Module: PassiveColumns

Extended by:
ActiveSupport::Concern
Defined in:
lib/passive_columns.rb,
lib/passive_columns/loader.rb,
lib/passive_columns/railtie.rb,
lib/passive_columns/version.rb,
lib/passive_columns/active_record_relation_extension.rb

Overview

:nodoc:

Defined Under Namespace

Modules: ActiveRecordRelationExtension Classes: Loader, Railtie

Constant Summary collapse

VERSION = 
'0.3.5'

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.apply_select_scope_to(relation) ⇒ void

This method returns an undefined value.

This method is used to apply the select scope to the relation. It is used to automatically select all columns except passive columns if no columns are selected.

Parameters:

  • relation (ActiveRecord::Relation) 


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# File 'lib/passive_columns.rb', line 144

def self.apply_select_scope_to(relation)
  return if relation.klass.try(:_passive_columns).blank?
  return if relation.select_values.present?

  relation.select_values = relation.klass.column_names - relation.klass._passive_columns
end

Instance Method Details

#_passive_column_loader ⇒ Object 



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# File 'lib/passive_columns.rb', line 166

def _passive_column_loader
  @_passive_column_loader ||= PassiveColumns::Loader.new(self, _passive_columns)
end

#load_column(column) ⇒ any

This method loads a column value, if not already loaded, from the database regardless of whether the column is added to “passive_columns” or not.

It uses the Rails’ “.pick” method to get the value of the column under the hood

user = User.select('id').take!
user.load_column(:name) # => SELECT "name" FROM "users" WHERE "id" = ? LIMIT ?
'John'
user.load_column(:name)
'John'

Parameters:

  • column (Symbol, String)

Returns:

  • (any) 


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# File 'lib/passive_columns.rb', line 162

def load_column(column)
  _passive_column_loader.load(column, force: true)
end