diff --git a/src/main/scala/model/BaseTable.scala b/src/main/scala/model/BaseTable.scala
deleted file mode 100644
index ebe986d..0000000
--- a/src/main/scala/model/BaseTable.scala
+++ /dev/null
@@ -1,15 +0,0 @@
-package model
-
-import scala.slick.driver.H2Driver.simple._
-
-protected[model] abstract class BaseTable[T](_tableName: String) extends Table[T](_tableName) {
-  def userName = column[String]("USER_NAME")
-  def repositoryName = column[String]("REPOSITORY_NAME")
-  def base = userName ~ repositoryName
-
-  def repository(owner: String, repository: String) =
-    (userName is owner.bind) && (repositoryName is repository.bind)
-
-  def repository(other: BaseTable[T]) =
-    (userName is other.userName) && (repositoryName is other.repositoryName)
-}
diff --git a/src/main/scala/model/BasicTemplate.scala b/src/main/scala/model/BasicTemplate.scala
new file mode 100644
index 0000000..971a5db
--- /dev/null
+++ b/src/main/scala/model/BasicTemplate.scala
@@ -0,0 +1,34 @@
+package model
+
+import scala.slick.driver.H2Driver.simple._
+
+protected[model] trait BasicTemplate { self: Table[_] =>
+  def userName = column[String]("USER_NAME")
+  def repositoryName = column[String]("REPOSITORY_NAME")
+
+  def byRepository(owner: String, repository: String) =
+    (userName is owner.bind) && (repositoryName is repository.bind)
+
+  def byRepository(userName: Column[String], repositoryName: Column[String]) =
+    (this.userName is userName) && (this.repositoryName is repositoryName)
+}
+
+protected[model] trait IssueTemplate extends BasicTemplate { self: Table[_] =>
+  def issueId = column[Int]("ISSUE_ID")
+
+  def byIssue(owner: String, repository: String, issueId: Int) =
+    byRepository(owner, repository) && (this.issueId is issueId.bind)
+
+  def byIssue(userName: Column[String], repositoryName: Column[String], issueId: Column[Int]) =
+    byRepository(userName, repositoryName) && (this.issueId is issueId)
+}
+
+protected[model] trait LabelTemplate extends BasicTemplate { self: Table[_] =>
+  def labelId = column[Int]("LABEL_ID")
+
+  def byLabel(owner: String, repository: String, labelId: Int) =
+    byRepository(owner, repository) && (this.labelId is labelId.bind)
+
+  def byLabel(userName: Column[String], repositoryName: Column[String], labelId: Column[Int]) =
+    byRepository(userName, repositoryName) && (this.labelId is labelId)
+}
\ No newline at end of file
diff --git a/src/main/scala/model/Collaborator.scala b/src/main/scala/model/Collaborator.scala
index 644e775..0232365 100644
--- a/src/main/scala/model/Collaborator.scala
+++ b/src/main/scala/model/Collaborator.scala
@@ -1,11 +1,10 @@
 package model
 
 import scala.slick.driver.H2Driver.simple._
-import model.{BaseTable => Table}
 
-object Collaborators extends Table[Collaborator]("COLLABORATOR") {
+object Collaborators extends Table[Collaborator]("COLLABORATOR") with BasicTemplate {
   def collaboratorName = column[String]("COLLABORATOR_NAME")
-  def * = base ~ collaboratorName <> (Collaborator, Collaborator.unapply _)
+  def * = userName ~ repositoryName ~ collaboratorName <> (Collaborator, Collaborator.unapply _)
 }
 
 case class Collaborator(
diff --git a/src/main/scala/model/Issue.scala b/src/main/scala/model/Issue.scala
index 5de5312..402fce7 100644
--- a/src/main/scala/model/Issue.scala
+++ b/src/main/scala/model/Issue.scala
@@ -1,15 +1,12 @@
 package model
 
 import scala.slick.driver.H2Driver.simple._
-import model.{BaseTable => Table}
 
-object IssueId extends Table[(String, String, Int)]("ISSUE_ID") {
-  def issueId = column[Int]("ISSUE_ID")
-  def * = base ~ issueId
+object IssueId extends Table[(String, String, Int)]("ISSUE_ID") with IssueTemplate {
+  def * = userName ~ repositoryName ~ issueId
 }
 
-object Issues extends Table[Issue]("ISSUE") with Functions {
-  def issueId = column[Int]("ISSUE_ID")
+object Issues extends Table[Issue]("ISSUE") with IssueTemplate with Functions {
   def openedUserName = column[String]("OPENED_USER_NAME")
   def milestoneId = column[Int]("MILESTONE_ID")
   def assignedUserName = column[String]("ASSIGNED_USER_NAME")
@@ -18,7 +15,7 @@
   def closed = column[Boolean]("CLOSED")
   def registeredDate = column[java.util.Date]("REGISTERED_DATE")
   def updatedDate = column[java.util.Date]("UPDATED_DATE")
-  def * = base ~ issueId ~ openedUserName ~ milestoneId.? ~ assignedUserName.? ~ title ~ content.? ~ closed ~ registeredDate ~ updatedDate <> (Issue, Issue.unapply _)
+  def * = userName ~ repositoryName ~ issueId ~ openedUserName ~ milestoneId.? ~ assignedUserName.? ~ title ~ content.? ~ closed ~ registeredDate ~ updatedDate <> (Issue, Issue.unapply _)
 }
 
 case class Issue(
diff --git a/src/main/scala/model/IssueComment.scala b/src/main/scala/model/IssueComment.scala
index a3c5c50..38beae6 100644
--- a/src/main/scala/model/IssueComment.scala
+++ b/src/main/scala/model/IssueComment.scala
@@ -1,18 +1,16 @@
 package model
 
 import scala.slick.driver.H2Driver.simple._
-import model.{BaseTable => Table}
 
-object IssueComments extends Table[IssueComment]("ISSUE_COMMENT") with Functions {
-  def issueId = column[Int]("ISSUE_ID")
+object IssueComments extends Table[IssueComment]("ISSUE_COMMENT") with IssueTemplate with Functions {
   def commentId = column[Int]("COMMENT_ID", O AutoInc)
   def commentedUserName = column[String]("COMMENTED_USER_NAME")
   def content = column[String]("CONTENT")
   def registeredDate = column[java.util.Date]("REGISTERED_DATE")
   def updatedDate = column[java.util.Date]("UPDATED_DATE")
-  def * = base ~ issueId ~ commentId ~ commentedUserName ~ content ~ registeredDate ~ updatedDate <> (IssueComment, IssueComment.unapply _)
+  def * = userName ~ repositoryName ~ issueId ~ commentId ~ commentedUserName ~ content ~ registeredDate ~ updatedDate <> (IssueComment, IssueComment.unapply _)
 
-  def autoInc = base ~ issueId ~ commentedUserName ~ content ~ registeredDate ~ updatedDate returning commentId
+  def autoInc = userName ~ repositoryName ~ issueId ~ commentedUserName ~ content ~ registeredDate ~ updatedDate returning commentId
 }
 
 case class IssueComment(
diff --git a/src/main/scala/model/IssueLabels.scala b/src/main/scala/model/IssueLabels.scala
index db27dda..16a7469 100644
--- a/src/main/scala/model/IssueLabels.scala
+++ b/src/main/scala/model/IssueLabels.scala
@@ -1,12 +1,9 @@
 package model
 
 import scala.slick.driver.H2Driver.simple._
-import model.{BaseTable => Table}
 
-object IssueLabels extends Table[IssueLabel]("ISSUE_LABEL") {
-  def issueId = column[Int]("ISSUE_ID")
-  def labelId = column[Int]("LABEL_ID")
-  def * = base ~ issueId ~ labelId <> (IssueLabel, IssueLabel.unapply _)
+object IssueLabels extends Table[IssueLabel]("ISSUE_LABEL") with IssueTemplate with LabelTemplate {
+  def * = userName ~ repositoryName ~ issueId ~ labelId <> (IssueLabel, IssueLabel.unapply _)
 }
 
 case class IssueLabel(
diff --git a/src/main/scala/model/Labels.scala b/src/main/scala/model/Labels.scala
index e5b66f2..188af73 100644
--- a/src/main/scala/model/Labels.scala
+++ b/src/main/scala/model/Labels.scala
@@ -1,14 +1,13 @@
 package model
 
 import scala.slick.driver.H2Driver.simple._
-import model.{BaseTable => Table}
 
-object Labels extends Table[Label]("LABEL") {
-  def labelId = column[Int]("LABEL_ID", O AutoInc)
+object Labels extends Table[Label]("LABEL") with LabelTemplate {
   def labelName = column[String]("LABEL_NAME")
   def color = column[String]("COLOR")
-  def * = base ~ labelId ~ labelName ~ color <> (Label, Label.unapply _)
-  def ins = base ~ labelName ~ color
+  def * = userName ~ repositoryName ~ labelId ~ labelName ~ color <> (Label, Label.unapply _)
+
+  def ins = userName ~ repositoryName ~ labelName ~ color
 }
 
 case class Label(
diff --git a/src/main/scala/model/Milestone.scala b/src/main/scala/model/Milestone.scala
index 048dbba..334b014 100644
--- a/src/main/scala/model/Milestone.scala
+++ b/src/main/scala/model/Milestone.scala
@@ -1,17 +1,16 @@
 package model
 
 import scala.slick.driver.H2Driver.simple._
-import model.{BaseTable => Table}
 
-object Milestones extends Table[Milestone]("MILESTONE") with Functions {
+object Milestones extends Table[Milestone]("MILESTONE") with BasicTemplate with Functions {
   def milestoneId = column[Int]("MILESTONE_ID", O AutoInc)
   def title = column[String]("TITLE")
   def description = column[String]("DESCRIPTION")
   def dueDate = column[java.util.Date]("DUE_DATE")
   def closedDate = column[java.util.Date]("CLOSED_DATE")
-  def * = base ~ milestoneId ~ title ~ description.? ~ dueDate.? ~ closedDate.? <> (Milestone, Milestone.unapply _)
+  def * = userName ~ repositoryName ~ milestoneId ~ title ~ description.? ~ dueDate.? ~ closedDate.? <> (Milestone, Milestone.unapply _)
 
-  def autoInc = base ~ title ~ description.? ~ dueDate.? ~ closedDate.? returning milestoneId
+  def autoInc = userName ~ repositoryName ~ title ~ description.? ~ dueDate.? ~ closedDate.? returning milestoneId
 }
 
 case class Milestone(
diff --git a/src/main/scala/model/Repository.scala b/src/main/scala/model/Repository.scala
index 3408ca8..0ef8a0a 100644
--- a/src/main/scala/model/Repository.scala
+++ b/src/main/scala/model/Repository.scala
@@ -1,16 +1,15 @@
 package model
 
 import scala.slick.driver.H2Driver.simple._
-import model.{BaseTable => Table}
 
-object Repositories extends Table[Repository]("REPOSITORY") with Functions {
+object Repositories extends Table[Repository]("REPOSITORY") with BasicTemplate with Functions {
   def isPrivate = column[Boolean]("PRIVATE")
   def description = column[String]("DESCRIPTION")
   def defaultBranch = column[String]("DEFAULT_BRANCH")
   def registeredDate = column[java.util.Date]("REGISTERED_DATE")
   def updatedDate = column[java.util.Date]("UPDATED_DATE")
   def lastActivityDate = column[java.util.Date]("LAST_ACTIVITY_DATE")
-  def * = base ~ isPrivate ~ description.? ~ defaultBranch ~ registeredDate ~ updatedDate ~ lastActivityDate <> (Repository, Repository.unapply _)
+  def * = userName ~ repositoryName ~ isPrivate ~ description.? ~ defaultBranch ~ registeredDate ~ updatedDate ~ lastActivityDate <> (Repository, Repository.unapply _)
 }
 
 case class Repository(