Module: DynamicMigrations::Postgres::Generator::Validation

Included in:
DynamicMigrations::Postgres::Generator
Defined in:
lib/dynamic_migrations/postgres/generator/validation.rb

Defined Under Namespace

Classes: TemplateAlreadyExistsError, UnexpectedTemplateError

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.add_template(name, template_class) ⇒ Object

install a template into the migration generator, this can be used from outside this library to clean up common migrations (replace common migrations with syntatic sugar)

Raises:



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# File 'lib/dynamic_migrations/postgres/generator/validation.rb', line 21

def self.add_template name, template_class
  @templates ||= {}
  raise TemplateAlreadyExistsError, name if @templates.key?(name)
  @templates[name] = template_class
end

.has_template?(template_name) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/dynamic_migrations/postgres/generator/validation.rb', line 15

def self.has_template? template_name
  @templates&.key?(template_name) || false
end

.template(template_name) ⇒ Object 



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# File 'lib/dynamic_migrations/postgres/generator/validation.rb', line 11

def self.template template_name
  @templates && @templates[template_name]
end

Instance Method Details

#add_validation(validation, code_comment = nil) ⇒ Object 



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# File 'lib/dynamic_migrations/postgres/generator/validation.rb', line 27

def add_validation validation, code_comment = nil
  # if we have a corresponding template, then use it
  if validation.template
    unless (template_class = Validation.template(validation.template))
      raise UnexpectedTemplateError, "Unrecognised template #{validation.template}"
    end

    arguments = template_class.new(validation, code_comment).fragment_arguments
    add_fragment(**arguments)

  # no template, process this as a default validation (takes all options)
  else

    options = {
      name: ":#{validation.name}"
    }

    if validation.description.nil?
      comment_sql = ""
    else
      comment_sql = "        \#{validation.name}_comment = <<~COMMENT\n          \#{indent validation.description || \"\"}\n        COMMENT\n      RUBY\n      options[:comment] = \"\#{validation.name}_comment\"\n    end\n\n    options_syntax = options.map { |k, v| \"\#{k}: \#{v}\" }.join(\", \")\n\n    validation_sql = validation.check_clause.strip\n\n    add_fragment schema: validation.table.schema,\n      table: validation.table,\n      migration_method: :add_validation,\n      object: validation,\n      code_comment: code_comment,\n      migration: comment_sql + <<~RUBY\n        add_validation :\#{validation.table.name}, \#{options_syntax} do\n          <<~SQL\n            \#{indent validation_sql}\n          SQL\n        end\n      RUBY\n  end\nend\n"

#recreate_validation(original_validation, updated_validation) ⇒ Object 



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# File 'lib/dynamic_migrations/postgres/generator/validation.rb', line 85

def recreate_validation original_validation, updated_validation
  # remove the original validation
  removal_fragment = remove_validation original_validation, "    Removing original validation because it has changed (it is recreated below)\n    Changes:\n      \#{indent original_validation.differences_descriptions(updated_validation).join(\"\\n\")}\n  CODE_COMMENT\n\n  # recrete the validation with the new options\n  recreation_fragment = add_validation updated_validation, <<~CODE_COMMENT\n    Recreating this validation\n  CODE_COMMENT\n\n  # return the new fragments (the main reason to return them here is for the specs)\n  [removal_fragment, recreation_fragment]\nend\n"

#remove_validation(validation, code_comment = nil) ⇒ Object 



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# File 'lib/dynamic_migrations/postgres/generator/validation.rb', line 74

def remove_validation validation, code_comment = nil
  add_fragment schema: validation.table.schema,
    table: validation.table,
    migration_method: :remove_validation,
    object: validation,
    code_comment: code_comment,
    migration: "      remove_validation :\#{validation.table.name}, :\#{validation.name}\n    RUBY\nend\n"

#remove_validation_comment(validation, code_comment = nil) ⇒ Object

remove the comment from a validation



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# File 'lib/dynamic_migrations/postgres/generator/validation.rb', line 123

def remove_validation_comment validation, code_comment = nil
  add_fragment schema: validation.table.schema,
    table: validation.table,
    migration_method: :remove_validation_comment,
    object: validation,
    code_comment: code_comment,
    migration: "      remove_validation_comment :\#{validation.table.name}, :\#{validation.name}\n    RUBY\nend\n"

#set_validation_comment(validation, code_comment = nil) ⇒ Object

add a comment to a validation



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# File 'lib/dynamic_migrations/postgres/generator/validation.rb', line 103

def set_validation_comment validation, code_comment = nil
  description = validation.description

  if description.nil?
    raise MissingDescriptionError, "Missing required description for validation `#{validation.name}` in table `#{validation.table.schema.name}.#{validation.table.name}`"
  end

  add_fragment schema: validation.table.schema,
    table: validation.table,
    migration_method: :set_validation_comment,
    object: validation,
    code_comment: code_comment,
    migration: "      set_validation_comment :\#{validation.table.name}, :\#{validation.name}, <<~COMMENT\n        \#{indent description}\n      COMMENT\n    RUBY\nend\n"