Class: ClientSideValidations::ActiveRecord::Middleware

Inherits:
Object
  • Object
show all
Defined in:
lib/client_side_validations/active_record/middleware.rb

Class Method Summary collapse

Class Method Details

.class?(klass) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/client_side_validations/active_record/middleware.rb', line 4

def self.class?(klass)
  klass.abstract_class.blank? && klass < ::ActiveRecord::Base
end

.find_topmost_superclass(klass) ⇒ Object 



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# File 'lib/client_side_validations/active_record/middleware.rb', line 44

def self.find_topmost_superclass(klass)
  if class?(klass.superclass)
    find_topmost_superclass(klass.superclass)
  else
    klass
  end
end

.type_cast_value(column, value) ⇒ Object 



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# File 'lib/client_side_validations/active_record/middleware.rb', line 36

def self.type_cast_value(column, value)
  if column.respond_to?(:type_cast)
    column.type_cast(value)
  else
    column.type_cast_from_database(value)
  end
end

.unique?(klass, attribute, value, params) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/client_side_validations/active_record/middleware.rb', line 8

def self.unique?(klass, attribute, value, params)
  klass = find_topmost_superclass(klass)
  column = klass.columns_hash[attribute.to_s]
  value = type_cast_value(column, value)
  value = column.limit ? value.to_s.mb_chars[0, column.limit] : value.to_s if value.is_a?(String)

  t = klass.arel_table

  sql = []
  if params[:case_sensitive] == 'true'
    sql << 'BINARY' if t.engine.connection.adapter_name =~ /^mysql/i
    sql << t[attribute].eq(value).to_sql
  else
    escaped_value = value.gsub(/[%_]/, '\\\\\0')
    sql << "#{t[attribute].matches(escaped_value).to_sql} ESCAPE '\\'"
  end

  sql << "AND #{t[klass.primary_key].not_eq(params[:id]).to_sql}" if params[:id]

  (params[:scope] || {}).each do |scope_attribute, scope_value|
    scope_value = type_cast_value(klass.columns_hash[scope_attribute], scope_value)
    sql << "AND #{t[scope_attribute].eq(scope_value).to_sql}"
  end

  relation = Arel::Nodes::SqlLiteral.new(sql.join(' '))
  !klass.where(relation).exists?
end