FIX [api] get pull bug

(cherry picked from commit fa01194d3c)

app/controllers/compare_controller.rb

@@ -6,10 +6,26 @@ class CompareController < ApplicationController
   end
 
   def show
+    compare
+  end
+
+  private
+  def compare
+    base, head = compare_params
+
+    # TODO: 处理fork的项目向源项目发送PR的base、head参数问题
+    @compare_result ||=
+      head.include?(":") ? gitea_compare(base, head) : gitea_compare(head, base)
+  end
+
+  def compare_params
     base = Addressable::URI.unescape(params[:base])
     head = params[:head].include?('json') ? params[:head]&.split('.json')[0] : params[:head]
-    @compare_result = Gitea::Repository::Commits::CompareService.call(@owner.login, @project.identifier, head, base)
 
-    # render json: @compare_result
+    [base, head]
+  end
+
+  def gitea_compare(base, head)
+    Gitea::Repository::Commits::CompareService.call(@owner.login, @project.identifier, base, head)
   end
 end

app/views/pull_requests/show.json.jbuilder

@@ -1,5 +1,6 @@
 json.partial! "commons/success"
 json.project_name @project.name
+json.identifier @project.identifier
 json.pr_time time_from_now(@pull_request.updated_at)
 json.commits_count @pull_request.commits_count
 json.files_count @pull_request.files_count