Tag Archives: Rails

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Exceptions I Bumped into on Upgrading from Cells 3 to Cells 4

Wednesday November 11th, 2015 Kenji

Here are some exceptions I bumped into on upgrading from Cells 3 gem to Cells 4. ここにある対処法は、それぞれの Cell クラスに対して行ってもいいですが、 it is easier to create the parent class, ApplicationCell.

対処した最終結果は Rails: Cells 3 から Cells 4 へのアップグレードに記載しています。

Exception: undefined method `helper_method`

The following error was raised in lib/devise/controllers/helpers.rb. The version of device gem I used at that time was 3.5.2.

undefined method `helper_method’ for XyzCell:Class

Add the following code to Cell class.

def self.helper_method(*)
end

1 2	def self.helper_method(*) end

It is empty method but there’s no problem. With Cells 3, we have to call self.helper_method but with Cells 4 we don’t have to do that and its method was removed.

Reference: apotonick/cells Issue Not working with react-rails

Exception in `dom_class`

The following exception may occur.

undefined method `dom_class’ for #<XyzCell:0x007ff36d4fecb0>

Add the following code to Cell class.

def dom_class(record, prefix = nil)
ActionView::RecordIdentifier.dom_class(record, prefix)
end
def dom_id(record, prefix = nil)
ActionView::RecordIdentifier.dom_id(record, prefix)
end

def dom_class(record, prefix = nil)

ActionView::RecordIdentifier.dom_class(record, prefix)

end

def dom_id(record, prefix = nil)

ActionView::RecordIdentifier.dom_id(record, prefix)

end

Reference: apotonick/cells Troubleshooting

Exception concerns `number_with_delimiter` is raised

Add include ActionView::Helpers::NumberHelper to Cell class.

Exception because of `select` tag can’t be used

The following message will be shown.

private method `select’ called for #<XyzCell:0x007ff48f4febe8>

Add include ActionView::Helpers::FormOptionsHelper to Cell class.

Reference: apotonick/cells Issue select form_helper doesn’t work in cells 4

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Rails: Upgrade Cells 3 to Cells 4

Code

Rails: How to Solve devise error undefined method failure_app for nil class

Tuesday November 10th, 2015 Kenji

I bumped into the following error when I was creating API program. The origin was devise gem.

NoMethodError (undefined method `failure_app’ for nil:NilClass)

Environment

Ruby 2.2.3p173
Rails 4.2.4
devise 3.5.2

Origin

I used sign_in method for unauthorized user.

The API in construction, we have to make unauthorized user able to login, so I wrote logging in procedure for all users, including unauthorized users. Then, devise and warden rejected unauthorized user and raised error.

Solution

Write the following setting into config/initializer/devise.rb.

config.allow_unconfirmed_access_for = 2000.years

1	config.allow_unconfirmed_access_for = 2000.years

Or write the following method into the model class that is used by devise for authentication. User class for example.

private
def confirmation_period_valid?
return true
end

private

def confirmation_period_valid?

return true

end

I recommend latter solution.

`confirmation_period_valid?`

confirmation_period_valid? method is defined at the module Devise::Models::Confirmable of devise gem.

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Code

Rails: Upgrade Cells 3 to Cells 4

Thursday November 5th, 2015 Kenji

In Rails, I upgraded Cells gem from 3.11.3 to 4.0.2. And I upgraded Rails from 4.1.9 to 4.2.4 together. Here, I wrote what I did about Cells upgrade.

Basic instruction is in From Cells 3 to Cells 4 Upgrading Guide. It’s not easy to upgrade it.

Environment

Ruby 2.2.3
Template Engine: Slim

Story

ある人が外注に出していたプログラムをなぜか私がデザイン、マークアップ含めて更新することになり、 Rails と Gem のバージョンを更新した。

その Rails のアプリケーションにテストコードは一切なかった。

リリース前のプログラムに対して変更を行いました。

What I did

Create ApplicationCell
Change helper to include
Change render_cell to cell
Change file name
Change partial view rendering way

Create ApplicationCell

If you use functions relates to device or form tags, the application will stop working after upgrading to Cells 4. Then I created ApplicationCell as a parent class of all Cell class.

アプリケーションを見ながら次のような ApplicationCell を作りました。 include で取り込んでいるモジュールは、エラーが出る度に順次取り込んでいったものです。

class ApplicationCell < Cell::ViewModel
include Cell::Slim
include ActionView::Helpers::DateHelper
include ActionView::Helpers::TextHelper
include ActionView::Helpers::NumberHelper
include ActionView::Helpers::FormHelper
include ActionView::Helpers::FormOptionsHelper
include ERB::Util
def self.helper_method(*)
end
def dom_class(record, prefix = nil)
ActionView::RecordIdentifier.dom_class(record, prefix)
end
def dom_id(record, prefix = nil)
ActionView::RecordIdentifier.dom_id(record, prefix)
end
end

class ApplicationCell < Cell::ViewModel

include Cell::Slim

include ActionView::Helpers::DateHelper

include ActionView::Helpers::TextHelper

include ActionView::Helpers::NumberHelper

include ActionView::Helpers::FormHelper

include ActionView::Helpers::FormOptionsHelper

include ERB::Util

def self.helper_method(*)

end

def dom_class(record, prefix = nil)

ActionView::RecordIdentifier.dom_class(record, prefix)

end

def dom_id(record, prefix = nil)

ActionView::RecordIdentifier.dom_id(record, prefix)

end

self.helper_method is called by devise, so it is necessary. Cells では既に意味のないメソッドになっているので、何も処理は行いません。

Change helper to include

In each cell class, there was a line “helper ApplicationHelper“.

Webrick を実行してページを開くと undefined method と表示されました。 Then, change helper statement to include statement with sed command.

Change render_cell to cell

Cells 4 からメソッドが変わりました。ビューの中で使用されている render_cell を cell に書き換えました。

いままで書いていた人がコードを綺麗に保っていたので、 sedコマンドを使って簡単に変更できました。書き方が何通りもある場合は、簡単にはいきません。

Before

= render_cell :cell_name, :method_name, option_1: 1, option_2: 2

1	= render_cell :cell_name, :method_name, option_1: 1, option_2: 2

After

= cell(:cell_name).(:method_name, option_1: 1, option_2: 2)

1	= cell(:cell_name).(:method_name, option_1: 1, option_2: 2)

Change file name

There were cell templates named like method_name.html.slim, but Cells 4 method cell(:cell_name).(:method_name) search template named method_name.slim. It caused exception.

In cells/lib/cell/view_model.rb of Cells 4, find_template method generates template name. Generated template name by that method doesn’t contain the string 'html'.

I removed “html” from template file name.

Change partial view rendering way

I know what I did is quick and dirty way.

In old code, cell template renders partial view app/views/shared/something.html.slim.

Before

= render partial: 'shared/something', locals: {something: true}

1	= render partial: 'shared/something', locals: {something: true}

But it doesn’t work in Cells 4.

cells/lib/cell/templates.rb と cells/lib/cell/view_model.rb を見ながら次のようにコードを変更しました。

After

= render prefixes: ['app/views'], view: 'shared/_something.html', locals: {something: true}

1	= render prefixes: ['app/views'], view: 'shared/_something.html', locals: {something: true}

I had not only to create prefixes and view value, but change view value.

app/views内のテンプレートを呼び出す際のメソッドを ApplicationCell に作ったほうがよかったかもしれません。

Cell の中に self.view_paths += ['app/views'] を加えると、 app/views/cell_name の中でテンプレートを探すようになります。つまり、次のように変更しても動くようになります。

Alternative

= render view: '../shared/_something.html', locals: {something: true}

1	= render view: '../shared/_something.html', locals: {something: true}

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RSpec: Test Helper Method using current_user function

Thursday October 15th, 2015 Kenji

I’ll introduce the way to test rails helper code that uses current_user method provided by device gem.

Environment

Ruby 2.2.2
Rails 4.1.8
RSpec 3.1.0

Test Target

The function we are going to test is below. It compare the return value of current_user method and user_id given as argument, and check the argument user_id is of current login user or not.

module ExampleHelper
# check if the id is of current user
# ==== Parameter
# * +user_id+
# ==== Return
# Boolean
def is_current_user?(user_id)
if current_user && current_user.id == user_id
return true
end
return false
end
end

module ExampleHelper

# check if the id is of current user

# ==== Parameter

# * +user_id+

# ==== Return

# Boolean

def is_current_user?(user_id)

if current_user && current_user.id == user_id

return true

end

return false

end

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The Life

Tag Archives: Rails

(日本語) Rails application.js を application.js.coffee や application.js.erb にする

Readers who viewed this page, also viewed:

Exceptions I Bumped into on Upgrading from Cells 3 to Cells 4

Exception: undefined method `helper_method`

Exception in `dom_class`

Exception concerns `number_with_delimiter` is raised

Exception because of `select` tag can’t be used

Readers who viewed this page, also viewed:

Rails: How to Solve devise error undefined method failure_app for nil class

Environment

Origin

Solution

`confirmation_period_valid?`

Readers who viewed this page, also viewed:

Rails: Upgrade Cells 3 to Cells 4

Environment

Story

What I did

Create ApplicationCell

Change helper to include

Change render_cell to cell

Before

After

Change file name

Change partial view rendering way

Before

After

Alternative

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RSpec: Test Helper Method using current_user function

Environment

Test Target

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Exception: undefined method helper_method

Exception in dom_class

Exception concerns number_with_delimiter is raised

Exception because of select tag can’t be used

Readers who viewed this page, also viewed:

Environment

Origin

Solution

confirmation_period_valid?

Readers who viewed this page, also viewed:

Environment

Story

What I did

Create ApplicationCell

Change helper to include

Change render_cell to cell

Before

After

Change file name

Change partial view rendering way

Before

After

Alternative

Readers who viewed this page, also viewed:

Environment

Test Target

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A Life Summary of an Gypsy

Exception: undefined method `helper_method`

Exception in `dom_class`

Exception concerns `number_with_delimiter` is raised

Exception because of `select` tag can’t be used

`confirmation_period_valid?`