# Column

**Kind:** Class

**Source:** `Pams/Web/Pams.WebApp/Client/app/models/dashboard/data-source-schema/column.model.ts` (line 2)

**Part of:** [Pams](subsystem-pams)

`Column` represents a column in a dashboard data-source schema. It supports copying an individual column with `clone()` and copying a collection of columns with `cloneList()` so callers can work with separate model instances.

## Methods

| Method | Signature | Returns |
|---|---|---|
| `cloneList` | `cloneList(model: Column[])` | `void` |
| `clone` | `clone(model: Column)` | `void` |

## Properties

| Property | Type |
|---|---|
| `Id` | `string` |
| `Name` | `string` |
| `ColumnId` | `string` |
| `ColumnFullName` | `string` |
| `IsPrimary` | `boolean` |
| `IsForeign` | `boolean` |
| `IsIdentity` | `boolean` |
| `AllowNull` | `boolean` |
| `IsComputed` | `boolean` |
| `ColumnDataType` | `ColumnDataType` |
| `IsSelected` | `boolean` |

## Where it refuses work

- `Column` stops the work with an early return when `model == null || model.length == 0`.
- `Column` stops the work with an early return when `model == null`.

## Diagram

```mermaid
graph LR
  Schema[Data-source schema] --> Column[Column]
  Column --> Clone[clone()]
  Column --> CloneList[cloneList()]
  Clone --> ColumnCopy[Copied Column]
  CloneList --> ColumnCopies[Copied Column list]
```

## Usage

```ts
import { Column } from './models/dashboard/data-source-schema/column.model';

const copiedColumn = column.clone();

const copiedColumns = Column.cloneList(schema.columns);

// Update copiedColumn or copiedColumns without changing the source instances.
```

## AI Coding Instructions

- Call `clone()` before changing a `Column` that may also be referenced by another schema or view.
- Use `Column.cloneList()` when copying schema column collections instead of copying only the array reference.
- Keep column-copy behavior inside this model so consumers do not manually recreate column instances.
- Check whether calling code expects copied columns before adding mutations to dashboard schema flows.

## Relationships

- IMPORTS → `ColumnDataType`

## Used by

3 references from 3 files. Each is a place in this repository where the symbol is actually used — go read one rather than trusting an example.

### Imported by (3)

- `DataSourceService` — `Pams/Web/Pams.WebApp/Client/app/services/dashboard/data-source.service.ts`:1
- `Table` — `Pams/Web/Pams.WebApp/Client/app/models/dashboard/data-source-schema/table.model.ts`:6
- `View` — `Pams/Web/Pams.WebApp/Client/app/models/dashboard/data-source-schema/view.model.ts`:4