Module: DynamicMigrations::ActiveRecord::Migrators::Validation

Included in:
DynamicMigrations::ActiveRecord::Migrators
Defined in:
lib/dynamic_migrations/active_record/migrators/validation.rb

Instance Method Summary collapse

Instance Method Details

#add_validation(table_name, name:, initially_deferred: false, deferrable: false, comment: nil, &block) ⇒ Object

this exists because because the standard rails migration does not support deffered constraints



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# File 'lib/dynamic_migrations/active_record/migrators/validation.rb', line 6

def add_validation table_name, name:, initially_deferred: false, deferrable: false, comment: nil, &block
  unless block
    raise MissingFunctionBlockError, "create_function requires a block"
  end
  # todo - remove this once steep/rbs can better handle blocks
  unless block.is_a? NilClass
    sql = block.call.strip
  end

  if initially_deferred == true && deferrable == false
    raise DeferrableOptionsError, "A constraint can only be initially deferred if it is also deferrable"
  end

  # allow it to be deferred, and defer it by default
  deferrable_sql = if initially_deferred
    "DEFERRABLE INITIALLY DEFERRED"

  # allow it to be deferred, but do not deferr by default
  elsif deferrable
    "DEFERRABLE INITIALLY IMMEDIATE"

  # it can not be deferred (this is the default)
  else
    "NOT DEFERRABLE"
  end

  execute "    ALTER TABLE \#{table_name}\n      ADD CONSTRAINT \#{name}\n        CHECK (\#{sql})\n        \#{deferrable_sql};\n  SQL\n\n  if comment.is_a? String\n    set_validation_comment table_name, name, comment\n  end\nend\n"

#remove_validation(table_name, name) ⇒ Object 



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# File 'lib/dynamic_migrations/active_record/migrators/validation.rb', line 44

def remove_validation table_name, name
  execute "    ALTER TABLE \#{table_name}\n      DROP CONSTRAINT \#{name};\n  SQL\nend\n"

#remove_validation_comment(table_name, validation_name) ⇒ Object

remove a validation comment



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# File 'lib/dynamic_migrations/active_record/migrators/validation.rb', line 59

def remove_validation_comment table_name, validation_name
  execute "    COMMENT ON CONSTRAINT \#{validation_name} ON \#{schema_name}.\#{table_name} IS NULL;\n  SQL\nend\n"

#set_validation_comment(table_name, validation_name, comment) ⇒ Object

add a comment to the validation



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# File 'lib/dynamic_migrations/active_record/migrators/validation.rb', line 52

def set_validation_comment table_name, validation_name, comment
  execute "    COMMENT ON CONSTRAINT \#{validation_name} ON \#{schema_name}.\#{table_name} IS \#{quote comment};\n  SQL\nend\n"