Module: RelationToStruct::ActiveRecordBaseExtension::ClassMethods

Defined in:
lib/relation_to_struct/active_record_base_extension.rb

Instance Method Summary collapse

Instance Method Details

#pluck_from_sql(sql, binds = []) ⇒ Object 



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# File 'lib/relation_to_struct/active_record_base_extension.rb', line 27

def pluck_from_sql(sql, binds=[])
  result = connection.select_all(sanitize_sql(sql, nil), "Pluck SQL Load", binds)
  result.cast_values()
end

#structs_from_sql(struct_class, sql, binds = []) ⇒ Object 



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# File 'lib/relation_to_struct/active_record_base_extension.rb', line 5

def structs_from_sql(struct_class, sql, binds=[])
  result = connection.select_all(sanitize_sql(sql, nil), "Structs SQL Load", binds)

  if result.columns.size != result.columns.uniq.size
    raise ArgumentError, 'Expected column names to be unique'
  end

  if result.columns != struct_class.members.collect(&:to_s)
    raise ArgumentError, 'Expected column names (and their order) to match struct attribute names'
  end

  if result.columns.size == 1
    result.cast_values().map do |tuple|
      struct_class.new(tuple)
    end
  else
    result.cast_values().map do |tuple|
      struct_class.new(*tuple)
    end
  end
end

#tuple_from_sql(sql, binds = []) ⇒ Object 



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# File 'lib/relation_to_struct/active_record_base_extension.rb', line 47

def tuple_from_sql(sql, binds=[])
  result = connection.select_all(sanitize_sql(sql, nil), "Value SQL Load", binds)
  values = result.cast_values()

  case values.size
  when 0
    nil
  when 1
    result.columns.size == 1 ? values : values[0]
  else
    raise ArgumentError, 'Expected only a single result to be returned'
  end
end

#value_from_sql(sql, binds = []) ⇒ Object

Raises:

  • (ArgumentError) 


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# File 'lib/relation_to_struct/active_record_base_extension.rb', line 32

def value_from_sql(sql, binds=[])
  result = connection.select_all(sanitize_sql(sql, nil), "Value SQL Load", binds)
  raise ArgumentError, 'Expected exactly one column to be selected' unless result.columns.size == 1

  values = result.cast_values()
  case values.size
  when 0
    nil
  when 1
    values[0]
  else
    raise ArgumentError, 'Expected only a single result to be returned'
  end
end