X-Git-Url: http://nitlanguage.org

diff --git a/lib/github/api.nit b/lib/github/api.nit
index dc4e586..59917c5 100644
--- a/lib/github/api.nit
+++ b/lib/github/api.nit
@@ -351,7 +351,10 @@ abstract class GithubEntity
 	redef fun to_s do return json.to_json
 
 	# Github page url.
-	fun html_url: String do return json["html_url"].to_s
+	fun html_url: String do return json["html_url"].as(String)
+
+	# Set page url.
+	fun html_url=(url: String) do json["html_url"] = url
 end
 
 # A Github user
@@ -368,12 +371,15 @@ class User
 
 	# Init `self` from a `json` object.
 	init from_json(api: GithubAPI, json: JsonObject) do
-		init(api, json["login"].to_s)
+		init(api, json["login"].as(String))
 		self.json = json
 	end
 
 	# Avatar image url for this user.
-	fun avatar_url: String do return json["avatar_url"].to_s
+	fun avatar_url: String do return json["avatar_url"].as(String)
+
+	# Set avatar url.
+	fun avatar_url=(url: String) do json["avatar_url"] = url
 end
 
 # A Github repository.
@@ -390,17 +396,21 @@ class Repo
 
 	# Init `self` from a `json` object.
 	init from_json(api: GithubAPI, json: JsonObject) do
-		init(api, json["full_name"].to_s)
+		init(api, json["full_name"].as(String))
 		self.json = json
 	end
 
 	# Repo short name on Github.
-	fun name: String do return json["name"].to_s
+	fun name: String do return json["name"].as(String)
+
+	# Set repo full name
+	fun name=(name: String) do json["name"] = name
 
 	# Get the repo owner.
-	fun owner: User do
-		return new User.from_json(api, json["owner"].as(JsonObject))
-	end
+	fun owner: User do return new User.from_json(api, json["owner"].as(JsonObject))
+
+	# Set repo owner
+	fun owner=(owner: User) do json["owner"] = owner.json
 
 	# List of branches associated with their names.
 	fun branches: Map[String, Branch] do
@@ -410,7 +420,7 @@ class Repo
 		if not array isa JsonArray then return res
 		for obj in array do
 			if not obj isa JsonObject then continue
-			var name = obj["name"].to_s
+			var name = obj["name"].as(String)
 			res[name] = new Branch.from_json(api, self, obj)
 		end
 		return res
@@ -470,7 +480,7 @@ class Repo
 		if not array isa JsonArray then return res
 		for obj in array do
 			if not obj isa JsonObject then continue
-			var name = obj["name"].to_s
+			var name = obj["name"].as(String)
 			res[name] = new Label.from_json(api, self, obj)
 		end
 		return res
@@ -528,11 +538,14 @@ class Repo
 
 	# Repo default branch.
 	fun default_branch: Branch do
-		var name = json["default_branch"].to_s
+		var name = json["default_branch"].as(String)
 		var branch = api.load_branch(self, name)
 		assert branch isa Branch
 		return branch
 	end
+
+	# Set the default branch
+	fun default_branch=(branch: Branch) do json["default_branch"] = branch.json
 end
 
 # A `RepoEntity` is something contained in a `Repo`.
@@ -544,8 +557,7 @@ abstract class RepoEntity
 
 	# Init `self` from a `json` object.
 	init from_json(api: GithubAPI, repo: Repo, json: JsonObject) do
-		self.api = api
-		self.repo = repo
+		init(api, repo)
 		self.json = json
 	end
 end
@@ -564,14 +576,15 @@ class Branch
 	var name: String
 
 	redef init from_json(api, repo, json) do
-		self.name = json["name"].to_s
+		self.name = json["name"].as(String)
 		super
 	end
 
 	# Get the last commit of `self`.
-	fun commit: Commit do
-		return new Commit.from_json(api, repo, json["commit"].as(JsonObject))
-	end
+	fun commit: Commit do return new Commit.from_json(api, repo, json["commit"].as(JsonObject))
+
+	# Set the last commit
+	fun commit=(commit: Commit) do json["commit"] = commit.json
 
 	# List all commits in `self`.
 	#
@@ -609,56 +622,79 @@ class Commit
 	var sha: String
 
 	redef init from_json(api, repo, json) do
-		self.sha = json["sha"].to_s
+		self.sha = json["sha"].as(String)
 		super
 	end
 
 	# Parent commits of `self`.
 	fun parents: Array[Commit] do
 		var res = new Array[Commit]
-		var parents = json["parents"]
+		var parents = json.get_or_null("parents")
 		if not parents isa JsonArray then return res
 		for obj in parents do
 			if not obj isa JsonObject then continue
-			res.add(api.load_commit(repo, obj["sha"].to_s).as(not null))
+			res.add(api.load_commit(repo, obj["sha"].as(String)).as(not null))
 		end
 		return res
 	end
 
+	# Set parent commits.
+	fun parents=(parents: Array[Commit]) do
+		var res = new JsonArray
+		for parent in parents do res.add parent.json
+		json["parents"] = res
+	end
+
 	# Author of the commit.
 	fun author: nullable User do
-		if not json.has_key("author") then return null
-		var user = json["author"]
-		if not user isa JsonObject then return null
-		return new User.from_json(api, user)
+		var user = json.get_or_null("author")
+		if user isa JsonObject then return new User.from_json(api, user)
+		return null
+	end
+
+	# Set commit author.
+	fun author=(user: nullable User) do
+		if user == null then
+			json["author"] = null
+		else
+			json["author"] = user.json
+		end
 	end
 
 	# Committer of the commit.
 	fun committer: nullable User do
-		if not json.has_key("committer") then return null
-		var user = json["author"]
-		if not user isa JsonObject then return null
-		return new User.from_json(api, user)
+		var user = json.get_or_null("author")
+		if user isa JsonObject then return new User.from_json(api, user)
+		return null
+	end
+
+	# Set commit committer.
+	fun committer=(user: nullable User) do
+		if user == null then
+			json["committer"] = null
+		else
+			json["committer"] = user.json
+		end
 	end
 
 	# Authoring date as ISODate.
 	fun author_date: ISODate do
 		var commit = json["commit"].as(JsonObject)
 		var author = commit["author"].as(JsonObject)
-		return new ISODate.from_string(author["date"].to_s)
+		return new ISODate.from_string(author["date"].as(String))
 	end
 
 	# Commit date as ISODate.
 	fun commit_date: ISODate do
 		var commit = json["commit"].as(JsonObject)
 		var author = commit["committer"].as(JsonObject)
-		return new ISODate.from_string(author["date"].to_s)
+		return new ISODate.from_string(author["date"].as(String))
 	end
 
 	# List files staged in this commit.
 	fun files: Array[GithubFile] do
 		var res = new Array[GithubFile]
-		var files = json["files"]
+		var files = json.get_or_null("files")
 		if not files isa JsonArray then return res
 		for obj in files do
 			res.add(new GithubFile(obj.as(JsonObject)))
@@ -666,8 +702,15 @@ class Commit
 		return res
 	end
 
+	# Set commit files.
+	fun files=(files: Array[GithubFile]) do
+		var res = new JsonArray
+		for file in files do res.add file.json
+		json["files"] = res
+	end
+
 	# Commit message.
-	fun message: String do return json["commit"].as(JsonObject)["message"].to_s
+	fun message: String do return json["commit"].as(JsonObject)["message"].as(String)
 end
 
 # A Github issue.
@@ -688,44 +731,79 @@ class Issue
 		super
 	end
 
+	# Issue id.
+	fun id: Int do return json["id"].as(Int)
+
+	# Set issue id.
+	fun id=(id: Int) do json["id"] = id
+
 	# Issue title.
-	fun title: String do return json["title"].to_s
+	fun title: String do return json["title"].as(String)
+
+	# Set issue title
+	fun title=(title: String) do json["title"] = title
 
 	# User that created this issue.
-	fun user: User do
-		return new User.from_json(api, json["user"].as(JsonObject))
-	end
+	fun user: User do return new User.from_json(api, json["user"].as(JsonObject))
+
+	# Set issue creator.
+	fun user=(user: User) do json["user"] = user.json
 
 	# List of labels on this issue associated to their names.
 	fun labels: Map[String, Label] do
 		var res = new HashMap[String, Label]
-		if not json.has_key("labels") then return res
-		for obj in json["labels"].as(JsonArray) do
+		var lbls = json.get_or_null("labels")
+		if not lbls isa JsonArray then return res
+		for obj in lbls do
 			if not obj isa JsonObject then continue
-			var name = obj["name"].to_s
+			var name = obj["name"].as(String)
 			res[name] = new Label.from_json(api, repo, obj)
 		end
 		return res
 	end
 
 	# State of the issue on Github.
-	fun state: String do return json["state"].to_s
+	fun state: String do return json["state"].as(String)
+
+	# Set the state of this issue.
+	fun state=(state: String) do json["state"] = state
 
 	# Is the issue locked?
 	fun locked: Bool do return json["locked"].as(Bool)
 
+	# Set issue locked state.
+	fun locked=(locked: Bool) do json["locked"] = locked
+
 	# Assigned `User` (if any).
 	fun assignee: nullable User do
-		var assignee = json["assignee"]
-		if not assignee isa JsonObject then return null
-		return new User.from_json(api, assignee)
+		var assignee = json.get_or_null("assignee")
+		if assignee isa JsonObject then return new User.from_json(api, assignee)
+		return null
+	end
+
+	# Set issue assignee.
+	fun assignee=(user: nullable User) do
+		if user == null then
+			json["assignee"] = null
+		else
+			json["assignee"] = user.json
+		end
 	end
 
 	# `Milestone` (if any).
 	fun milestone: nullable Milestone do
-		var milestone = json["milestone"]
-		if not milestone isa JsonObject then return null
-		return new Milestone.from_json(api, repo, milestone)
+		var milestone = json.get_or_null("milestone")
+		if milestone isa JsonObject then return new Milestone.from_json(api, repo, milestone)
+		return null
+	end
+
+	# Set issue milestone.
+	fun milestone=(milestone: nullable Milestone) do
+		if milestone == null then
+			json["milestone"] = null
+		else
+			json["milestone"] = milestone.json
+		end
 	end
 
 	# List of comments made on this issue.
@@ -741,46 +819,81 @@ class Issue
 			for obj in array do
 				if not obj isa JsonObject then continue
 				var id = obj["id"].as(Int)
-				res.add(api.load_issue_comment(repo, id).as(not null))
+				var comment = api.load_issue_comment(repo, id)
+				if comment == null then continue
+				res.add(comment)
 			end
 			page += 1
-			array = api.get("{key}/comments?page={page}").as(JsonArray)
+			var json = api.get("{key}/comments?page={page}")
+			if not json isa JsonArray then
+				return res
+			end
+			array = json
 		end
 		return res
 	end
 
 	# Number of comments on this issue.
-	fun comments_count: Int do return json["comments"].to_s.to_i
+	fun comments_count: Int do return json["comments"].as(Int)
 
 	# Creation time in ISODate format.
-	fun created_at: ISODate do
-		return new ISODate.from_string(json["created_at"].to_s)
+	fun created_at: ISODate do return new ISODate.from_string(json["created_at"].as(String))
+
+	# Set issue creation time.
+	fun created_at=(created_at: nullable ISODate) do
+		if created_at == null then
+			json["created_at"] = null
+		else
+			json["created_at"] = created_at.to_s
+		end
 	end
 
 	# Last update time in ISODate format (if any).
 	fun updated_at: nullable ISODate do
-		var res = json["updated_at"]
-		if res == null then return null
-		return new ISODate.from_string(res.to_s)
+		var res = json.get_or_null("updated_at")
+		if res isa String then return new ISODate.from_string(res)
+		return null
+	end
+
+	# Set issue last update time.
+	fun updated_at=(updated_at: nullable ISODate) do
+		if updated_at == null then
+			json["updated_at"] = null
+		else
+			json["updated_at"] = updated_at.to_s
+		end
 	end
 
 	# Close time in ISODate format (if any).
 	fun closed_at: nullable ISODate do
-		var res = json["closed_at"]
-		if res == null then return null
-		return new ISODate.from_string(res.to_s)
+		var res = json.get_or_null("closed_at")
+		if res isa String then return new ISODate.from_string(res)
+		return null
+	end
+
+	# Set issue close time.
+	fun closed_at=(closed_at: nullable ISODate) do
+		if closed_at == null then
+			json["closed_at"] = null
+		else
+			json["closed_at"] = closed_at.to_s
+		end
 	end
 
 	# TODO link to pull request
 
 	# Full description of the issue.
-	fun body: String  do return json["body"].to_s
+	fun body: String do return json["body"].as(String)
+
+	# Set description body
+	fun body=(body: String) do json["body"] = body
 
 	# List of events on this issue.
 	fun events: Array[IssueEvent] do
 		var res = new Array[IssueEvent]
 		var page = 1
-		var array = api.get("{key}/events?page={page}").as(JsonArray)
+		var array = api.get("{key}/events?page={page}")
+		if not array isa JsonArray then return res
 		while not array.is_empty do
 			for obj in array do
 				if not obj isa JsonObject then continue
@@ -794,10 +907,22 @@ class Issue
 
 	# User that closed this issue (if any).
 	fun closed_by: nullable User do
-		var closer = json["closed_by"]
-		if not closer isa JsonObject then return null
-		return new User.from_json(api, closer)
+		var closer = json.get_or_null("closed_by")
+		if closer isa JsonObject then return new User.from_json(api, closer)
+		return null
 	end
+
+	# Set user that closed the issue.
+	fun closed_by=(user: nullable User) do
+		if user == null then
+			json["closed_by"] = null
+		else
+			json["closed_by"] = user.json
+		end
+	end
+
+	# Is this issue linked to a pull request?
+	fun is_pull_request: Bool do return json.has_key("pull_request")
 end
 
 # A Github pull request.
@@ -813,16 +938,31 @@ class PullRequest
 
 	# Merge time in ISODate format (if any).
 	fun merged_at: nullable ISODate do
-		var res = json["merged_at"]
-		if res == null then return null
-		return new ISODate.from_string(res.to_s)
+		var res = json.get_or_null("merged_at")
+		if res isa String then return new ISODate.from_string(res)
+		return null
+	end
+
+	# Set pull request merge time.
+	fun merged_at=(merged_at: nullable ISODate) do
+		if merged_at == null then
+			json["merged_at"] = null
+		else
+			json["merged_at"] = merged_at.to_s
+		end
 	end
 
 	# Merge commit SHA.
-	fun merge_commit_sha: String do return json["merge_commit_sha"].to_s
+	fun merge_commit_sha: String do return json["merge_commit_sha"].as(String)
+
+	# Set merge_commit_sha
+	fun merge_commit_sha=(sha: String) do json["merge_commit_sha"] = sha
 
 	# Count of comments made on the pull request diff.
-	fun review_comments: Int do return json["review_comments"].to_s.to_i
+	fun review_comments: Int do return json["review_comments"].as(Int)
+
+	# Set review_comments
+	fun review_comments=(count: Int) do json["review_comments"] = count
 
 	# Pull request head (can be a commit SHA or a branch name).
 	fun head: PullRef do
@@ -830,41 +970,77 @@ class PullRequest
 		return new PullRef(api, json)
 	end
 
+	# Set head
+	fun head=(head: PullRef) do json["head"] = head.json
+
 	# Pull request base (can be a commit SHA or a branch name).
 	fun base: PullRef do
 		var json = json["base"].as(JsonObject)
 		return new PullRef(api, json)
 	end
 
+	# Set base
+	fun base=(base: PullRef) do json["base"] = base.json
+
 	# Is this pull request merged?
 	fun merged: Bool do return json["merged"].as(Bool)
 
+	# Set merged
+	fun merged=(merged: Bool) do json["merged"] = merged
+
 	# Is this pull request mergeable?
 	fun mergeable: Bool do return json["mergeable"].as(Bool)
 
+	# Set mergeable
+	fun mergeable=(mergeable: Bool) do json["mergeable"] = mergeable
+
 	# Mergeable state of this pull request.
 	#
 	# See <https://developer.github.com/v3/pulls/#list-pull-requests>.
-	fun mergeable_state: Int do return json["mergeable_state"].to_s.to_i
+	fun mergeable_state: Int do return json["mergeable_state"].as(Int)
+
+	# Set mergeable_state
+	fun mergeable_state=(mergeable_state: Int) do json["mergeable_state"] = mergeable_state
 
 	# User that merged this pull request (if any).
 	fun merged_by: nullable User do
-		var merger = json["merged_by"]
-		if not merger isa JsonObject then return null
-		return new User.from_json(api, merger)
+		var merger = json.get_or_null("merged_by")
+		if merger isa JsonObject then return new User.from_json(api, merger)
+		return null
+	end
+
+	# Set merged_by.
+	fun merged_by=(merged_by: nullable User) do
+		if merged_by == null then
+			json["merged_by"] = null
+		else
+			json["merged_by"] = merged_by.json
+		end
 	end
 
 	# Count of commits in this pull request.
-	fun commits: Int do return json["commits"].to_s.to_i
+	fun commits: Int do return json["commits"].as(Int)
+
+	# Set commits
+	fun commits=(commits: Int) do json["commits"] = commits
 
 	# Added line count.
-	fun additions: Int do return json["additions"].to_s.to_i
+	fun additions: Int do return json["additions"].as(Int)
+
+	# Set additions
+	fun additions=(additions: Int) do json["additions"] = additions
 
 	# Deleted line count.
-	fun deletions: Int do return json["deletions"].to_s.to_i
+	fun deletions: Int do return json["deletions"].as(Int)
+
+	# Set deletions
+	fun deletions=(deletions: Int) do json["deletions"] = deletions
 
 	# Changed files count.
-	fun changed_files: Int do return json["changed_files"].to_s.to_i
+	fun changed_files: Int do return json["changed_files"].as(Int)
+
+	# Set changed_files
+	fun changed_files=(changed_files: Int) do json["changed_files"] = changed_files
 end
 
 # A pull request reference (used for head and base).
@@ -877,23 +1053,38 @@ class PullRef
 	var json: JsonObject
 
 	# Label pointed by `self`.
-	fun labl: String do return json["label"].to_s
+	fun labl: String do return json["label"].as(String)
+
+	# Set labl
+	fun labl=(labl: String) do json["label"] = labl
 
 	# Reference pointed by `self`.
-	fun ref: String do return json["ref"].to_s
+	fun ref: String do return json["ref"].as(String)
+
+	# Set ref
+	fun ref=(ref: String) do json["ref"] = ref
 
 	# Commit SHA pointed by `self`.
-	fun sha: String do return json["sha"].to_s
+	fun sha: String do return json["sha"].as(String)
+
+	# Set sha
+	fun sha=(sha: String) do json["sha"] = sha
 
 	# User pointed by `self`.
 	fun user: User do
 		return new User.from_json(api, json["user"].as(JsonObject))
 	end
 
+	# Set user
+	fun user=(user: User) do json["user"] = user.json
+
 	# Repo pointed by `self`.
 	fun repo: Repo do
 		return new Repo.from_json(api, json["repo"].as(JsonObject))
 	end
+
+	# Set repo
+	fun repo=(repo: Repo) do json["repo"] = repo.json
 end
 
 # A Github label.
@@ -910,12 +1101,15 @@ class Label
 	var name: String
 
 	redef init from_json(api, repo, json) do
-		self.name = json["name"].to_s
+		self.name = json["name"].as(String)
 		super
 	end
 
 	# Label color code.
-	fun color: String do return json["color"].to_s
+	fun color: String do return json["color"].as(String)
+
+	# Set color
+	fun color=(color: String) do json["color"] = color
 end
 
 # A Github milestone.
@@ -937,49 +1131,97 @@ class Milestone
 	end
 
 	# Milestone title.
-	fun title: String do return json["title"].to_s
+	fun title: String do return json["title"].as(String)
+
+	# Set title
+	fun title=(title: String) do json["title"] = title
 
 	# Milestone long description.
-	fun description: String do return json["description"].to_s
+	fun description: String do return json["description"].as(String)
+
+	# Set description
+	fun description=(description: String) do json["description"] = description
 
 	# Count of opened issues linked to this milestone.
-	fun open_issues: Int do return json["open_issues"].to_s.to_i
+	fun open_issues: Int do return json["open_issues"].as(Int)
+
+	# Set open_issues
+	fun open_issues=(open_issues: Int) do json["open_issues"] = open_issues
 
 	# Count of closed issues linked to this milestone.
-	fun closed_issues: Int do return json["closed_issues"].to_s.to_i
+	fun closed_issues: Int do return json["closed_issues"].as(Int)
+
+	# Set closed_issues
+	fun closed_issues=(closed_issues: Int) do json["closed_issues"] = closed_issues
 
 	# Milestone state.
-	fun state: String do return json["state"].to_s
+	fun state: String do return json["state"].as(String)
+
+	# Set state
+	fun state=(state: String) do json["state"] = state
 
 	# Creation time in ISODate format.
 	fun created_at: ISODate do
-		return new ISODate.from_string(json["created_at"].to_s)
+		return new ISODate.from_string(json["created_at"].as(String))
 	end
 
+	# Set created_at
+	fun created_at=(created_at: ISODate) do json["created_at"] = created_at.to_s
+
 	# User that created this milestone.
 	fun creator: User do
 		return new User.from_json(api, json["creator"].as(JsonObject))
 	end
 
+	# Set creator
+	fun creator=(creator: User) do json["creator"] = creator.json
+
 	# Due time in ISODate format (if any).
 	fun due_on: nullable ISODate do
-		var res = json["updated_at"]
-		if res == null then return null
-		return new ISODate.from_string(res.to_s)
+		var res = json.get_or_null("updated_at")
+		if res isa String then return new ISODate.from_string(res)
+		return null
+	end
+
+	# Set due_on.
+	fun due_on=(due_on: nullable ISODate) do
+		if due_on == null then
+			json["due_on"] = null
+		else
+			json["due_on"] = due_on.to_s
+		end
 	end
 
 	# Update time in ISODate format (if any).
 	fun updated_at: nullable ISODate do
-		var res = json["updated_at"]
-		if res == null then return null
-		return new ISODate.from_string(res.to_s)
+		var res = json.get_or_null("updated_at")
+		if res isa String then return new ISODate.from_string(res)
+		return null
+	end
+
+	# Set updated_at.
+	fun updated_at=(updated_at: nullable ISODate) do
+		if updated_at == null then
+			json["updated_at"] = null
+		else
+			json["updated_at"] = updated_at.to_s
+		end
 	end
 
 	# Close time in ISODate format (if any).
 	fun closed_at: nullable ISODate do
-		var res = json["closed_at"]
-		if res == null then return null
-		return new ISODate.from_string(res.to_s)
+		var res = json.get_or_null("closed_at")
+		if res isa String then return new ISODate.from_string(res)
+		return null
+	end
+
+	# Set closed_at.
+	fun closed_at=(closed_at: nullable ISODate) do
+		if closed_at == null then
+			json["closed_at"] = null
+		else
+			json["closed_at"] = closed_at.to_s
+		end
 	end
 end
 
@@ -1006,19 +1248,38 @@ abstract class Comment
 		return new User.from_json(api, json["user"].as(JsonObject))
 	end
 
+	# Set user
+	fun user=(user: User) do json["user"] = user.json
+
 	# Creation time in ISODate format.
 	fun created_at: ISODate do
-		return new ISODate.from_string(json["created_at"].to_s)
+		return new ISODate.from_string(json["created_at"].as(String))
 	end
 
+	# Set created_at
+	fun created_at=(created_at: ISODate) do json["created_at"] = created_at.to_s
+
 	# Last update time in ISODate format (if any).
 	fun updated_at: nullable ISODate do
-		if not json.has_key("updated_at") then return null
-		return new ISODate.from_string(json["updated_at"].to_s)
+		var res = json.get_or_null("updated_at")
+		if res isa String then return new ISODate.from_string(res)
+		return null
+	end
+
+	# Set updated_at.
+	fun updated_at=(updated_at: nullable ISODate) do
+		if updated_at == null then
+			json["updated_at"] = null
+		else
+			json["updated_at"] = updated_at.to_s
+		end
 	end
 
 	# Comment body text.
-	fun body: String do return json["body"].to_s
+	fun body: String do return json["body"].as(String)
+
+	# Set body
+	fun body=(body: String) do json["body"] = body
 
 	# Does the comment contain an acknowledgement (+1)
 	fun is_ack: Bool
@@ -1035,27 +1296,37 @@ class CommitComment
 
 	# Commented commit.
 	fun commit: Commit do
-		return api.load_commit(repo, json["commit_id"].to_s).as(not null)
+		return api.load_commit(repo, json["commit_id"].as(String)).as(not null)
 	end
 
+	# Set commit
+	fun commit=(commit: Commit) do json["commit_id"] = commit.json
+
 	# Position of the comment on the line.
 	fun position: nullable String do
-		if not json.has_key("position") then return null
-		var res = json["position"]
-		if res == null then return null
-		return res.to_s
+		var res = json.get_or_null("position")
+		if res isa String then return res
+		return null
 	end
 
+	# Set position.
+	fun position=(position: nullable String) do json["position"] = position
+
 	# Line of the comment.
 	fun line: nullable String do
-		if not json.has_key("line") then return null
-		var res = json["line"]
-		if res == null then return null
-		return res.to_s
+		var res = json.get_or_null("line")
+		if res isa String then return res
+		return null
 	end
 
+	# Set line.
+	fun line=(line: nullable String) do json["line"] = line
+
 	# Path of the commented file.
-	fun path: String do return json["path"].to_s
+	fun path: String do return json["path"].as(String)
+
+	# Set path.
+	fun path=(path: String) do json["path"] = path
 end
 
 # Comments made on Github issue and pull request pages.
@@ -1075,7 +1346,10 @@ class IssueComment
 	end
 
 	# Link to the issue document on API.
-	fun issue_url: String do return json["issue_url"].to_s
+	fun issue_url: String do return json["issue_url"].as(String)
+
+	# Set issue_url.
+	fun issue_url=(issue_url: String) do json["issue_url"] = issue_url
 end
 
 # Comments made on Github pull request diffs.
@@ -1095,25 +1369,46 @@ class ReviewComment
 	end
 
 	# Link to the pull request on API.
-	fun pull_request_url: String do return json["pull_request_url"].to_s
+	fun pull_request_url: String do return json["pull_request_url"].as(String)
+
+	# Set pull_request_url.
+	fun pull_request_url=(pull_request_url: String) do json["pull_request_url"] = pull_request_url
 
 	# Diff hunk.
-	fun diff_hunk: String do return json["diff_hunk"].to_s
+	fun diff_hunk: String do return json["diff_hunk"].as(String)
+
+	# Set diff_hunk.
+	fun diff_hunk=(diff_hunk: String) do json["diff_hunk"] = diff_hunk
 
 	# Path of commented file.
-	fun path: String do return json["path"].to_s
+	fun path: String do return json["path"].as(String)
+
+	# Set path.
+	fun path=(path: String) do json["path"] = path
 
 	# Position of the comment on the file.
-	fun position: Int do return json["position"].to_s.to_i
+	fun position: Int do return json["position"].as(Int)
+
+	# Set position.
+	fun position=(position: Int) do json["position"] = position
 
 	# Original position in the diff.
-	fun original_position: Int do return json["original_position"].to_s.to_i
+	fun original_position: Int do return json["original_position"].as(Int)
+
+	# Set original_position.
+	fun original_position=(original_position: Int) do json["original_position"] = original_position
 
 	# Commit referenced by this comment.
-	fun commit_id: String do return json["commit_id"].to_s
+	fun commit_id: String do return json["commit_id"].as(String)
+
+	# Set commit_id.
+	fun commit_id=(commit_id: String) do json["commit_id"] = commit_id
 
 	# Original commit id.
-	fun original_commit_id: String do return json["original_commit_id"].to_s
+	fun original_commit_id: String do return json["original_commit_id"].as(String)
+
+	# Set original_commit_id.
+	fun original_commit_id=(commit_id: String) do json["original_commit_id"] = commit_id
 end
 
 # An event that occurs on a Github `Issue`.
@@ -1139,52 +1434,103 @@ class IssueEvent
 		return new Issue.from_json(api, repo, json["issue"].as(JsonObject))
 	end
 
+	# Set issue.
+	fun issue=(issue: Issue) do json["issue"] = issue.json
+
 	# User that initiated the event.
 	fun actor: User do
 		return new User.from_json(api, json["actor"].as(JsonObject))
 	end
 
+	# Set actor.
+	fun actor=(actor: User) do json["actor"] = actor.json
+
 	# Creation time in ISODate format.
 	fun created_at: ISODate do
-		return new ISODate.from_string(json["created_at"].to_s)
+		return new ISODate.from_string(json["created_at"].as(String))
 	end
 
+	# Set created_at.
+	fun created_at=(created_at: ISODate) do json["created_at"] = created_at.to_s
+
 	# Event descriptor.
-	fun event: String do return json["event"].to_s
+	fun event: String do return json["event"].as(String)
+
+	# Set event.
+	fun event=(event: String) do json["event"] = event
 
 	# Commit linked to this event (if any).
 	fun commit_id: nullable String do
-		var res = json["commit_id"]
-		if res == null then return null
-		return res.to_s
+		var res = json.get_or_null("commit_id")
+		if res isa String then return res
+		return null
 	end
 
+	# Set commit_id.
+	fun commit_id=(commit_id: nullable String) do json["commit_id"] = commit_id
+
 	# Label linked to this event (if any).
 	fun labl: nullable Label do
-		var res = json["label"]
-		if not res isa JsonObject then return null
-		return new Label.from_json(api, repo, res)
+		var res = json.get_or_null("label")
+		if res isa JsonObject then return new Label.from_json(api, repo, res)
+		return null
+	end
+
+	# Set labl.
+	fun labl=(labl: nullable Label) do
+		if labl == null then
+			json["labl"] = null
+		else
+			json["labl"] = labl.json
+		end
 	end
 
 	# User linked to this event (if any).
 	fun assignee: nullable User do
-		var res = json["assignee"]
-		if not res isa JsonObject then return null
-		return new User.from_json(api, res)
+		var res = json.get_or_null("assignee")
+		if res isa JsonObject then return new User.from_json(api, res)
+		return null
+	end
+
+	# Set assignee.
+	fun assignee=(assignee: nullable User) do
+		if assignee == null then
+			json["assignee"] = null
+		else
+			json["assignee"] = assignee.json
+		end
 	end
 
 	# Milestone linked to this event (if any).
 	fun milestone: nullable Milestone do
-		var res = json["milestone"]
-		if not res isa JsonObject then return null
-		return new Milestone.from_json(api, repo, res)
+		var res = json.get_or_null("milestone")
+		if res isa JsonObject then return new Milestone.from_json(api, repo, res)
+		return null
+	end
+
+	# Set milestone.
+	fun milestone=(milestone: nullable User) do
+		if milestone == null then
+			json["milestone"] = null
+		else
+			json["milestone"] = milestone.json
+		end
 	end
 
 	# Rename linked to this event (if any).
 	fun rename: nullable RenameAction do
-		var res = json["rename"]
-		if res == null then return null
-		return new RenameAction(res.as(JsonObject))
+		var res = json.get_or_null("rename")
+		if res isa JsonObject then return new RenameAction(res)
+		return null
+	end
+
+	# Set rename.
+	fun rename=(rename: nullable User) do
+		if rename == null then
+			json["rename"] = null
+		else
+			json["rename"] = rename.json
+		end
 	end
 end
 
@@ -1195,10 +1541,16 @@ class RenameAction
 	var json: JsonObject
 
 	# Name before renaming.
-	fun from: String do return json["from"].to_s
+	fun from: String do return json["from"].as(String)
+
+	# Set from.
+	fun from=(from: String) do json["from"] = from
 
 	# Name after renaming.
-	fun to: String do return json["to"].to_s
+	fun to: String do return json["to"].as(String)
+
+	# Set to.
+	fun to=(to: String) do json["to"] = to
 end
 
 # Contributors list with additions, deletions, and commit counts.
@@ -1219,8 +1571,7 @@ class ContributorStats
 
 	# Init `self` from a `json` object.
 	init from_json(api: GithubAPI, json: JsonObject) do
-		self.api = api
-		self.json = json
+		init(api, json)
 	end
 
 	# User these statistics are about.
@@ -1228,12 +1579,21 @@ class ContributorStats
 		return new User.from_json(api, json["author"].as(JsonObject))
 	end
 
+	# Set author.
+	fun author=(author: User) do json["author"] = author.json
+
 	# Total number of commit.
-	fun total: Int do return json["total"].to_s.to_i
+	fun total: Int do return json["total"].as(Int)
+
+	# Set total.
+	fun total=(total: Int) do json["total"] = total
 
 	# Are of weeks of activity with detailed statistics.
 	fun weeks: JsonArray do return json["weeks"].as(JsonArray)
 
+	# Set weeks.
+	fun weeks=(weeks: JsonArray) do json["weeks"] = weeks
+
 	# ContributorStats can be compared on the total amount of commits.
 	redef fun <(o) do return total < o.total
 end
@@ -1247,5 +1607,8 @@ class GithubFile
 	var json: JsonObject
 
 	# File name.
-	fun filename: String do return json["filename"].to_s
+	fun filename: String do return json["filename"].as(String)
+
+	# Set filename.
+	fun filename=(filename: String) do json["filename"] = filename
 end