diff --git a/.travis.yml b/.travis.yml
index 79be997af..4b204162e 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -37,8 +37,8 @@ before_install:
 install: 
   - sudo apt-get update && sudo apt-get install -y libldap2-dev 
   - sudo apt-get remove -y mysql-common mysql-server-5.5 mysql-server-core-5.5 mysql-client-5.5 mysql-client-core-5.5
-  - sudo apt-get autoremove
-  - sudo apt-get install libaio1
+  - sudo apt-get autoremove -y
+  - sudo apt-get install -y libaio1
   - wget -O mysql-5.6.14.deb http://dev.mysql.com/get/Downloads/MySQL-5.6/mysql-5.6.14-debian6.0-x86_64.deb/from/http://cdn.mysql.com/
   - sudo dpkg -i mysql-5.6.14.deb
   - sudo cp /opt/mysql/server-5.6/support-files/mysql.server /etc/init.d/mysql.server
diff --git a/models/accesslog.go b/models/accesslog.go
index 336e7bd08..defc7e37d 100644
--- a/models/accesslog.go
+++ b/models/accesslog.go
@@ -21,7 +21,7 @@ import (
 
 // AccessLog holds information about logs which are used to record the actions that user take to the resourses.
 type AccessLog struct {
-	LogID          int       `orm:"column(log_id)" json:"log_id"`
+	LogID          int       `orm:"pk;column(log_id)" json:"log_id"`
 	UserID         int       `orm:"column(user_id)"  json:"user_id"`
 	ProjectID      int64     `orm:"column(project_id)"  json:"project_id"`
 	RepoName       string    `orm:"column(repo_name)" json:"repo_name"`
diff --git a/models/project.go b/models/project.go
index 7f5d54c25..e16f0ce5f 100644
--- a/models/project.go
+++ b/models/project.go
@@ -21,7 +21,7 @@ import (
 
 // Project holds the details of a project.
 type Project struct {
-	ProjectID       int64     `orm:"column(project_id)" json:"project_id"`
+	ProjectID       int64     `orm:"pk;column(project_id)" json:"project_id"`
 	OwnerID         int       `orm:"column(owner_id)" json:"owner_id"`
 	Name            string    `orm:"column(name)" json:"name"`
 	CreationTime    time.Time `orm:"column(creation_time)" json:"creation_time"`
diff --git a/models/user.go b/models/user.go
index 241a25549..1b8b2ae86 100644
--- a/models/user.go
+++ b/models/user.go
@@ -21,7 +21,7 @@ import (
 
 // User holds the details of a user.
 type User struct {
-	UserID   int    `orm:"column(user_id)" json:"user_id"`
+	UserID   int    `orm:"pk;column(user_id)" json:"user_id"`
 	Username string `orm:"column(username)" json:"username"`
 	Email    string `orm:"column(email)" json:"email"`
 	Password string `orm:"column(password)" json:"password"`