Use specific has_many relation

Adds has_many relation to get blocking issues.

ee/app/controllers/ee/boards/issues_controller.rb

@@ -7,7 +7,7 @@ module EE
 
       override :associations_to_preload
       def associations_to_preload
-        super << { target_issue_links: { source: { project: :project_feature } } }
+        super << { blocked_by_issues: { project: :project_feature } }
       end
     end
   end

ee/app/models/ee/issue.rb

@@ -42,7 +42,8 @@ module EE
       has_many :vulnerability_links, class_name: 'Vulnerabilities::IssueLink', inverse_of: :issue
       has_many :related_vulnerabilities, through: :vulnerability_links, source: :vulnerability
 
-      has_many :target_issue_links, class_name: 'IssueLink', foreign_key: :target_id
+      has_many :blocked_by_issue_links, -> { where(link_type: IssueLink::TYPE_BLOCKS) }, class_name: 'IssueLink', foreign_key: :target_id
+      has_many :blocked_by_issues, through: :blocked_by_issue_links, source: :source
 
       validates :weight, allow_nil: true, numericality: { greater_than_or_equal_to: 0 }
 

ee/app/serializers/ee/issue_board_entity.rb

@@ -7,7 +7,7 @@ module EE
     prepended do
       expose :weight, if: ->(issue, _) { issue.supports_weight? }
       expose :blocked do |issue|
-        issue.target_issue_links.any? { |link| link.link_type == IssueLink::TYPE_BLOCKS && can?(request.current_user, :read_issue, link.source) }
+        issue.blocked_by_issues.any? { |blocked_by_issue| can?(request.current_user, :read_issue, blocked_by_issue) }
       end
     end
   end

ee/spec/models/issue_spec.rb

@@ -127,6 +127,8 @@ describe Issue do
     it { is_expected.to have_many(:related_vulnerabilities).through(:vulnerability_links).source(:vulnerability) }
     it { is_expected.to belong_to(:promoted_to_epic).class_name('Epic') }
     it { is_expected.to have_many(:resource_weight_events) }
+    it { is_expected.to have_many(:blocked_by_issue_links) }
+    it { is_expected.to have_many(:blocked_by_issues).through(:blocked_by_issue_links).source(:source) }
 
     describe 'versions.most_recent' do
       it 'returns the most recent version' do

spec/lib/gitlab/import_export/all_models.yml

@@ -38,7 +38,8 @@ issues:
 - vulnerability_links
 - related_vulnerabilities
 - user_mentions
-- target_issue_links
+- blocked_by_issue_links
+- blocked_by_issues
 events:
 - author
 - project