How to get validation messages for all nested records-CodePudding

Given this models:

class Foo < ApplicationRecord
  has_many :bars
  accepts_nested_attributes_for :bars
end

class Bar < ApplicationRecord
  validates :title, presence: true
end

I want to get the validation message for each nested Bar I create, because ...

Foo.create(bars_attributes: [, { title: nil }, { title: "foo" }, { title: nil }])

... results in @errors=[#<ActiveModel::NestedError attribute=bars.title, type=blank, options={}>], but I don't know which records (in this case, records at index 0 and 2) have failed. Is this possible at all?

CodePudding user response：

Break it down. Instead of trying to do everything in one command (which can only give you a success/failure response), try something like this (assumes it's being passed the details of your required Bar records in the params as an Enumerable (i.e. array or hash)).

@foo = foo.create(field_1: foo_params[:field_1], field_2: foo_params[:field_2])
_failed_bar_records = []
foo_params[:bar_data].each do |_bar_data|
  _bar = Bar.new(foo_id: @foo.id, title: _bar_data[:title])
  _failed_bar_records.push(_bar_data[:title]) unless _bar.save
end

Then, you'll have an array _failed_bar_records that contains data about each failed record. You could obviously push more to this array, like the actual error message.

CodePudding user response：

you could dig down to nested record's errors instead of checking the parent record's errors

@problem = Problem.new(problem_params)

@problem.solutions
# [<Solution:0x0000565379c46170 id: nil, description: "a solution", problem_id: nil, ...>,
#  <Solution:0x0000565379cc2248 id: nil, description: "", problem_id: nil, ...>]

@problem.save

@problem.errors
# <ActiveModel::Errors:..
# @base= <Problem:0x0000565379c33890 ...>,
# @errors=[
#  <ActiveModel::NestedError attribute=solutions.description, type=blank, options={}>
# ]>

@problem.solutions.map(&:errors)
# [
#   <ActiveModel::Errors:...
#    @base= <Solution:0x0000565379c46170 ...>,
#    @errors=[]>,
#
#   <ActiveModel::Errors:...
#    @base= <Solution:0x0000565379cc2248 ...>,
#    @errors=[
#     <ActiveModel::Error attribute=description, type=blank, options={}>
#    ]>
# ]