Class: ROM::Command

Inherits:
Object
  • Object
show all
Extended by:
Dry::Core::ClassAttributes, ClassInterface
Includes:
Commands
Defined in:
core/lib/rom/command.rb,
core/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

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 'core/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 'core/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 'core/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 'core/lib/rom/command.rb', line 216

option :input

#relation ⇒ Relation (readonly)

Returns Command's relation.

Returns:



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

option :result, type: Result

#source ⇒ Relation (readonly)

Returns The source relation.

Returns:



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

option :type, type: CommandType, optional: true

Class Method Details

.[](adapter) ⇒ Class Originally defined in module ClassInterface

Return adapter specific sub-class based on the adapter identifier

This is a syntax sugar to make things consistent

Examples:

ROM::Commands::Create[:memory]
# => ROM::Memory::Commands::Create

Parameters:

  • adapter (Symbol) —

    identifier

Returns:

  • (Class)

.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 'core/lib/rom/command.rb', line 59

defines :adapter

#after(hook) ⇒ Array<Hash, Symbol> #after(hook_opts) ⇒ Array<Hash, Symbol> Originally defined in module ClassInterface

Set after-execute hooks

Overloads:

  • #after(hook) ⇒ Array<Hash, Symbol>

    Set an after hook as a method name

    Examples:

    class CreateUser < ROM::Commands::Create[:sql]
  relation :users
  register_as :create

  after :my_hook

  def my_hook(tuple, *)
    puts "hook called#
  end
end
  • #after(hook_opts) ⇒ Array<Hash, Symbol>

    Set an after hook as a method name with arguments

    Examples:

    class CreateUser < ROM::Commands::Create[:sql]
  relation :users
  register_as :create

  after my_hook: { arg1: 1, arg1: 2 }

  def my_hook(tuple, arg1:, arg2:)
    puts "hook called with args: #{arg1} and #{arg2}"
  end
end

    Parameters:

    • hook (Hash<Symbol=>Hash>) —

      Options with method name and pre-set args

Returns:

  • (Array<Hash, Symbol>) —

    A list of all configured after hooks

#before(hook) ⇒ Array<Hash, Symbol> #before(hook_opts) ⇒ Array<Hash, Symbol> Originally defined in module ClassInterface

Set before-execute hooks

Overloads:

  • #before(hook) ⇒ Array<Hash, Symbol>

    Set an before hook as a method name

    Examples:

    class CreateUser < ROM::Commands::Create[:sql]
  relation :users
  register_as :create

  before :my_hook

  def my_hook(tuple, *)
    puts "hook called#
  end
end
  • #before(hook_opts) ⇒ Array<Hash, Symbol>

    Set an before hook as a method name with arguments

    Examples:

    class CreateUser < ROM::Commands::Create[:sql]
  relation :users
  register_as :create

  before my_hook: { arg1: 1, arg2: 2 }

  def my_hook(tuple, arg1:, arg2:)
    puts "hook called with args: #{arg1} and #{arg2}"
  end
end

    Parameters:

    • hook (Hash<Symbol=>Hash>) —

      Options with method name and pre-set args

Returns:

  • (Array<Hash, Symbol>) —

    A list of all configured before hooks

.build(relation, **options) ⇒ Command Originally defined in module ClassInterface

Build a command class for a specific relation with options

Examples:

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

command = CreateUser.build(rom.relations[:users])

Parameters:

Returns:

.create_class(name, type) {|Class| ... } ⇒ Class, Object Originally defined in module ClassInterface

Create a command class with a specific type

Parameters:

  • name (Symbol) —

    Command name

  • type (Class) —

    Command class

Yields:

  • (Class)

Returns:

  • (Class, Object)

.extend_for_relation(relation) ⇒ Class Originally defined in module ClassInterface

Extend a command class with relation view methods

Parameters:

Returns:

  • (Class)

.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 'core/lib/rom/command.rb', line 141

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


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

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


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

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


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# File 'core/lib/rom/command.rb', line 113

defines :result

.use(plugin, **options) ⇒ Object Originally defined in module ClassInterface

Use a configured plugin in this relation

Examples:

class CreateUser < ROM::Commands::Create[:memory]
  use :pagintion

  per_page 30
end

Parameters:

  • plugin (Symbol)
  • options (Hash)

Options Hash (**options):

  • :adapter (Symbol) — default: :default —

    first adapter to check for plugin

Instance Method Details

#after_hooks ⇒ Array

List of after hooks

Returns:

  • (Array) 


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# File 'core/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 'core/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 'core/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.empty?
          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:

  • (Command::Graph) 


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

def curried?
  !curry_args.empty?
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 'core/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

#gateway ⇒ Symbol

Return gateway of this command's relation

Returns:

  • (Symbol) 


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

def gateway
  relation.gateway
end

#name ⇒ ROM::Relation::Name

Return name of this command's relation

Returns:

  • (ROM::Relation::Name) 


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

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