はじめに

Dockerで、rails-erbを使いER図を作成しようとしたが、Graphvizが必要だとErrorが出た時の対応
文字化け出力された時の対応

やりたい事

rails-erdでER図を作成

環境

Rails version: 6.1.3
Ruby version: ruby 3.0.0p0 (2020-12-25 revision 95aff21468)[aarch64-linux-musl]
mariadb:10.5.8

やったこと

bundle exec erd を実行するもError

# Error
bash-5.0# bundle exec erd
Loading application in 'rails_app'...
ruby/3.0.0 isn't supported by this pry-doc version
Generating entity-relationship diagram for 17 models...
Warning: Ignoring invalid model ActionText::RichText (table action_text_rich_texts does not exist)
Warning: Ignoring invalid model ActionMailbox::InboundEmail (table action_mailbox_inbound_emails does not exist)
Warning: Ignoring invalid model ActiveStorage::Attachment (table active_storage_attachments does not exist)
Warning: Ignoring invalid model ActiveStorage::Blob (table active_storage_blobs does not exist)
Warning: Ignoring invalid model ActiveStorage::VariantRecord (table active_storage_variant_records does not exist)
Warning: Ignoring invalid association :deliveries on User (uninitialized constant User::Delivery)
Warning: Ignoring invalid association :deliveries on Store (uninitialized constant Store::Delivery)
Failed: RuntimeError: Saving diagram failed!
Verify that Graphviz is installed and in your path, or use filetype=dot.

Error対応: graphvizをインストール

Dockerコンテナ内

$ apk add --update --no-cache graphviz

再度実行: PDF出力できたと思ったら文字化け。。。

Dockerコンテナ内

# Success
bash-5.0# bundle exec erd
Loading application in 'rails_app'...
ruby/3.0.0 isn't supported by this pry-doc version
Generating entity-relationship diagram for 17 models...
Warning: Ignoring invalid model ActionText::RichText (table action_text_rich_texts does not exist)
Warning: Ignoring invalid model ActionMailbox::InboundEmail (table action_mailbox_inbound_emails does not exist)
Warning: Ignoring invalid model ActiveStorage::Attachment (table active_storage_attachments does not exist)
Warning: Ignoring invalid model ActiveStorage::Blob (table active_storage_blobs does not exist)
Warning: Ignoring invalid model ActiveStorage::VariantRecord (table active_storage_variant_records does not exist)
Warning: Ignoring invalid association :deliveries on User (uninitialized constant User::Delivery)
Warning: Ignoring invalid association :deliveries on Store (uninitialized constant Store::Delivery)
Diagram saved to 'erd.pdf'.

参考記事を元にinstall. 中身はよう分からんです。

Dockerコンテナ内

$ apk add --update --no-cache msttcorefonts-installer \
                              fontconfig \
                              font-bitstream-type1 \
                              ghostscript-fonts \
                              ttf-freefont

$ update-ms-fonts && fc-cache -f && rm -rf /var/cache/*

再出力結果

無事文字化けせずER図出力できました 🙌

参考