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defmodule Ash.Changeset do
@moduledoc """
Changesets are used to create and update data in Ash.
Create a changeset with `new/1` or `new/2`, and alter the attributes
and relationships using the functions provided in this module. Nothing in this module
actually incurs changes in a data layer. To commit a changeset, see `c:Ash.Api.create/2`
and `c:Ash.Api.update/2`.
For example:
```elixir
Ash.Changeset.replace_relationship(changeset, :linked_tickets, [
{1, %{link_type: "blocking"}},
{a_ticket, %{link_type: "caused_by"}},
{%{id: 2}, %{link_type: "related_to"}}
])
```
`Ash.Changeset.replace_relationship/3`, `Ash.Changeset.append_to_relationship/3` and `Ash.Changeset.remove_from_relationship/3`
are simply about managing what data is/isn't related. A simple example might be updating the *tags* of a post, where all the tags
already exist, we simply want to edit the information. They are shorthands for calling `Ash.Changeset.manage_relationship/4` with
a specific set of options.
See the action DSL documentation for more.
"""
defstruct [
:data,
:action_type,
:action,
:resource,
:api,
:tenant,
:__validated_for_action__,
:handle_errors,
select: nil,
params: %{},
action_failed?: false,
arguments: %{},
context: %{},
after_action: [],
before_action: [],
errors: [],
valid?: true,
attributes: %{},
relationships: %{},
change_dependencies: []
]
defimpl Inspect do
import Inspect.Algebra
def inspect(changeset, opts) do
context = Map.delete(changeset.context, :private)
context =
if context == %{} do
empty()
else
concat("context: ", to_doc(sanitize_context(context), opts))
end
tenant =
if changeset.tenant do
concat("tenant: ", to_doc(changeset.tenant, opts))
else
empty()
end
api =
if changeset.api do
concat("api: ", to_doc(changeset.api, opts))
else
empty()
end
container_doc(
"#Ash.Changeset<",
[
api,
concat("action_type: ", inspect(changeset.action_type)),
concat("action: ", inspect(changeset.action && changeset.action.name)),
tenant,
concat("attributes: ", to_doc(changeset.attributes, opts)),
concat("relationships: ", to_doc(changeset.relationships, opts)),
arguments(changeset, opts),
concat("errors: ", to_doc(changeset.errors, opts)),
concat("data: ", to_doc(changeset.data, opts)),
context,
concat("valid?: ", to_doc(changeset.valid?, opts))
],
">",
opts,
fn str, _ -> str end
)
end
defp sanitize_context(%{manage_relationship_source: manage_relationship_source} = context) do
sanitized_managed_relationship_source =
manage_relationship_source
|> Enum.reverse()
|> Enum.map(fn {resource, rel, _} ->
"#{inspect(resource)}.#{rel}"
end)
|> Enum.join(" -> ")
%{
context
| manage_relationship_source:
"#manage_relationship_source<#{sanitized_managed_relationship_source}>"
}
end
defp sanitize_context(context), do: context
defp arguments(changeset, opts) do
if changeset.action do
if Enum.empty?(changeset.action.arguments) do
empty()
else
arg_string =
changeset.action.arguments
|> Enum.filter(fn argument ->
match?({:ok, _}, Ash.Changeset.fetch_argument(changeset, argument.name))
end)
|> Map.new(fn argument ->
if argument.sensitive? do
{argument.name, "**redacted**"}
else
{argument.name, Ash.Changeset.get_argument(changeset, argument.name)}
end
end)
|> to_doc(opts)
concat(["arguments: ", arg_string])
end
else
empty()
end
end
end
@type t :: %__MODULE__{data: Ash.Resource.record()}
alias Ash.Error.{
Changes.InvalidArgument,
Changes.InvalidAttribute,
Changes.InvalidChanges,
Changes.InvalidRelationship,
Changes.NoSuchAttribute,
Changes.NoSuchRelationship,
Changes.Required,
Invalid.NoSuchResource
}
@doc """
Return a changeset over a resource or a record. `params` can be either attributes, relationship values or arguments.
If you are using external input, you almost certainly want to use `Ash.Changeset.for_<action_type>`. However, you can
use `Ash.Changeset.new/2` to start a changeset and make a few changes prior to calling `for_action`. For example:
```elixir
Ash.Changeset.new()
|> Ash.Changeset.change_attribute(:name, "foobar")
|> Ash.Changeset.for_action(...)
```
Anything that is modified prior to `for_action` is validated against the rules of the action, while *anything after it is not*.
This changeset does not consider an action, and so allows you to change things with minimal validation. Values are
validated when changed, and the existence of attributes and relationships are validated. If you want to essentially
"run an action", and get back a changeset with any errors that would be generated by that action (with the exception
of errors that can only be generated by the data layer), use `for_action/4`.
Additionally, this format only supports supplying attributes in the params. This is because we don't know what the
behavior should be for relationship changes, nor what arguments are available. You can manage them yourself with
the functions that allow managing arguments/relationships that are provided in this module, e.g `set_argument/3` and
`replace_relationship/3`
"""
@spec new(Ash.Resource.t() | Ash.Resource.record(), params :: map) :: t
def new(resource, params \\ %{})
def new(%resource{} = record, params) do
tenant =
record
|> Map.get(:__metadata__, %{})
|> Map.get(:tenant, nil)
context = Ash.Resource.Info.default_context(resource) || %{}
if Ash.Resource.Info.resource?(resource) do
%__MODULE__{resource: resource, data: record, action_type: :update}
|> change_attributes(params)
|> set_context(context)
|> set_tenant(tenant)
else
%__MODULE__{
resource: resource,
action_type: :update,
data: struct(resource)
}
|> add_error(NoSuchResource.exception(resource: resource))
|> set_tenant(tenant)
|> set_context(context)
end
end
def new(resource, params) do
if Ash.Resource.Info.resource?(resource) do
%__MODULE__{
resource: resource,
action_type: :create,
data: struct(resource)
}
|> change_attributes(params)
else
%__MODULE__{resource: resource, action_type: :create, data: struct(resource)}
|> add_error(NoSuchResource.exception(resource: resource))
end
end
@doc """
Ensure that only the specified attributes are present in the results.
The first call to `select/2` will replace the default behavior of selecting
all attributes. Subsequent calls to `select/2` will combine the provided
fields unless the `replace?` option is provided with a value of `true`.
If a field has been deselected, selecting it again will override that (because a single list of fields is tracked for selection)
Primary key attributes always selected and cannot be deselected.
When attempting to load a relationship (or manage it with `Ash.Changeset.manage_relationship/3`),
if the source field is not selected on the query/provided data an error will be produced. If loading
a relationship with a query, an error is produced if the query does not select the destination field
of the relationship.
Datalayers currently are not notified of the `select` for a changeset(unlike queries), and creates/updates select all fields when they are performed.
A select provided on a changeset simply sets the unselected fields to `nil` before returning the result.
Use `ensure_selected/2` if you simply wish to make sure a field has been selected, without deselecting any other fields.
"""
def select(changeset, fields, opts \\ []) do
if opts[:replace?] do
%{changeset | select: Enum.uniq(List.wrap(fields))}
else
%{changeset | select: Enum.uniq(List.wrap(fields) ++ (changeset.select || []))}
end
end
@doc """
Ensures that the given attributes are selected.
The first call to `select/2` will *limit* the fields to only the provided fields.
Use `ensure_selected/2` to say "select this field (or these fields) without deselecting anything else".
See `select/2` for more.
"""
def ensure_selected(changeset, fields) do
if changeset.select do
Ash.Changeset.select(changeset, List.wrap(fields))
else
to_select =
changeset.resource
|> Ash.Resource.Info.attributes()
|> Enum.map(& &1.name)
Ash.Changeset.select(changeset, to_select)
end
end
@doc """
Ensure the the specified attributes are `nil` in the changeset results.
"""
def deselect(changeset, fields) do
select =
if changeset.select do
changeset.select
else
changeset.resource
|> Ash.Resource.Info.attributes()
|> Enum.map(& &1.name)
end
select = select -- List.wrap(fields)
select(changeset, select, replace?: true)
end
def selecting?(changeset, field) do
case changeset.select do
nil ->
not is_nil(Ash.Resource.Info.attribute(changeset.resource, field))
select ->
if field in select do
true
else
attribute = Ash.Resource.Info.attribute(changeset.resource, field)
attribute && (attribute.private? || attribute.primary_key?)
end
end
end
@manage_types [:replace, :append, :remove, :direct_control, :create]
@for_create_opts [
relationships: [
type: :any,
doc: """
customize relationship behavior.
By default, any relationships are ignored. There are three ways to change relationships with this function:
### Action Arguments (preferred)
Create an argument on the action and add a `Ash.Resource.Change.Builtins.manage_relationship/3` change to the action.
### Overrides
You can pass the `relationships` option to specify the behavior. It is a keyword list of relationship and either
* one of the preset manage types: #{inspect(@manage_types)}
* explicit options, in the form of `{:manage, [...opts]}`
```elixir
Ash.Changeset.for_create(MyResource, :create, params, relationships: [relationship: :append, other_relationship: {:manage, [...opts]}])
```
You can also use explicit calls to `manage_relationship/4`.
"""
],
require?: [
type: :boolean,
default: false,
doc:
"If set to `true`, values are only required when the action is run (instead of immediately)."
],
actor: [
type: :any,
doc:
"set the actor, which can be used in any `Ash.Resource.Change`s configured on the action. (in the `context` argument)"
],
tenant: [
type: :any,
doc: "set the tenant on the changeset"
]
]
@doc false
def for_create_opts, do: @for_create_opts
@doc """
Constructs a changeset for a given create action, and validates it.
Anything that is modified prior to `for_create/4` is validated against the rules of the action, while *anything after it is not*.
This runs any `change`s contained on your action. To have your logic execute *only* during the action, you can use `after_action/2`
or `before_action/2`.
Multitenancy is *not* validated until an action is called. This allows you to avoid specifying a tenant until just before calling
the api action.
### Params
`params` may be attributes, relationships, or arguments. You can safely pass user/form input directly into this function.
Only public attributes and relationships are supported. If you want to change private attributes as well, see the
Customization section below. `params` are stored directly as given in the `params` field of the changeset, which is used
### Opts
#{Ash.OptionsHelpers.docs(@for_create_opts)}
### Customization
A changeset can be provided as the first argument, instead of a resource, to allow
setting specific attributes ahead of time.
For example:
MyResource
|> Ash.Changeset.new()
|> Ash.Changeset.change_attribute(:foo, 1)
|> Ash.Changeset.for_create(:create, ...opts)
Once a changeset has been validated by `for_create/4` (or `for_update/4`), it isn't validated again in the action.
New changes added are validated individually, though. This allows you to create a changeset according
to a given action, and then add custom changes if necessary.
"""
def for_create(initial, action, params \\ %{}, opts \\ []) do
changeset =
case initial do
%__MODULE__{action_type: :create} = changeset ->
changeset
resource when is_atom(resource) ->
new(resource)
other ->
raise ArgumentError,
message: """
Initial must be a changeset with the action type of `:create`, or a resource.
Got: #{inspect(other)}
"""
end
for_action(changeset, action, params, opts)
end
@doc """
Constructs a changeset for a given update action, and validates it.
Anything that is modified prior to `for_update/4` is validated against the rules of the action, while *anything after it is not*.
See `for_create/4` for more information
"""
def for_update(initial, action, params \\ %{}, opts \\ []) do
changeset =
case initial do
# We accept :destroy here to support soft deletes
%__MODULE__{action_type: type} = changeset when type in [:update, :destroy] ->
changeset
%mod{} = struct when mod != __MODULE__ ->
new(struct)
other ->
raise ArgumentError,
message: """
Initial must be a changeset with the action type of `:update` or `:destroy`, or a record.
Got: #{inspect(other)}
"""
end
for_action(changeset, action, params, opts)
end
@doc """
Constructs a changeset for a given destroy action, and validates it.
### Opts
* `:actor` - set the actor, which can be used in any `Ash.Resource.Change`s configured on the action. (in the `context` argument)
* `:tenant` - set the tenant on the changeset
Anything that is modified prior to `for_destroy/4` is validated against the rules of the action, while *anything after it is not*.
Once a changeset has been validated by `for_destroy/4`, it isn't validated again in the action.
New changes added are validated individually, though. This allows you to create a changeset according
to a given action, and then add custom changes if necessary.
"""
def for_destroy(initial, action_name, params \\ %{}, opts \\ []) do
changeset =
case initial do
%__MODULE__{} = changeset ->
changeset
|> Map.put(:action_type, :destroy)
%_{} = struct ->
struct
|> new()
|> Map.put(:action_type, :destroy)
other ->
raise ArgumentError,
message: """
Initial must be a changeset with the action type of `:destroy`, or a record.
Got: #{inspect(other)}
"""
end
if changeset.valid? do
action = Ash.Resource.Info.action(changeset.resource, action_name, changeset.action_type)
if action do
changeset
|> handle_errors(action.error_handler)
|> set_actor(opts)
|> set_tenant(opts[:tenant] || changeset.tenant)
|> Map.put(:__validated_for_action__, action.name)
|> Map.put(:action, action)
|> cast_params(action, params, opts)
|> set_argument_defaults(action)
|> run_action_changes(action, opts[:actor])
|> add_validations()
|> mark_validated(action.name)
|> require_arguments(action)
else
raise_no_action(changeset.resource, action_name, :destroy)
end
else
changeset
end
end
defp for_action(changeset, action_name, params, opts) do
if changeset.valid? do
action = Ash.Resource.Info.action(changeset.resource, action_name, changeset.action_type)
if action do
changeset =
changeset
|> handle_errors(action.error_handler)
|> set_actor(opts)
|> set_tenant(opts[:tenant] || changeset.tenant)
|> Map.put(:action, action)
|> Map.put(:__validated_for_action__, action.name)
|> cast_params(action, params || %{}, opts)
|> set_argument_defaults(action)
|> validate_attributes_accepted(action)
|> require_values(action.type, false, action.require_attributes)
|> run_action_changes(action, opts[:actor])
|> set_defaults(changeset.action_type, false)
|> add_validations()
|> mark_validated(action.name)
|> require_arguments(action)
if Keyword.get(opts, :require?, true) do
require_values(changeset, action.type)
else
changeset
end
else
raise_no_action(changeset.resource, action_name, changeset.action_type)
end
else
changeset
end
end
defp require_arguments(changeset, action) do
changeset
|> do_require_arguments(action)
end
defp do_require_arguments(changeset, action) do
action.arguments
|> Enum.filter(&(&1.allow_nil? == false))
|> Enum.reduce(changeset, fn argument, changeset ->
case fetch_argument(changeset, argument.name) do
{:ok, value} when not is_nil(value) ->
changeset
_ ->
add_error(
changeset,
Ash.Error.Changes.Required.exception(
resource: changeset.resource,
field: argument.name,
type: :argument
)
)
end
end)
end
defp set_argument_defaults(changeset, action) do
Enum.reduce(action.arguments, changeset, fn argument, changeset ->
case fetch_argument(changeset, argument.name) do
:error ->
if is_nil(argument.default) do
changeset
else
%{
changeset
| arguments: Map.put(changeset.arguments, argument.name, default(:create, argument))
}
end
_ ->
changeset
end
end)
end
defp set_actor(changeset, opts) do
if Keyword.has_key?(opts, :actor) do
put_context(changeset, :private, %{actor: opts[:actor]})
else
changeset
end
end
defp raise_no_action(resource, action, type) do
available_actions =
resource
|> Ash.Resource.Info.actions()
|> Enum.filter(&(&1.type == type))
|> Enum.map_join("\n", &" - `#{inspect(&1.name)}`")
raise ArgumentError,
message: """
No such #{type} action on resource #{inspect(resource)}: #{String.slice(inspect(action), 0..50)}
Example Call:
Ash.Changeset.for_#{type}(changeset_or_record, :action_name, input, options)
Available #{type} actions:
#{available_actions}
"""
end
defp mark_validated(changeset, action_name) do
%{changeset | __validated_for_action__: action_name}
end
@doc false
def validate_multitenancy(changeset) do
if Ash.Resource.Info.multitenancy_strategy(changeset.resource) &&
not Ash.Resource.Info.multitenancy_global?(changeset.resource) &&
is_nil(changeset.tenant) do
add_error(
changeset,
"#{inspect(changeset.resource)} changesets require a tenant to be specified"
)
else
changeset
end
end
defp cast_params(changeset, action, params, opts) do
changeset = %{
changeset
| params: Map.merge(changeset.params || %{}, Enum.into(params || %{}, %{}))
}
Enum.reduce(params, changeset, fn {name, value}, changeset ->
cond do
has_argument?(action, name) ->
set_argument(changeset, name, value)
attr = Ash.Resource.Info.public_attribute(changeset.resource, name) ->
if attr.writable? do
change_attribute(changeset, attr.name, value)
else
changeset
end
rel = Ash.Resource.Info.public_relationship(changeset.resource, name) ->
if rel.writable? do
behaviour = opts[:relationships][rel.name]
case behaviour do
nil ->
changeset
type when is_atom(type) ->
manage_relationship(changeset, rel.name, value, type: type)
{:manage, manage_opts} ->
manage_relationship(changeset, rel.name, value, manage_opts)
end
else
changeset
end
true ->
changeset
end
end)
end
defp has_argument?(action, name) when is_atom(name) do
Enum.any?(action.arguments, &(&1.private? == false && &1.name == name))
end
defp has_argument?(action, name) when is_binary(name) do
Enum.any?(action.arguments, &(&1.private? == false && to_string(&1.name) == name))
end
defp validate_attributes_accepted(changeset, %{accept: nil}), do: changeset
defp validate_attributes_accepted(changeset, %{accept: accepted_attributes}) do
changeset.attributes
|> Enum.reject(fn {key, _value} ->
key in accepted_attributes
end)
|> Enum.reduce(changeset, fn {key, _}, changeset ->
add_error(
changeset,
InvalidAttribute.exception(field: key, message: "cannot be changed")
)
end)
end
defp run_action_changes(changeset, %{changes: changes}, actor) do
Enum.reduce(changes, changeset, fn
%{change: {module, opts}}, changeset ->
module.change(changeset, opts, %{actor: actor})
%{validation: _} = validation, changeset ->
validate(changeset, validation)
end)
end
@doc false
def set_defaults(changeset, action_type, lazy? \\ false)
def set_defaults(changeset, :create, lazy?) do
changeset.resource
|> Ash.Resource.Info.attributes()
|> Enum.filter(&(not is_nil(&1.default)))
|> Enum.filter(fn attribute ->
lazy? or
not (is_function(attribute.default) or match?({_, _, _}, attribute.default))
end)
|> Enum.reduce(changeset, fn attribute, changeset ->
force_change_new_attribute_lazy(changeset, attribute.name, fn ->
default(:create, attribute)
end)
end)
end
def set_defaults(changeset, :update, lazy?) do
changeset.resource
|> Ash.Resource.Info.attributes()
|> Enum.filter(&(not is_nil(&1.update_default)))
|> Enum.filter(fn attribute ->
lazy? or
not (is_function(attribute.update_default) or match?({_, _, _}, attribute.update_default))
end)
|> Enum.reduce(changeset, fn attribute, changeset ->
force_change_new_attribute_lazy(changeset, attribute.name, fn ->
default(:update, attribute)
end)
end)
end
def set_defaults(changeset, _, _) do
changeset
end
defp default(:create, %{default: {mod, func, args}}), do: apply(mod, func, args)
defp default(:create, %{default: function}) when is_function(function, 0), do: function.()
defp default(:create, %{default: value}), do: value
defp default(:update, %{update_default: {mod, func, args}}), do: apply(mod, func, args)
defp default(:update, %{update_default: function}) when is_function(function, 0),
do: function.()
defp default(:update, %{update_default: value}), do: value
defp add_validations(changeset) do
changeset.resource
# We use the `changeset.action_type` to support soft deletes
# Because a delete is an `update` with an action type of `update`
|> Ash.Resource.Info.validations(changeset.action_type)
|> Enum.reduce(changeset, &validate(&2, &1))
end
defp validate(changeset, validation) do
if validation.before_action? do
before_action(changeset, fn changeset ->
if validation.expensive? and not changeset.valid? do
changeset
else
do_validation(changeset, validation)
end
end)
else
if validation.expensive? and not changeset.valid? do
changeset
else
do_validation(changeset, validation)
end
end
end
defp do_validation(changeset, validation) do
case validation.module.validate(changeset, validation.opts) do
:ok ->
changeset
{:error, error} when is_binary(error) ->
Ash.Changeset.add_error(changeset, validation.message || error)
{:error, error} when is_exception(error) ->
if validation.message do
error =
case error do
%{field: field} when not is_nil(field) ->
error
|> Map.take([:field, :vars])
|> Map.to_list()
|> Keyword.put(:message, validation.message)
|> InvalidAttribute.exception()
%{fields: fields} when fields not in [nil, []] ->
error
|> Map.take([:fields, :vars])
|> Map.to_list()
|> Keyword.put(:message, validation.message)
|> InvalidChanges.exception()
_ ->
validation.message
end
Ash.Changeset.add_error(changeset, error)
else
Ash.Changeset.add_error(changeset, error)
end
{:error, error} ->
error =
if Keyword.keyword?(error) do
Keyword.put(error, :message, validation.message || error[:message])
else
validation.message || error
end
Ash.Changeset.add_error(changeset, error)
end
end
@doc false
def require_values(changeset, action_type, private_and_belongs_to? \\ false, attrs \\ nil)
def require_values(changeset, :create, private_and_belongs_to?, attrs) do
attributes =
attrs ||
attributes_to_require(changeset.resource, changeset.action, private_and_belongs_to?)
Enum.reduce(attributes, changeset, fn required_attribute, changeset ->
if is_atom(required_attribute) do
if is_nil(get_attribute(changeset, required_attribute)) do
add_error(
changeset,
Required.exception(
resource: changeset.resource,
field: required_attribute,
type: :attribute
)
)
else
changeset
end
else
if changing_attribute?(changeset, required_attribute.name) ||
not is_nil(required_attribute.default) do
changeset
else
add_error(
changeset,
Required.exception(
resource: changeset.resource,
field: required_attribute.name,
type: :attribute
)
)
end
end
end)
end
def require_values(changeset, :update, private_and_belongs_to?, attrs) do
attributes =
attrs ||
attributes_to_require(changeset.resource, changeset.action, private_and_belongs_to?)
Enum.reduce(attributes, changeset, fn required_attribute, changeset ->
if is_atom(required_attribute) do
if is_nil(get_attribute(changeset, required_attribute)) do
add_error(
changeset,
Required.exception(
resource: changeset.resource,
field: required_attribute,
type: :attribute
)
)
else
changeset
end
else
if changing_attribute?(changeset, required_attribute.name) do
if is_nil(get_attribute(changeset, required_attribute.name)) do
add_error(
changeset,
Required.exception(
resource: changeset.resource,
field: required_attribute.name,
type: :attribute
)
)
else
changeset
end
else
changeset
end
end
end)
end
def require_values(changeset, _, _, _), do: changeset
# Attributes that are private and/or are the source field of a belongs_to relationship
# are typically not set by input, so they aren't required until the actual action
# is run.
defp attributes_to_require(resource, _action, true = _private_and_belongs_to?) do
resource
|> Ash.Resource.Info.attributes()
|> Enum.reject(&(&1.allow_nil? || &1.generated?))
end
defp attributes_to_require(resource, action, false = _private_and_belongs_to?) do
belongs_to =
resource
|> Ash.Resource.Info.relationships()
|> Enum.filter(&(&1.type == :belongs_to))
|> Enum.map(& &1.source_field)
action =
case action do
action when is_atom(action) ->
Ash.Resource.Info.action(resource, action)
_ ->
action
end
allow_nil_input =
case action do
%{allow_nil_input: allow_nil_input} ->
allow_nil_input
_ ->
[]
end
resource
|> Ash.Resource.Info.attributes()
|> Enum.reject(
&(&1.allow_nil? || &1.private? || &1.generated? || &1.name in belongs_to ||
&1.name in allow_nil_input)
)
end
@doc """
Wraps a function in the before/after action hooks of a changeset.
The function takes a changeset and if it returns
`{:ok, result}`, the result will be passed through the after
action hooks.
"""
@spec with_hooks(
t(),
(t() ->
{:ok, term, %{notifications: list(Ash.Notifier.Notification.t())}}
| {:error, term})
) ::
{:ok, term, t(), %{notifications: list(Ash.Notifier.Notification.t())}} | {:error, term}
def with_hooks(%{valid?: false} = changeset, _func) do
{:error, changeset.errors}
end
def with_hooks(changeset, func) do
{changeset, %{notifications: before_action_notifications}} =
Enum.reduce_while(
changeset.before_action,
{changeset, %{notifications: []}},
fn before_action, {changeset, instructions} ->
case before_action.(changeset) do
{changeset, %{notifications: notifications}} ->
cont =
if changeset.valid? do
:cont
else
:halt
end
{cont,
{changeset,
%{
instructions
| notifications: instructions.notifications ++ List.wrap(notifications)
}}}
changeset ->
cont =
if changeset.valid? do
:cont
else
:halt
end
{cont, {changeset, instructions}}
end
end
)
if changeset.valid? do
case func.(changeset) do
{:ok, result, instructions} ->
run_after_actions(