feat: Wiki の管理方法変更（#188） (#195)

Merge branch 'feature/188' of https://git.miteruzo.com/miteruzo/btrc-hub into feature/188

#188

Merge branch 'main' into feature/188

#188

#188

#188

#188

Co-authored-by: miteruzo <miteruzo@naver.com>
Reviewed-on: #195

backend/app/models/wiki_page.rb

@@ -1,80 +1,50 @@
-require 'gollum-lib'
+require 'set'
 
 
 class WikiPage < ApplicationRecord
-  belongs_to :tag, optional: true
-  belongs_to :created_user, class_name: 'User', foreign_key: 'created_user_id'
-  belongs_to :updated_user, class_name: 'User', foreign_key: 'updated_user_id'
+  has_many :wiki_revisions, dependent: :destroy
+  belongs_to :created_user, class_name: 'User'
+  belongs_to :updated_user, class_name: 'User'
+
+  has_many :redirected_from_revisions,
+           class_name: 'WikiRevision',
+           foreign_key: :redirect_page_id,
+           dependent: :nullify
 
   validates :title, presence: true, length: { maximum: 255 }, uniqueness: true
 
-  def as_json options = { }
-    self.sha = nil
-    super options
-  end
-
-  def sha= val
-    if val.present?
-      @sha = val
-      @page = wiki.page("#{ id }.md", @sha)
-    else
-      @page = wiki.page("#{ id }.md")
-      @sha = @page.versions.first.id
-    end
-    vers = @page.versions
-    idx = vers.find_index { |ver| ver.id == @sha }
-    if idx
-      @pred = vers[idx + 1]&.id
-      @succ = idx.positive? ? vers[idx - 1].id : nil
-      @updated_at = vers[idx].authored_date
-    else
-      @sha = nil
-      @pred = nil
-      @succ = nil
-      @updated_at = nil
-    end
-    @sha
-  end
-
-  def sha
-    @sha
-  end
-
-  def pred
-    @pred
-  end
-
-  def succ
-    @succ
-  end
-
-  def updated_at
-    @updated_at
+  def current_revision
+    wiki_revisions.order(id: :desc).first
   end
 
   def body
-    sha = nil unless @page
-    @page&.raw_data&.force_encoding('UTF-8')
+    rev = current_revision
+    rev.body if rev&.content?
   end
 
-  def set_body content, user:
-    commit_info = { name:   user.id.to_s,
-                    email:  'dummy@example.com' }
-    page = wiki.page("#{ id }.md")
-    if page
-      commit_info[:message] = "Updated #{ id }"
-      wiki.update_page(page, id.to_s, :markdown, content, commit_info)
-    else
-      commit_info[:message] = "Created #{ id }"
-      wiki.write_page(id.to_s, :markdown, content, commit_info)
+  def resolve_redirect limit: 10
+    page = self
+    visited = Set.new
+
+    limit.times do
+      return page if visited.include?(page.id)
+
+      visited.add(page.id)
+
+      rev = page.current_revision
+      return page if !(rev&.redirect?) || !(rev.redirect_page)
+
+      page = rev.redirect_page
     end
+
+    page
   end
 
-  private
+  def pred_revision_id revision_id
+    wiki_revisions.where('id < ?', revision_id).order(id: :desc).limit(1).pick(:id)
+  end
 
-  WIKI_PATH = Rails.root.join('wiki').to_s
-
-  def wiki
-    @wiki ||= Gollum::Wiki.new(WIKI_PATH)
+  def succ_revision_id revision_id
+    wiki_revisions.where('id > ?', revision_id).order(id: :asc).limit(1).pick(:id)
   end
 end