If merge request wasn't persisted yet, we show only 1 pipeline:

However, if MergeRequest#all_commits_sha would want to handle non-persisted merge request, by judging its name, it should not just give 1 SHA, but all of them. But we don't really care all_commits_sha for non-persisted merge request anyway. So I think we should just ignore that case. Better to not implementing something than implementing it in a wrong and confusing way.

If merge request wasn't persisted yet, we show only 1 pipeline:
3ae99b2c · Lin Jen-Shin · 55de6e15 · 3ae99b2c
Commit 3ae99b2c authored Sep 20, 2016 by Lin Jen-Shin
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Showing with 11 additions and 7 deletions

merge_request.rb app/models/merge_request.rb +11 -7

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--- a/app/models/merge_request.rb
+++ b/app/models/merge_request.rb
@@ -747,17 +747,21 @@ class MergeRequest < ActiveRecord::Base
  def all_pipelines
    return unless source_project

-    @all_pipelines ||= source_project.pipelines.order(id: :desc).
-      where(sha: all_commits_sha, ref: source_branch)
+    @all_pipelines ||= begin
+      sha = if persisted?
+              all_commits_sha
+            else
+              diff_head_sha
+            end
+
+      source_project.pipelines.order(id: :desc).
+        where(sha: sha, ref: source_branch)
+    end
  end

  # Note that this could also return SHA from now dangling commits
  def all_commits_sha
-    if persisted?
-      merge_request_diffs.flat_map(&:commits_sha).uniq
-    else
-      [diff_head_sha]
-    end
+    merge_request_diffs.flat_map(&:commits_sha).uniq
  end

  def merge_commit