# polymorphicHasMany
## Usage
A `polymorphicHasMany` relationship is a `one-to-many` relationship. This relationship is used when an entity can belong to multiple types of entities. The classic example for this type of relationship is `Posts`, `Videos`, and `Comments`.
```javascript
// Post.cfc
component extends="quick.models.BaseEntity" accessors="true" {
function comments() {
return polymorphicHasMany( "Comment", "commentable" );
}
}
```
```javascript
// Video.cfc
component extends="quick.models.BaseEntity" accessors="true" {
function comments() {
return polymorphicHasMany( "Comment", "commentable" );
}
}
```
The first value passed to `polymophicHasMany` is a WireBox mapping to the related entity.
The second value is a `prefix` for the polymorphic type. A common convention where is to add `able` to the end of the entity name, though this is not automatically done. In our example, this prefix is `commentable`. This tells quick to look for a `commentable_type` and a `commentable_id` column in our `Comment` entity. It stores our entity's mapping as the `_type` and our entity's primary key value as the `_id`.
The inverse of `polymophicHasMany` is `polymorphicBelongsTo`.
```javascript
// Comment.cfc
component extends="quick.models.BaseEntity" accessors="true" {
function post() {
return polymorphicBelongsTo( "commentable" );
}
}
```
## Signature
| Name | Type | Required | Default | Description |
| ------------------ | ------------------- | -------- | ------------------------------------------------------------------ | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| relationName | String | `true` | | The WireBox mapping for the related entity. |
| name | String | `true` | | The name given to the polymorphic relationship. |
| type | String | `false` | `name & "_type"` | The column name that defines the type of the polymorphic relationship. |
| id | String | `false` | `name & "_id"` | The column name that defines the id of the polymorphic relationship. |
| localKey | String \| \[String] | `false` | `keyNames()` | The local primary key on the parent entity. |
| relationMethodName | String | `false` | The method name called on the entity to produce this relationship. | The method name called to retrieve this relationship. Uses a stack backtrace to determine by default.
DO NOT PASS A VALUE HERE UNLESS YOU KNOW WHAT YOU ARE DOING.
|
Returns a polymorphicHasMany relationship between this entity and the entity defined by `relationName`.
## Visualizer
{% embed url="" %}
---
# Agent Instructions: Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.
Perform an HTTP GET request on the current page URL with the `ask` query parameter:
```
GET https://quick.ortusbooks.com/8.0.0-1/guide/relationships/relationship-types/polymorphichasmany.md?ask=
```
The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.
Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.