#fb chatbot auto reply function
## Feature
### Admin Can...

* List pages under his management
* List recently posts for certain page
* Setup some post reply rules/templates for certain post
  * rules can be either wildcard or keywords 
* Setup some private message reply rules/content for certain page
  * rules can be either wildcard or keywords
* CRUD all post reply rules
* CRUD all post reply templates
* CRUD all private message reply rules/content


### System will...

* Auto reply post under certain post
* Auto reply private message for certain page
* Save all post content
* Save all post replies
* Save all private message


##Model 
### Admin
```
has_many :page_ownerships
has_many :pages, through: :page_managerships
```

### PageManagership
```
belongs_to :admin
belongs_to :page
```

* admin_id
* page_id

### Page
```
has_many :page_ownerships
has_many :admins, through: : page_managerships
has_many :posts
has_many :pm_reply_rules, class: MessageReplyRule

.auto_reply_post(user_input)
.auto_reply_pm(user_input)
```

* facebook_id
* name

### Post
```
belongs_to :page
has_many: :reply_rules, class: PostReplyRule
```

* page_id
* facebook_id

### PostReplyRule
```
belongs_to :post
```

* post_id
* reply_type, [wildcard, keywords]
* keywords
* reply\_template\_id
* enable

### PostReplyTemplate
```
belongs_to :page
```

* page_id
* content, text

### PrivateMessage
```
belongs_to :page
```

* page_id
* sender\_facebook\_id
* receipt\_facebook\_id
* message\_reply\_rule\_id

### MessageReplyRule
```
belongs_to :page
```

* page_id
* reply_type, [wildcard, keywords]
* keywords
* reply_content
* enable