Class: ROM::Command

Inherits:
Object
  • Object
show all
Extended by:
Dry::Core::ClassAttributes, ClassInterface, Initializer
Includes:
Commands, Pipeline::Operator
Defined in:
lib/rom/command.rb,
lib/rom/commands/class_interface.rb

Overview

Base command class with factory class-level interface and setup-related logic

Defined Under Namespace

Modules: ClassInterface

Constant Summary collapse

CommandType = 
Types::Strict::Symbol.enum(:create, :update, :delete)
Result = 
Types::Strict::Symbol.enum(:one, :many)

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Methods included from Initializer

extended

Methods included from ClassInterface

adapter_namespace, build, create_class, default_name, extend_for_relation, extended, inherited, options, relation_methods_mod, set_hooks, use

Methods included from Pipeline::Operator

#>>

Instance Attribute Details

#after(*hooks) ⇒ Command (readonly)

Return a new command with appended after hooks

Parameters:

  • hooks (Array<Hash>) —

    A list of after hooks configurations

Returns:



230
 
# File 'lib/rom/command.rb', line 230

option :after, Types::Coercible::Array, reader: false, default: -> { self.class.after }

#before(*hooks) ⇒ Command (readonly)

Return a new command with appended before hooks

Parameters:

  • hooks (Array<Hash>) —

    A list of before hooks configurations

Returns:



226
 
# File 'lib/rom/command.rb', line 226

option :before, Types::Coercible::Array, reader: false, default: -> { self.class.before }

#curry_args ⇒ Array (readonly)

Returns Curried args.

Returns:

  • (Array) —

    Curried args



222
 
# File 'lib/rom/command.rb', line 222

option :curry_args, default: -> { EMPTY_ARRAY }

#input ⇒ Proc, #call (readonly)

Returns Tuple processing function, typically uses Relation#input_schema.

Returns:

  • (Proc, #call) —

    Tuple processing function, typically uses Relation#input_schema



218
 
# File 'lib/rom/command.rb', line 218

option :input

#relation ⇒ Relation (readonly)

Returns Command’s relation.

Returns:



199
 
# File 'lib/rom/command.rb', line 199

param :relation

#result ⇒ Symbol (readonly)

Returns Result type, either :one or :many.

Returns:

  • (Symbol) —

    Result type, either :one or :many



214
 
# File 'lib/rom/command.rb', line 214

option :result, type: Result

#source ⇒ Relation (readonly)

Returns The source relation.

Returns:



210
 
# File 'lib/rom/command.rb', line 210

option :source, default: -> { relation }

#type ⇒ Symbol (readonly)

Returns The command type, one of :create, :update or :delete.

Returns:

  • (Symbol) —

    The command type, one of :create, :update or :delete



206
 
# File 'lib/rom/command.rb', line 206

option :type, type: CommandType, optional: true

Class Method Details

.adapter ⇒ Symbol .adapter(identifier) ⇒ Object

Get or set adapter identifier

Overloads:

  • .adapter ⇒ Symbol

    Get adapter identifier

    Examples:

    ROM::Memory::Commands::Create.adapter
# => :memory

    Returns:

    • (Symbol)
  • .adapter(identifier) ⇒ Object

    Set adapter identifier. This must always match actual adapter identifier that was used to register an adapter.

    Examples:

    module MyAdapter
  class CreateCommand < ROM::Commands::Memory::Create
    adapter :my_adapter
  end
end



61
 
# File 'lib/rom/command.rb', line 61

defines :adapter

.input ⇒ Proc, #call .input(identifier) ⇒ Object

Get or set input processing function. This is typically set during setup to relation’s input_schema

Overloads:

  • .input ⇒ Proc, #call

    Get input processing function

    Examples:

    class CreateUser < ROM::Commands::Create[:memory]
  input -> tuple { .. }
end

CreateUser.input
# Your custom function

    Returns:

  • .input(identifier) ⇒ Object

    Set input processing function

    Examples:

    class CreateUser < ROM::Commands::Create[:memory]
  input -> tuple { .. }
end



143
 
# File 'lib/rom/command.rb', line 143

defines :input

.register_as ⇒ Symbol .register_as(identifier) ⇒ Object

Get or set identifier that should be used to register a command in a container

Overloads:

  • .register_as ⇒ Symbol

    Get registration identifier

    Examples:

    class CreateUser < ROM::Commands::Create[:memory]
  register_as :create_user
end

CreateUser.register_as
# => :create_user

    Returns:

    • (Symbol)
  • .register_as(identifier) ⇒ Object

    Set registration identifier

    Examples:

    class CreateUser < ROM::Commands::Create[:memory]
  register_as :create_user
end



170
 
# File 'lib/rom/command.rb', line 170

defines :register_as

.relation ⇒ Symbol .relation(identifier) ⇒ Object

Get or set relation identifier

Overloads:

  • .relation ⇒ Symbol

    Get relation identifier

    Examples:

    class CreateUser < ROM::Commands::Create[:memory]
  relation :users
end

CreateUser.relation
# => :users

    Returns:

    • (Symbol)
  • .relation(identifier) ⇒ Object

    Set relation identifier.

    Examples:

    class CreateUser < ROM::Commands::Create[:memory]
  relation :users
end



88
 
# File 'lib/rom/command.rb', line 88

defines :relation

.restrictable ⇒ FalseClass, TrueClass .restrictable(value) ⇒ Object

Overloads:

  • .restrictable ⇒ FalseClass, TrueClass

    Check if a command class is restrictable

    Examples:

    class UpdateUser < ROM::Commands::Update[:memory]
  restrictable true
end

CreateUser.restrictable
# => true

    Returns:

    • (FalseClass, TrueClass)
  • .restrictable(value) ⇒ Object

    Set if a command is restrictable

    Examples:

    class UpdateUser < ROM::Commands::Update[:memory]
  restrictable true
end



195
 
# File 'lib/rom/command.rb', line 195

defines :restrictable

.result ⇒ Symbol .result(identifier) ⇒ Object

Get or set result type

Overloads:

  • .result ⇒ Symbol

    Get result type

    Examples:

    class CreateUser < ROM::Commands::Create[:memory]
  result :one
end

CreateUser.result
# => :one

    Returns:

    • (Symbol)
  • .result(identifier) ⇒ Object

    Set result type

    Examples:

    class CreateUser < ROM::Commands::Create[:memory]
  result :one
end



115
 
# File 'lib/rom/command.rb', line 115

defines :result

Instance Method Details

#after_hooks ⇒ Array

List of after hooks

Returns:

  • (Array) 


379
380
381
 
# File 'lib/rom/command.rb', line 379

def after_hooks
  options[:after]
end

#before_hooks ⇒ Array

List of before hooks

Returns:

  • (Array) 


370
371
372
 
# File 'lib/rom/command.rb', line 370

def before_hooks
  options[:before]
end

#call(*args, &block) ⇒ Object Also known as: []

Call the command and return one or many tuples

This method will apply before/after hooks automatically



272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
 
# File 'lib/rom/command.rb', line 272

def call(*args, &block)
  tuples =
    if hooks?
      prepared =
        if curried?
          apply_hooks(before_hooks, *(curry_args + args))
        else
          apply_hooks(before_hooks, *args)
        end

      result = prepared ? execute(prepared, &block) : execute(&block)

      if curried?
        if args.size > 0
          apply_hooks(after_hooks, result, *args)
        elsif curry_args.size > 1
          apply_hooks(after_hooks, result, curry_args[1])
        else
          apply_hooks(after_hooks, result)
        end
      else
        apply_hooks(after_hooks, result, *args[1..args.size-1])
      end
    else
      execute(*(curry_args + args), &block)
    end

  if one?
    tuples.first
  else
    tuples
  end
end

#combine(*others) ⇒ Command::Graph

Compose this command with other commands

Composed commands can handle nested input

Returns:



330
331
332
 
# File 'lib/rom/command.rb', line 330

def combine(*others)
  Graph.new(self, others)
end

#curried? ⇒ TrueClass, FalseClass

Check if this command is curried

Returns:

  • (TrueClass, FalseClass) 


339
340
341
 
# File 'lib/rom/command.rb', line 339

def curried?
  curry_args.size > 0
end

#curry(*args) ⇒ Command, Lazy

Curry this command with provided args

Curried command can be called without args. If argument is a graph input processor, lazy command will be returned, which is used for handling nested input hashes.

Returns:



315
316
317
318
319
320
321
 
# File 'lib/rom/command.rb', line 315

def curry(*args)
  if curry_args.empty? && args.first.is_a?(Graph::InputEvaluator)
    Lazy[self].new(self, *args)
  else
    self.class.build(relation, { **options, curry_args: args })
  end
end

#execute ⇒ Array

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

This method is abstract.

Execute the command

Returns:

  • (Array) —

    an array with inserted tuples

Raises:

  • (NotImplementedError) 


260
261
262
263
264
265
 
# File 'lib/rom/command.rb', line 260

def execute(*)
  raise(
    NotImplementedError,
    "#{self.class}##{__method__} must be implemented"
  )
end

#gateway ⇒ Symbol

Return gateway of this command’s relation

Returns:

  • (Symbol) 


249
250
251
 
# File 'lib/rom/command.rb', line 249

def gateway
  relation.gateway
end

#graph? ⇒ false

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Check if this command is a graph

Returns:

  • (false) 


415
416
417
 
# File 'lib/rom/command.rb', line 415

def graph?
  false
end

#hooks? ⇒ Boolean

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Check if this command has any hooks

Returns:

  • (Boolean) 


397
398
399
 
# File 'lib/rom/command.rb', line 397

def hooks?
  before_hooks.size > 0 || after_hooks.size > 0
end

#lazy? ⇒ false

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Check if this command is lazy

Returns:

  • (false) 


406
407
408
 
# File 'lib/rom/command.rb', line 406

def lazy?
  false
end

#many? ⇒ TrueClass, FalseClass

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Check if this command returns many tuples

Returns:

  • (TrueClass, FalseClass) 


433
434
435
 
# File 'lib/rom/command.rb', line 433

def many?
  result.equal?(:many)
end

#map_input_tuples(tuples, &mapper) ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Yields tuples for insertion or return an enumerator



449
450
451
452
453
454
455
456
457
 
# File 'lib/rom/command.rb', line 449

def map_input_tuples(tuples, &mapper)
  return enum_for(:with_input_tuples, tuples) unless mapper

  if tuples.respond_to? :merge
    mapper[tuples]
  else
    tuples.map(&mapper)
  end
end

#name ⇒ ROM::Relation::Name

Return name of this command’s relation

Returns:



240
241
242
 
# File 'lib/rom/command.rb', line 240

def name
  relation.name
end

#new(new_relation) ⇒ Command

Return a new command with other source relation

This can be used to restrict command with a specific relation

Returns:



390
391
392
 
# File 'lib/rom/command.rb', line 390

def new(new_relation)
  self.class.build(new_relation, {**options, source: relation})
end

#one? ⇒ TrueClass, FalseClass

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Check if this command returns a single tuple

Returns:

  • (TrueClass, FalseClass) 


424
425
426
 
# File 'lib/rom/command.rb', line 424

def one?
  result.equal?(:one)
end

#restrictible? ⇒ TrueClass, FalseClass

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Check if this command is restrictible through relation

Returns:

  • (TrueClass, FalseClass) 


442
443
444
 
# File 'lib/rom/command.rb', line 442

def restrictible?
  self.class.restrictable.equal?(true)
end