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Version: 1.8

Service call and result of work

Service call​

Services can only be called via .call and .call! methods.

Via .call!​

The .call! method will fail if it catches any exception.

UsersService::Accept.call!(user: User.first)

Via .call​

The .call method will only fail if it catches an exception in the input arguments. Internal and output attributes, as well as methods for failures — all this will be collected in the result.

UsersService::Accept.call(user: User.first)

Result​

All services have the result of their work. For example, in case of success this call:

service_result = UsersService::Accept.call(user: User.first)

Will return this:

#<Servactory::Result @user=...>

And then work with thе result in this way:

Notification::SendJob.perform_later(service_result.user.id)

Result content​

Output attributes​

Anything that has been added via the output method in the service will be available in Result.

Outputs in Result have predicate methods similar to those inside a service.

Helpers​

As a result of the work of the service, there are success? and failure? methods, which can help determine the result of the work for further processing.

service_result.success? # => true
service_result.failure? # => false

Error​

Error information can be obtained through the error method.

service_result.error

# => <ApplicationService::Errors::Failure: Invalid invoice number>

Info​

From outside the service, can get information about its input, internal, and output attributes.

It is valuable, when implementing complex class handling, for example.

For example, the following attributes are described in a service:

class BuildFullName < ApplicationService::Base
  input :first_name, type: String
  input :middle_name, type: String, required: false
  input :last_name, type: String

  internal :prepared_full_name, type: String

  output :full_name, type: String

  # ...
end

Get information about them in the following ways:

BuildFullName.info

# => <Servactory::Info::Result:0x00000001118c7078 @inputs=[:first_name, :middle_name, :last_name], @internals=[:prepared_full_name], @outputs=[:full_name]>
BuildFullName.info.inputs

# => [:first_name, :middle_name, :last_name]
BuildFullName.info.internals

# => [:prepared_full_name]
BuildFullName.info.outputs

# => [:full_name]