Fix model composition.

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)
+}