Add CONTAINS edges from Repositories to Issues/PRs (#253)

Also updates the GitHub porcelain.
Existing observable behavior is unchanged, except that performance may
be improved for issueOrPrByNumber.

A bug that would afflict a multi-repository graph (namely, that calling
`repo.issues()` would get all issues for all repositories) is
pre-emptively removed. No test cases were added as we do not yet support
multi-repository graphs.

Test plan: existing unit test coverage is sufficient.

src/plugins/github/__snapshots__/parser.test.js.snap

@@ -16,6 +16,19 @@ Object {
         "type": "ISSUE",
       },
     },
+    "{\\"id\\":\\"[{\\\\\\"id\\\\\\":\\\\\\"https://github.com/sourcecred/example-github\\\\\\",\\\\\\"pluginName\\\\\\":\\\\\\"sourcecred/github-beta\\\\\\",\\\\\\"type\\\\\\":\\\\\\"REPOSITORY\\\\\\"},{\\\\\\"id\\\\\\":\\\\\\"https://github.com/sourcecred/example-github/issues/1\\\\\\",\\\\\\"pluginName\\\\\\":\\\\\\"sourcecred/github-beta\\\\\\",\\\\\\"type\\\\\\":\\\\\\"ISSUE\\\\\\"}]\\",\\"pluginName\\":\\"sourcecred/github-beta\\",\\"type\\":\\"CONTAINS\\"}": Object {
+      "dst": Object {
+        "id": "https://github.com/sourcecred/example-github/issues/1",
+        "pluginName": "sourcecred/github-beta",
+        "type": "ISSUE",
+      },
+      "payload": Object {},
+      "src": Object {
+        "id": "https://github.com/sourcecred/example-github",
+        "pluginName": "sourcecred/github-beta",
+        "type": "REPOSITORY",
+      },
+    },
   },
   "nodes": Object {
     "{\\"id\\":\\"https://github.com/decentralion\\",\\"pluginName\\":\\"sourcecred/github-beta\\",\\"type\\":\\"AUTHOR\\"}": Object {
@@ -138,6 +151,19 @@ Object {
         "type": "ISSUE",
       },
     },
+    "{\\"id\\":\\"[{\\\\\\"id\\\\\\":\\\\\\"https://github.com/sourcecred/example-github\\\\\\",\\\\\\"pluginName\\\\\\":\\\\\\"sourcecred/github-beta\\\\\\",\\\\\\"type\\\\\\":\\\\\\"REPOSITORY\\\\\\"},{\\\\\\"id\\\\\\":\\\\\\"https://github.com/sourcecred/example-github/issues/6\\\\\\",\\\\\\"pluginName\\\\\\":\\\\\\"sourcecred/github-beta\\\\\\",\\\\\\"type\\\\\\":\\\\\\"ISSUE\\\\\\"}]\\",\\"pluginName\\":\\"sourcecred/github-beta\\",\\"type\\":\\"CONTAINS\\"}": Object {
+      "dst": Object {
+        "id": "https://github.com/sourcecred/example-github/issues/6",
+        "pluginName": "sourcecred/github-beta",
+        "type": "ISSUE",
+      },
+      "payload": Object {},
+      "src": Object {
+        "id": "https://github.com/sourcecred/example-github",
+        "pluginName": "sourcecred/github-beta",
+        "type": "REPOSITORY",
+      },
+    },
   },
   "nodes": Object {
     "{\\"id\\":\\"https://github.com/decentralion\\",\\"pluginName\\":\\"sourcecred/github-beta\\",\\"type\\":\\"AUTHOR\\"}": Object {
@@ -267,6 +293,19 @@ Object {
         "type": "PULL_REQUEST",
       },
     },
+    "{\\"id\\":\\"[{\\\\\\"id\\\\\\":\\\\\\"https://github.com/sourcecred/example-github\\\\\\",\\\\\\"pluginName\\\\\\":\\\\\\"sourcecred/github-beta\\\\\\",\\\\\\"type\\\\\\":\\\\\\"REPOSITORY\\\\\\"},{\\\\\\"id\\\\\\":\\\\\\"https://github.com/sourcecred/example-github/pull/5\\\\\\",\\\\\\"pluginName\\\\\\":\\\\\\"sourcecred/github-beta\\\\\\",\\\\\\"type\\\\\\":\\\\\\"PULL_REQUEST\\\\\\"}]\\",\\"pluginName\\":\\"sourcecred/github-beta\\",\\"type\\":\\"CONTAINS\\"}": Object {
+      "dst": Object {
+        "id": "https://github.com/sourcecred/example-github/pull/5",
+        "pluginName": "sourcecred/github-beta",
+        "type": "PULL_REQUEST",
+      },
+      "payload": Object {},
+      "src": Object {
+        "id": "https://github.com/sourcecred/example-github",
+        "pluginName": "sourcecred/github-beta",
+        "type": "REPOSITORY",
+      },
+    },
     "{\\"id\\":\\"[{\\\\\\"id\\\\\\":\\\\\\"https://github.com/wchargin\\\\\\",\\\\\\"pluginName\\\\\\":\\\\\\"sourcecred/github-beta\\\\\\",\\\\\\"type\\\\\\":\\\\\\"AUTHOR\\\\\\"},{\\\\\\"id\\\\\\":\\\\\\"https://github.com/sourcecred/example-github/pull/5#discussion_r171460198\\\\\\",\\\\\\"pluginName\\\\\\":\\\\\\"sourcecred/github-beta\\\\\\",\\\\\\"type\\\\\\":\\\\\\"PULL_REQUEST_REVIEW_COMMENT\\\\\\"}]\\",\\"pluginName\\":\\"sourcecred/github-beta\\",\\"type\\":\\"AUTHORS\\"}": Object {
       "dst": Object {
         "id": "https://github.com/wchargin",
@@ -422,6 +461,19 @@ Object {
         "type": "PULL_REQUEST",
       },
     },
+    "{\\"id\\":\\"[{\\\\\\"id\\\\\\":\\\\\\"https://github.com/sourcecred/example-github\\\\\\",\\\\\\"pluginName\\\\\\":\\\\\\"sourcecred/github-beta\\\\\\",\\\\\\"type\\\\\\":\\\\\\"REPOSITORY\\\\\\"},{\\\\\\"id\\\\\\":\\\\\\"https://github.com/sourcecred/example-github/pull/3\\\\\\",\\\\\\"pluginName\\\\\\":\\\\\\"sourcecred/github-beta\\\\\\",\\\\\\"type\\\\\\":\\\\\\"PULL_REQUEST\\\\\\"}]\\",\\"pluginName\\":\\"sourcecred/github-beta\\",\\"type\\":\\"CONTAINS\\"}": Object {
+      "dst": Object {
+        "id": "https://github.com/sourcecred/example-github/pull/3",
+        "pluginName": "sourcecred/github-beta",
+        "type": "PULL_REQUEST",
+      },
+      "payload": Object {},
+      "src": Object {
+        "id": "https://github.com/sourcecred/example-github",
+        "pluginName": "sourcecred/github-beta",
+        "type": "REPOSITORY",
+      },
+    },
   },
   "nodes": Object {
     "{\\"id\\":\\"https://github.com/decentralion\\",\\"pluginName\\":\\"sourcecred/github-beta\\",\\"type\\":\\"AUTHOR\\"}": Object {
@@ -862,6 +914,45 @@ Object {
         "type": "ISSUE",
       },
     },
+    "{\\"id\\":\\"[{\\\\\\"id\\\\\\":\\\\\\"https://github.com/sourcecred/example-github\\\\\\",\\\\\\"pluginName\\\\\\":\\\\\\"sourcecred/github-beta\\\\\\",\\\\\\"type\\\\\\":\\\\\\"REPOSITORY\\\\\\"},{\\\\\\"id\\\\\\":\\\\\\"https://github.com/sourcecred/example-github/issues/1\\\\\\",\\\\\\"pluginName\\\\\\":\\\\\\"sourcecred/github-beta\\\\\\",\\\\\\"type\\\\\\":\\\\\\"ISSUE\\\\\\"}]\\",\\"pluginName\\":\\"sourcecred/github-beta\\",\\"type\\":\\"CONTAINS\\"}": Object {
+      "dst": Object {
+        "id": "https://github.com/sourcecred/example-github/issues/1",
+        "pluginName": "sourcecred/github-beta",
+        "type": "ISSUE",
+      },
+      "payload": Object {},
+      "src": Object {
+        "id": "https://github.com/sourcecred/example-github",
+        "pluginName": "sourcecred/github-beta",
+        "type": "REPOSITORY",
+      },
+    },
+    "{\\"id\\":\\"[{\\\\\\"id\\\\\\":\\\\\\"https://github.com/sourcecred/example-github\\\\\\",\\\\\\"pluginName\\\\\\":\\\\\\"sourcecred/github-beta\\\\\\",\\\\\\"type\\\\\\":\\\\\\"REPOSITORY\\\\\\"},{\\\\\\"id\\\\\\":\\\\\\"https://github.com/sourcecred/example-github/issues/2\\\\\\",\\\\\\"pluginName\\\\\\":\\\\\\"sourcecred/github-beta\\\\\\",\\\\\\"type\\\\\\":\\\\\\"ISSUE\\\\\\"}]\\",\\"pluginName\\":\\"sourcecred/github-beta\\",\\"type\\":\\"CONTAINS\\"}": Object {
+      "dst": Object {
+        "id": "https://github.com/sourcecred/example-github/issues/2",
+        "pluginName": "sourcecred/github-beta",
+        "type": "ISSUE",
+      },
+      "payload": Object {},
+      "src": Object {
+        "id": "https://github.com/sourcecred/example-github",
+        "pluginName": "sourcecred/github-beta",
+        "type": "REPOSITORY",
+      },
+    },
+    "{\\"id\\":\\"[{\\\\\\"id\\\\\\":\\\\\\"https://github.com/sourcecred/example-github\\\\\\",\\\\\\"pluginName\\\\\\":\\\\\\"sourcecred/github-beta\\\\\\",\\\\\\"type\\\\\\":\\\\\\"REPOSITORY\\\\\\"},{\\\\\\"id\\\\\\":\\\\\\"https://github.com/sourcecred/example-github/issues/6\\\\\\",\\\\\\"pluginName\\\\\\":\\\\\\"sourcecred/github-beta\\\\\\",\\\\\\"type\\\\\\":\\\\\\"ISSUE\\\\\\"}]\\",\\"pluginName\\":\\"sourcecred/github-beta\\",\\"type\\":\\"CONTAINS\\"}": Object {
+      "dst": Object {
+        "id": "https://github.com/sourcecred/example-github/issues/6",
+        "pluginName": "sourcecred/github-beta",
+        "type": "ISSUE",
+      },
+      "payload": Object {},
+      "src": Object {
+        "id": "https://github.com/sourcecred/example-github",
+        "pluginName": "sourcecred/github-beta",
+        "type": "REPOSITORY",
+      },
+    },
   },
   "nodes": Object {
     "{\\"id\\":\\"https://github.com/decentralion\\",\\"pluginName\\":\\"sourcecred/github-beta\\",\\"type\\":\\"AUTHOR\\"}": Object {
@@ -1217,6 +1308,19 @@ Object {
         "type": "ISSUE",
       },
     },
+    "{\\"id\\":\\"[{\\\\\\"id\\\\\\":\\\\\\"https://github.com/sourcecred/example-github\\\\\\",\\\\\\"pluginName\\\\\\":\\\\\\"sourcecred/github-beta\\\\\\",\\\\\\"type\\\\\\":\\\\\\"REPOSITORY\\\\\\"},{\\\\\\"id\\\\\\":\\\\\\"https://github.com/sourcecred/example-github/issues/2\\\\\\",\\\\\\"pluginName\\\\\\":\\\\\\"sourcecred/github-beta\\\\\\",\\\\\\"type\\\\\\":\\\\\\"ISSUE\\\\\\"}]\\",\\"pluginName\\":\\"sourcecred/github-beta\\",\\"type\\":\\"CONTAINS\\"}": Object {
+      "dst": Object {
+        "id": "https://github.com/sourcecred/example-github/issues/2",
+        "pluginName": "sourcecred/github-beta",
+        "type": "ISSUE",
+      },
+      "payload": Object {},
+      "src": Object {
+        "id": "https://github.com/sourcecred/example-github",
+        "pluginName": "sourcecred/github-beta",
+        "type": "REPOSITORY",
+      },
+    },
   },
   "nodes": Object {
     "{\\"id\\":\\"https://github.com/decentralion\\",\\"pluginName\\":\\"sourcecred/github-beta\\",\\"type\\":\\"AUTHOR\\"}": Object {
@@ -2010,6 +2114,123 @@ Object {
         "type": "PULL_REQUEST",
       },
     },
+    "{\\"id\\":\\"[{\\\\\\"id\\\\\\":\\\\\\"https://github.com/sourcecred/example-github\\\\\\",\\\\\\"pluginName\\\\\\":\\\\\\"sourcecred/github-beta\\\\\\",\\\\\\"type\\\\\\":\\\\\\"REPOSITORY\\\\\\"},{\\\\\\"id\\\\\\":\\\\\\"https://github.com/sourcecred/example-github/issues/1\\\\\\",\\\\\\"pluginName\\\\\\":\\\\\\"sourcecred/github-beta\\\\\\",\\\\\\"type\\\\\\":\\\\\\"ISSUE\\\\\\"}]\\",\\"pluginName\\":\\"sourcecred/github-beta\\",\\"type\\":\\"CONTAINS\\"}": Object {
+      "dst": Object {
+        "id": "https://github.com/sourcecred/example-github/issues/1",
+        "pluginName": "sourcecred/github-beta",
+        "type": "ISSUE",
+      },
+      "payload": Object {},
+      "src": Object {
+        "id": "https://github.com/sourcecred/example-github",
+        "pluginName": "sourcecred/github-beta",
+        "type": "REPOSITORY",
+      },
+    },
+    "{\\"id\\":\\"[{\\\\\\"id\\\\\\":\\\\\\"https://github.com/sourcecred/example-github\\\\\\",\\\\\\"pluginName\\\\\\":\\\\\\"sourcecred/github-beta\\\\\\",\\\\\\"type\\\\\\":\\\\\\"REPOSITORY\\\\\\"},{\\\\\\"id\\\\\\":\\\\\\"https://github.com/sourcecred/example-github/issues/2\\\\\\",\\\\\\"pluginName\\\\\\":\\\\\\"sourcecred/github-beta\\\\\\",\\\\\\"type\\\\\\":\\\\\\"ISSUE\\\\\\"}]\\",\\"pluginName\\":\\"sourcecred/github-beta\\",\\"type\\":\\"CONTAINS\\"}": Object {
+      "dst": Object {
+        "id": "https://github.com/sourcecred/example-github/issues/2",
+        "pluginName": "sourcecred/github-beta",
+        "type": "ISSUE",
+      },
+      "payload": Object {},
+      "src": Object {
+        "id": "https://github.com/sourcecred/example-github",
+        "pluginName": "sourcecred/github-beta",
+        "type": "REPOSITORY",
+      },
+    },
+    "{\\"id\\":\\"[{\\\\\\"id\\\\\\":\\\\\\"https://github.com/sourcecred/example-github\\\\\\",\\\\\\"pluginName\\\\\\":\\\\\\"sourcecred/github-beta\\\\\\",\\\\\\"type\\\\\\":\\\\\\"REPOSITORY\\\\\\"},{\\\\\\"id\\\\\\":\\\\\\"https://github.com/sourcecred/example-github/issues/4\\\\\\",\\\\\\"pluginName\\\\\\":\\\\\\"sourcecred/github-beta\\\\\\",\\\\\\"type\\\\\\":\\\\\\"ISSUE\\\\\\"}]\\",\\"pluginName\\":\\"sourcecred/github-beta\\",\\"type\\":\\"CONTAINS\\"}": Object {
+      "dst": Object {
+        "id": "https://github.com/sourcecred/example-github/issues/4",
+        "pluginName": "sourcecred/github-beta",
+        "type": "ISSUE",
+      },
+      "payload": Object {},
+      "src": Object {
+        "id": "https://github.com/sourcecred/example-github",
+        "pluginName": "sourcecred/github-beta",
+        "type": "REPOSITORY",
+      },
+    },
+    "{\\"id\\":\\"[{\\\\\\"id\\\\\\":\\\\\\"https://github.com/sourcecred/example-github\\\\\\",\\\\\\"pluginName\\\\\\":\\\\\\"sourcecred/github-beta\\\\\\",\\\\\\"type\\\\\\":\\\\\\"REPOSITORY\\\\\\"},{\\\\\\"id\\\\\\":\\\\\\"https://github.com/sourcecred/example-github/issues/6\\\\\\",\\\\\\"pluginName\\\\\\":\\\\\\"sourcecred/github-beta\\\\\\",\\\\\\"type\\\\\\":\\\\\\"ISSUE\\\\\\"}]\\",\\"pluginName\\":\\"sourcecred/github-beta\\",\\"type\\":\\"CONTAINS\\"}": Object {
+      "dst": Object {
+        "id": "https://github.com/sourcecred/example-github/issues/6",
+        "pluginName": "sourcecred/github-beta",
+        "type": "ISSUE",
+      },
+      "payload": Object {},
+      "src": Object {
+        "id": "https://github.com/sourcecred/example-github",
+        "pluginName": "sourcecred/github-beta",
+        "type": "REPOSITORY",
+      },
+    },
+    "{\\"id\\":\\"[{\\\\\\"id\\\\\\":\\\\\\"https://github.com/sourcecred/example-github\\\\\\",\\\\\\"pluginName\\\\\\":\\\\\\"sourcecred/github-beta\\\\\\",\\\\\\"type\\\\\\":\\\\\\"REPOSITORY\\\\\\"},{\\\\\\"id\\\\\\":\\\\\\"https://github.com/sourcecred/example-github/issues/7\\\\\\",\\\\\\"pluginName\\\\\\":\\\\\\"sourcecred/github-beta\\\\\\",\\\\\\"type\\\\\\":\\\\\\"ISSUE\\\\\\"}]\\",\\"pluginName\\":\\"sourcecred/github-beta\\",\\"type\\":\\"CONTAINS\\"}": Object {
+      "dst": Object {
+        "id": "https://github.com/sourcecred/example-github/issues/7",
+        "pluginName": "sourcecred/github-beta",
+        "type": "ISSUE",
+      },
+      "payload": Object {},
+      "src": Object {
+        "id": "https://github.com/sourcecred/example-github",
+        "pluginName": "sourcecred/github-beta",
+        "type": "REPOSITORY",
+      },
+    },
+    "{\\"id\\":\\"[{\\\\\\"id\\\\\\":\\\\\\"https://github.com/sourcecred/example-github\\\\\\",\\\\\\"pluginName\\\\\\":\\\\\\"sourcecred/github-beta\\\\\\",\\\\\\"type\\\\\\":\\\\\\"REPOSITORY\\\\\\"},{\\\\\\"id\\\\\\":\\\\\\"https://github.com/sourcecred/example-github/issues/8\\\\\\",\\\\\\"pluginName\\\\\\":\\\\\\"sourcecred/github-beta\\\\\\",\\\\\\"type\\\\\\":\\\\\\"ISSUE\\\\\\"}]\\",\\"pluginName\\":\\"sourcecred/github-beta\\",\\"type\\":\\"CONTAINS\\"}": Object {
+      "dst": Object {
+        "id": "https://github.com/sourcecred/example-github/issues/8",
+        "pluginName": "sourcecred/github-beta",
+        "type": "ISSUE",
+      },
+      "payload": Object {},
+      "src": Object {
+        "id": "https://github.com/sourcecred/example-github",
+        "pluginName": "sourcecred/github-beta",
+        "type": "REPOSITORY",
+      },
+    },
+    "{\\"id\\":\\"[{\\\\\\"id\\\\\\":\\\\\\"https://github.com/sourcecred/example-github\\\\\\",\\\\\\"pluginName\\\\\\":\\\\\\"sourcecred/github-beta\\\\\\",\\\\\\"type\\\\\\":\\\\\\"REPOSITORY\\\\\\"},{\\\\\\"id\\\\\\":\\\\\\"https://github.com/sourcecred/example-github/pull/3\\\\\\",\\\\\\"pluginName\\\\\\":\\\\\\"sourcecred/github-beta\\\\\\",\\\\\\"type\\\\\\":\\\\\\"PULL_REQUEST\\\\\\"}]\\",\\"pluginName\\":\\"sourcecred/github-beta\\",\\"type\\":\\"CONTAINS\\"}": Object {
+      "dst": Object {
+        "id": "https://github.com/sourcecred/example-github/pull/3",
+        "pluginName": "sourcecred/github-beta",
+        "type": "PULL_REQUEST",
+      },
+      "payload": Object {},
+      "src": Object {
+        "id": "https://github.com/sourcecred/example-github",
+        "pluginName": "sourcecred/github-beta",
+        "type": "REPOSITORY",
+      },
+    },
+    "{\\"id\\":\\"[{\\\\\\"id\\\\\\":\\\\\\"https://github.com/sourcecred/example-github\\\\\\",\\\\\\"pluginName\\\\\\":\\\\\\"sourcecred/github-beta\\\\\\",\\\\\\"type\\\\\\":\\\\\\"REPOSITORY\\\\\\"},{\\\\\\"id\\\\\\":\\\\\\"https://github.com/sourcecred/example-github/pull/5\\\\\\",\\\\\\"pluginName\\\\\\":\\\\\\"sourcecred/github-beta\\\\\\",\\\\\\"type\\\\\\":\\\\\\"PULL_REQUEST\\\\\\"}]\\",\\"pluginName\\":\\"sourcecred/github-beta\\",\\"type\\":\\"CONTAINS\\"}": Object {
+      "dst": Object {
+        "id": "https://github.com/sourcecred/example-github/pull/5",
+        "pluginName": "sourcecred/github-beta",
+        "type": "PULL_REQUEST",
+      },
+      "payload": Object {},
+      "src": Object {
+        "id": "https://github.com/sourcecred/example-github",
+        "pluginName": "sourcecred/github-beta",
+        "type": "REPOSITORY",
+      },
+    },
+    "{\\"id\\":\\"[{\\\\\\"id\\\\\\":\\\\\\"https://github.com/sourcecred/example-github\\\\\\",\\\\\\"pluginName\\\\\\":\\\\\\"sourcecred/github-beta\\\\\\",\\\\\\"type\\\\\\":\\\\\\"REPOSITORY\\\\\\"},{\\\\\\"id\\\\\\":\\\\\\"https://github.com/sourcecred/example-github/pull/9\\\\\\",\\\\\\"pluginName\\\\\\":\\\\\\"sourcecred/github-beta\\\\\\",\\\\\\"type\\\\\\":\\\\\\"PULL_REQUEST\\\\\\"}]\\",\\"pluginName\\":\\"sourcecred/github-beta\\",\\"type\\":\\"CONTAINS\\"}": Object {
+      "dst": Object {
+        "id": "https://github.com/sourcecred/example-github/pull/9",
+        "pluginName": "sourcecred/github-beta",
+        "type": "PULL_REQUEST",
+      },
+      "payload": Object {},
+      "src": Object {
+        "id": "https://github.com/sourcecred/example-github",
+        "pluginName": "sourcecred/github-beta",
+        "type": "REPOSITORY",
+      },
+    },
     "{\\"id\\":\\"[{\\\\\\"id\\\\\\":\\\\\\"https://github.com/wchargin\\\\\\",\\\\\\"pluginName\\\\\\":\\\\\\"sourcecred/github-beta\\\\\\",\\\\\\"type\\\\\\":\\\\\\"AUTHOR\\\\\\"},{\\\\\\"id\\\\\\":\\\\\\"https://github.com/sourcecred/example-github/pull/5#discussion_r171460198\\\\\\",\\\\\\"pluginName\\\\\\":\\\\\\"sourcecred/github-beta\\\\\\",\\\\\\"type\\\\\\":\\\\\\"PULL_REQUEST_REVIEW_COMMENT\\\\\\"}]\\",\\"pluginName\\":\\"sourcecred/github-beta\\",\\"type\\":\\"AUTHORS\\"}": Object {
       "dst": Object {
         "id": "https://github.com/wchargin",

src/plugins/github/parser.js

@@ -166,9 +166,14 @@ class GithubParser {
 
   addContainment(
     parentNode: Node<
-      IssueNodePayload | PullRequestNodePayload | PullRequestReviewNodePayload
+      | IssueNodePayload
+      | PullRequestNodePayload
+      | PullRequestReviewNodePayload
+      | RepositoryNodePayload
     >,
     childNode: Node<
+      | IssueNodePayload
+      | PullRequestNodePayload
       | CommentNodePayload
       | PullRequestReviewCommentNodePayload
       | PullRequestReviewNodePayload
@@ -187,7 +192,7 @@ class GithubParser {
     this.graph.addEdge(containsEdge);
   }
 
-  addIssue(issueJson: IssueJSON) {
+  addIssue(repoNode: Node<RepositoryNodePayload>, issueJson: IssueJSON) {
     const issuePayload: IssueNodePayload = {
       url: issueJson.url,
       number: issueJson.number,
@@ -201,11 +206,15 @@ class GithubParser {
     this.graph.addNode(issueNode);
 
     this.addAuthorship(issueNode, issueJson.author);
+    this.addContainment(repoNode, issueNode);
 
     issueJson.comments.nodes.forEach((c) => this.addComment(issueNode, c));
   }
 
-  addPullRequest(prJson: PullRequestJSON) {
+  addPullRequest(
+    repoNode: Node<RepositoryNodePayload>,
+    prJson: PullRequestJSON
+  ) {
     const pullRequestPayload: PullRequestNodePayload = {
       url: prJson.url,
       number: prJson.number,
@@ -219,6 +228,7 @@ class GithubParser {
     this.graph.addNode(pullRequestNode);
 
     this.addAuthorship(pullRequestNode, prJson.author);
+    this.addContainment(repoNode, pullRequestNode);
     prJson.comments.nodes.forEach((c) => this.addComment(pullRequestNode, c));
 
     prJson.reviews.nodes.forEach((r) =>
@@ -338,8 +348,12 @@ class GithubParser {
       payload: repositoryPayload,
     };
     this.graph.addNode(repositoryNode);
-    repositoryJSON.issues.nodes.forEach((i) => this.addIssue(i));
-    repositoryJSON.pullRequests.nodes.forEach((pr) => this.addPullRequest(pr));
+    repositoryJSON.issues.nodes.forEach((issue) =>
+      this.addIssue(repositoryNode, issue)
+    );
+    repositoryJSON.pullRequests.nodes.forEach((pr) =>
+      this.addPullRequest(repositoryNode, pr)
+    );
   }
 
   addData(dataJson: GithubResponseJSON) {

src/plugins/github/porcelain.js

@@ -172,22 +172,19 @@ export class Repository extends GithubEntity<RepositoryNodePayload> {
     assertEntityType(e, REPOSITORY_NODE_TYPE);
     return (e: any);
   }
-  // TODO: Now that the Repository is a node in the graph, re-write methods
-  // that find issues and PRs to find neighbors of the repository rather than
-  // any matching nodes in the graph. Then, behavior will be correct in the
-  // case where we have multiple repositories in the same graph.
+
   issueOrPRByNumber(number: number): ?(Issue | PullRequest) {
     let result: Issue | PullRequest;
-    this.graph.nodes({type: ISSUE_NODE_TYPE}).forEach((n) => {
-      if (n.payload.number === number) {
-        result = new Issue(this.graph, n.address);
-      }
-    });
-    this.graph.nodes({type: PULL_REQUEST_NODE_TYPE}).forEach((n) => {
-      if (n.payload.number === number) {
-        result = new PullRequest(this.graph, n.address);
-      }
-    });
+    this.graph
+      .neighborhood(this.nodeAddress, {
+        edgeType: CONTAINS_EDGE_TYPE,
+      })
+      .forEach(({neighbor}) => {
+        const payload = this.graph.node(neighbor).payload;
+        if (payload.number === number) {
+          result = (asEntity(this.graph, neighbor): any);
+        }
+      });
     return result;
   }
 
@@ -201,14 +198,22 @@ export class Repository extends GithubEntity<RepositoryNodePayload> {
 
   issues(): Issue[] {
     return this.graph
-      .nodes({type: ISSUE_NODE_TYPE})
-      .map((n) => new Issue(this.graph, n.address));
+      .neighborhood(this.nodeAddress, {
+        direction: "OUT",
+        edgeType: CONTAINS_EDGE_TYPE,
+        nodeType: ISSUE_NODE_TYPE,
+      })
+      .map(({neighbor}) => new Issue(this.graph, neighbor));
   }
 
   pullRequests(): PullRequest[] {
     return this.graph
-      .nodes({type: PULL_REQUEST_NODE_TYPE})
-      .map((n) => new PullRequest(this.graph, n.address));
+      .neighborhood(this.nodeAddress, {
+        direction: "OUT",
+        edgeType: CONTAINS_EDGE_TYPE,
+        nodeType: PULL_REQUEST_NODE_TYPE,
+      })
+      .map(({neighbor}) => new PullRequest(this.graph, neighbor));
   }
 }