :==, value: "Joe"},
...> %Flop.Filter{field: :name, op: :==, value: "Jim"}
...> ],
...> :name
...> )
"Joe"
iex> get_value([%Flop.Filter{field: :ok, op: :empty, value: false}], :ok)
false
### Map with atom keys
iex> get_value([%{field: :name, op: :==, value: "Joe"}], :name)
"Joe"
### Map with string keys
iex> get_value(
...> [%{"field" => "name", "op" => "==", "value" => "Joe"}],
...> :name
...> )
"Joe"
### Indexed map
iex> get_value(
...> %{0 => %{field: "name", op: "==", value: "Joe"}},
...> :name
...> )
"Joe"
iex> get_value(
...> %{"0" => %{"field" => "name", "op" => "==", "value" => "Joe"}},
...> :name
...> )
"Joe"
"""
@doc since: "0.20.0"
@spec get_value([t()] | [map] | map, atom) :: any | nil
def get_value(filters, field) when is_atom(field) do
filters
|> get(field)
|> case do
nil -> nil
%{value: value} -> value
%{"value" => value} -> value
end
end
@doc """
Returns the all filters for the given field.
## Examples
### Flop.Filter struct
iex> get_all([], :name)
[]
iex> get_all([%Flop.Filter{field: :name, op: :==, value: "Joe"}], :name)
[%Flop.Filter{field: :name, op: :==, value: "Joe"}]
iex> get_all([%Flop.Filter{field: :name, op: :==, value: "Joe"}], :age)
[]
iex> get_all(
...> [
...> %Flop.Filter{field: :name, op: :==, value: "Joe"},
...> %Flop.Filter{field: :age, op: :>, value: 8},
...> %Flop.Filter{field: :name, op: :==, value: "Jim"}
...> ],
...> :name
...> )
[
%Flop.Filter{field: :name, op: :==, value: "Joe"},
%Flop.Filter{field: :name, op: :==, value: "Jim"}
]
### Map with atom keys
iex> get_all(
...> [
...> %{field: :name, op: :==, value: "Joe"},
...> %{field: :age, op: :>, value: 8},
...> %{field: :name, op: :==, value: "Jim"}
...> ],
...> :name
...> )
[
%{field: :name, op: :==, value: "Joe"},
%{field: :name, op: :==, value: "Jim"}
]
### Map with string keys
iex> get_all(
...> [
...> %{"field" => "name", "op" => "==", "value" => "Joe"},
...> %{"field" => "age", "op" => ">", "value" => 8},
...> %{"field" => "name", "op" => "==", "value" => "Jim"}
...> ],
...> :name
...> )
[
%{"field" => "name", "op" => "==", "value" => "Joe"},
%{"field" => "name", "op" => "==", "value" => "Jim"}
]
### Indexed map
iex> get_all(
...> %{
...> 0 => %{field: "name", op: "==", value: "Joe"},
...> 1 => %{field: "age", op: ">", value: 8},
...> 2 => %{field: "name", op: "==", value: "Jim"}
...> },
...> :name
...> )
[
%{field: "name", op: "==", value: "Joe"},
%{field: "name", op: "==", value: "Jim"}
]
iex> get_all(
...> %{
...> "0" => %{"field" => "name", "op" => "==", "value" => "Joe"},
...> "1" => %{"field" => "age", "op" => ">", "value" => 8},
...> "2" => %{"field" => "name", "op" => "==", "value" => "Jim"}
...> },
...> :name
...> )
[
%{"field" => "name", "op" => "==", "value" => "Joe"},
%{"field" => "name", "op" => "==", "value" => "Jim"}
]
"""
@doc since: "0.19.0"
@spec get_all([t()] | [map] | map, atom) :: [t()] | [map]
def get_all(filters, field) when is_atom(field) do
field_str = to_string(field)
filters
|> Enum.filter(&matches_field?(&1, field, field_str))
|> Enum.map(fn
{_, filter} -> filter
filter -> filter
end)
end
@doc """
Deletes the filters for the given field from a list of filters.
## Examples
### Flop.Filter struct
iex> delete(
...> [
...> %Flop.Filter{field: :name, op: :==, value: "Joe"},
...> %Flop.Filter{field: :age, op: :>, value: 8}
...> ],
...> :name
...> )
[%Flop.Filter{field: :age, op: :>, value: 8}]
iex> delete(
...> [
...> %Flop.Filter{field: :name, op: :==, value: "Joe"},
...> %Flop.Filter{field: :age, op: :>, value: 8},
...> %Flop.Filter{field: :name, op: :==, value: "Jim"}
...> ],
...> :name
...> )
[%Flop.Filter{field: :age, op: :>, value: 8}]
iex> delete([%Flop.Filter{field: :name, op: :==, value: "Joe"}], :age)
[%Flop.Filter{field: :name, op: :==, value: "Joe"}]
### Map with atom keys
iex> delete(
...> [
...> %{field: :name, op: :==, value: "Joe"},
...> %{field: :age, op: :>, value: 8}
...> ],
...> :name
...> )
[%{field: :age, op: :>, value: 8}]
### Map with string keys
iex> delete(
...> [
...> %{"field" => "name", "op" => "==", "value" => "Joe"},
...> %{"field" => "age", "op" => ">", "value" => "8"}
...> ],
...> :name
...> )
[%{"field" => "age", "op" => ">", "value" => "8"}]
### Indexed map
Filters passed as an indexed map will be converted to a list, even if no
matching filter exists.
iex> delete(
...> %{
...> 0 => %{field: "name", op: "==", value: "Joe"},
...> 1 => %{field: "age", op: ">", value: "8"}
...> },
...> :name
...> )
[%{field: "age", op: ">", value: "8"}]
iex> delete(
...> %{
...> "0" => %{"field" => "name", "op" => "==", "value" => "Joe"},
...> "1" => %{"field" => "age", "op" => ">", "value" => "8"}
...> },
...> :name
...> )
[%{"field" => "age", "op" => ">", "value" => "8"}]
"""
@doc since: "0.19.0"
@spec delete([t] | [map] | map, atom) :: [t] | [map]
def delete(filters, field) when is_atom(field) do
field_str = to_string(field)
filters
|> indexed_map_to_list()
|> Enum.reject(&matches_field?(&1, field, field_str))
end
@doc """
Deletes the first filter in list of filters for the given field.
## Examples
### Flop.Filter struct
iex> delete_first(
...> [
...> %Flop.Filter{field: :name, op: :==, value: "Joe"},
...> %Flop.Filter{field: :age, op: :>, value: 8},
...> %Flop.Filter{field: :name, op: :==, value: "Jim"}
...> ],
...> :name
...> )
[
%Flop.Filter{field: :age, op: :>, value: 8},
%Flop.Filter{field: :name, op: :==, value: "Jim"}
]
iex> delete_first([%Flop.Filter{field: :name, op: :==, value: "Joe"}], :age)
[%Flop.Filter{field: :name, op: :==, value: "Joe"}]
### Map with atom keys
iex> delete_first(
...> [
...> %{field: :name, op: :==, value: "Joe"},
...> %{field: :age, op: :>, value: 8},
...> %{field: :name, op: :==, value: "Jim"}
...> ],
...> :name
...> )
[
%{field: :age, op: :>, value: 8},
%{field: :name, op: :==, value: "Jim"}
]
### Map with string keys
iex> delete_first(
...> [
...> %{"field" => "name", "op" => "==", "value" => "Joe"},
...> %{"field" => "age", "op" => ">", "value" => 8},
...> %{"field" => "name", "op" => "==", "value" => "Jim"}
...> ],
...> :name
...> )
[
%{"field" => "age", "op" => ">", "value" => 8},
%{"field" => "name", "op" => "==", "value" => "Jim"}
]
iex> delete_first(
...> [
...> %{"field" => :name, "op" => :==, "value" => "Joe"},
...> %{"field" => :age, "op" => :>, "value" => 8},
...> %{"field" => :name, "op" => :==, "value" => "Jim"}
...> ],
...> :name
...> )
[
%{"field" => :age, "op" => :>, "value" => 8},
%{"field" => :name, "op" => :==, "value" => "Jim"}
]
### Indexed map
Filters passed as an indexed map will be converted to a list, even if no
matching filter exists.
iex> delete_first(
...> %{
...> 0 => %{field: "name", op: "==", value: "Joe"},
...> 1 => %{field: "age", op: ">", value: 8},
...> 2 => %{field: "name", op: "==", value: "Jim"}
...> },
...> :name
...> )
[
%{field: "age", op: ">", value: 8},
%{field: "name", op: "==", value: "Jim"}
]
iex> delete_first(
...> %{
...> "0" => %{"field" => "name", "op" => "==", "value" => "Joe"},
...> "1" => %{"field" => "age", "op" => ">", "value" => 8},
...> "2" => %{"field" => "name", "op" => "==", "value" => "Jim"}
...> },
...> :name
...> )
[
%{"field" => "age", "op" => ">", "value" => 8},
%{"field" => "name", "op" => "==", "value" => "Jim"}
]
"""
@doc since: "0.19.0"
@spec delete_first([t] | [map] | map, atom) :: [t] | [map]
def delete_first(filters, field) when is_list(filters) and is_atom(field) do
delete_first_filter(filters, field, to_string(field))
end
def delete_first(%{} = filters, field) when is_atom(field) do
filters |> indexed_map_to_list() |> delete_first(field)
end
defp delete_first_filter([%{field: field} | tail], field, _), do: tail
defp delete_first_filter([%{field: field} | tail], _, field), do: tail
defp delete_first_filter([%{"field" => field} | tail], field, _), do: tail
defp delete_first_filter([%{"field" => field} | tail], _, field), do: tail
defp delete_first_filter([%{} = filter | tail], field, field_str) do
[filter | delete_first_filter(tail, field, field_str)]
end
defp delete_first_filter([], _, _), do: []
@doc """
Removes the filters for the given fields from a list of filters.
## Examples
### Flop.Filter struct
iex> drop(
...> [
...> %Flop.Filter{field: :name, op: :==, value: "Joe"},
...> %Flop.Filter{field: :age, op: :>, value: 8},
...> %Flop.Filter{field: :color, op: :==, value: "blue"}
...> ],
...> [:name, :color]
...> )
[%Flop.Filter{field: :age, op: :>, value: 8}]
iex> drop(
...> [
...> %Flop.Filter{field: :name, op: :==, value: "Joe"},
...> %Flop.Filter{field: :age, op: :>, value: 8},
...> %Flop.Filter{field: :color, op: :==, value: "blue"},
...> %Flop.Filter{field: :name, op: :==, value: "Jim"}
...> ],
...> [:name, :species]
...> )
[
%Flop.Filter{field: :age, op: :>, value: 8},
%Flop.Filter{field: :color, op: :==, value: "blue"}
]
### Map with atom keys
iex> drop(
...> [
...> %{field: :name, op: :==, value: "Joe"},
...> %{field: :age, op: :>, value: 8},
...> %{field: :color, op: :==, value: "blue"}
...> ],
...> [:name, :color]