Class: OnlineMigrations::CommandChecker

Inherits:
Object
  • Object
show all
Defined in:
lib/online_migrations/command_checker.rb

Class Attribute Summary collapse

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(migration) ⇒ CommandChecker

Returns a new instance of CommandChecker.



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# File 'lib/online_migrations/command_checker.rb', line 23

def initialize(migration)
  @migration = migration
  @new_tables = []
  @new_columns = []
  @lock_timeout_checked = false
  @foreign_key_tables = Set.new
  @removed_indexes = []
end

Class Attribute Details

.safe ⇒ Object

Returns the value of attribute safe.



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# File 'lib/online_migrations/command_checker.rb', line 10

def safe
  @safe
end

Instance Attribute Details

#direction ⇒ Object

Returns the value of attribute direction.



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# File 'lib/online_migrations/command_checker.rb', line 21

def direction
  @direction
end

Class Method Details

.safety_assured ⇒ Object 



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# File 'lib/online_migrations/command_checker.rb', line 12

def safety_assured
  prev_value = safe
  self.safe = true
  yield
ensure
  self.safe = prev_value
end

Instance Method Details

#check(command, *args, &block) ⇒ Object 



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# File 'lib/online_migrations/command_checker.rb', line 32

def check(command, *args, &block)
  check_database_version
  set_statement_timeout
  check_lock_timeout

  if !safe?
    do_check(command, *args, &block)

    run_custom_checks(command, args)

    if @foreign_key_tables.count { |t| !new_table?(t) } > 1
      raise_error :multiple_foreign_keys
    end
  end

  true
end

#version_safe? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/online_migrations/command_checker.rb', line 51

def version_safe?
  version && version <= OnlineMigrations.config.start_after
end