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:



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# File 'lib/rom/command.rb', line 228

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:



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# File 'lib/rom/command.rb', line 224

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

#curry_args ⇒ Array (readonly)

Returns Curried args.

Returns:

  • (Array) —

    Curried args



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# File 'lib/rom/command.rb', line 220

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



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# File 'lib/rom/command.rb', line 216

option :input

#relation ⇒ Relation (readonly)

Returns Command’s relation.

Returns:



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# File 'lib/rom/command.rb', line 197

param :relation

#result ⇒ Symbol (readonly)

Returns Result type, either :one or :many.

Returns:

  • (Symbol) —

    Result type, either :one or :many



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# File 'lib/rom/command.rb', line 212

option :result, type: Result

#source ⇒ Relation (readonly)

Returns The source relation.

Returns:



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# File 'lib/rom/command.rb', line 208

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



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# File 'lib/rom/command.rb', line 204

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


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# File 'lib/rom/command.rb', line 59

defines :adapter

.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


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# File 'lib/rom/command.rb', line 168

defines :register_as

.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


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# File 'lib/rom/command.rb', line 86

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


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# File 'lib/rom/command.rb', line 193

defines :restrictable

Instance Method Details

#after_hooks ⇒ Array

List of after hooks

Returns:

  • (Array) 


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# File 'lib/rom/command.rb', line 377

def after_hooks
  options[:after]
end

#before_hooks ⇒ Array

List of before hooks

Returns:

  • (Array) 


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# File 'lib/rom/command.rb', line 368

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



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# File 'lib/rom/command.rb', line 270

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:



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# File 'lib/rom/command.rb', line 328

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

#curried? ⇒ TrueClass, FalseClass

Check if this command is curried

Returns:

  • (TrueClass, FalseClass) 


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# File 'lib/rom/command.rb', line 337

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:



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# File 'lib/rom/command.rb', line 313

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) 


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# File 'lib/rom/command.rb', line 258

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

#gateway ⇒ Symbol

Return gateway of this command’s relation

Returns:

  • (Symbol) 


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# File 'lib/rom/command.rb', line 247

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) 


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# File 'lib/rom/command.rb', line 413

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) 


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# File 'lib/rom/command.rb', line 395

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) 


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# File 'lib/rom/command.rb', line 404

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) 


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# File 'lib/rom/command.rb', line 431

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



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# File 'lib/rom/command.rb', line 447

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:



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# File 'lib/rom/command.rb', line 238

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:



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# File 'lib/rom/command.rb', line 388

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) 


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# File 'lib/rom/command.rb', line 422

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) 


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# File 'lib/rom/command.rb', line 440

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