How to pass argument in PrimeNG's SplitButton?

Question

This is my MenuItem array:

this.ButtonItems = [
  {label: 'Edit', icon: 'fa fa-pencil-alt', command: (x) => {
      this.onEditDocument(x);
  }},
  {label: 'Duplicate', icon: 'pi pi-times', command: (x) => {
      this.onDuplicate(x);
  }}
];

Both functions need a parameter of type string (item.id).

Here is my template:

<p-splitButton 
    label="Save" 
    icon="i-btn fa fa-search" 
    title="View document"
    (onClick)="onViewDocument(item.id)" 
    [model]="ButtonItems(item.id)"></p-splitButton>

The code doesn't compile. I was trying to follow this example but I don't understand it. How can I get this right?

UPDATE:

My splitbutton is next to each item in the following table:

<p-table 
    [value]="currentDocuments" 
    [responsive]="true" 
    [columns]="cols" 
    [paginator]="true" 
    [rows]="10" 
    [showCurrentPageReport]="true" 
    styleClass="p-datatable-responsive-demo" 
    currentPageReportTemplate="Showing {first} to {last} of {totalRecords} entries">
    <ng-template pTemplate="header" let-columns>
        <tr>
            <th *ngFor="let col of columns">
                <div class="header-no-overflow">{{col.header}}</div>
            </th>
            <th style="width: 60px;"></th>            
        </tr>
    </ng-template>
    <ng-template pTemplate="body" let-item let-columns="columns">
        <tr>
            <td *ngFor="let col of columns" >
                <span class="p-column-title">{{col.header}}</span>
                <div *ngIf="col.type != 'File Uploader'">
                    {{item[col.field]}}
                </div>
                <div *ngIf="col.type == 'File Uploader'">
                    <div *ngFor="let file of item[col.field]">
                        <a [href]="file.downloadUrl" target="_blank">{{file.name}} </a>
                    </div>
                </div>
            </td>
            <td>
                <ng-container *ngFor="let buttonItem of ButtonItems">
                    <p-splitButton 
                        label="Save" 
                        icon="i-btn fa fa-search" 
                        title="View document"
                        (onClick)="onViewDocument(item.id)" 
                        [model]="buttonItem(item.id)"
                    ></p-splitButton>
                </ng-container>
            </td>
        </tr>
    </ng-template>
</p-table>

I added this here to explain my scenario in more detail.

My MenuItem looks like so:

this.ButtonItems = [
      [{ label: 'Edit', icon: 'fa fa-pencil-alt', command: (x: string) => this.onEditDocument(x) }],
      [{ label: 'Duplicate', icon: 'pi pi-times', command: (x: string) => this.onDuplicateDocument(x) }]
    ];

I want to add split buttons on each of the items in the table. The two buttons (edit and duplicate should be moved to items in the splitbutton. Here is a image to illustrate what i mean:

Answer 1

I gave a try to others solution but they didn't work! so I have to find my own workaround for resolving this problem. Here is the thing, the split-button has two events "onClick" & "onDropdownClick", the second event will be triggered before executing the command function of button options! so I'm setting my wished value on that event (I mean onDropDownClick) and then when I'm calling the command function I have that value. take a look at my code, and u definitely better understand what I'm talking about.

 <p-splitButton
                class="w-100"
                [label]="'SHARED.EDIT' | translate"
                [title]="'PRODUCTS.EDIT_PRODUCT' | translate"
                icon="pi pi-eye"
                (onClick)="editProduct(item.id)"
                [model]="recordMenuItems"
                (onDropdownClick)="handleActionsClick(item)"
              >
              </p-splitButton>

 public selectedProductForExecutingAction: any = null;

  public handleActionsClick(product) {
    this.selectedProductForExecutingAction = product;
  }

  public recordMenuItems: MenuItem[] = [
    {
      label: 'Copy',
      icon: 'pi pi-copy',
      command: (event) => {
        this.copy(this.selectedProductForExecutingAction.id);
      }
    },
    {
      label: 'Delete Product',
      icon: 'pi pi-times',
      command: (event) => {
        this.deleteProduct(this.selectedProductForExecutingAction);
      }
    }
  ];