I am trying to develop a module in odoo 8 wich displays a filter, by wich I can filter the payment methods according to the journal_id (bank / check / ... )

here is my xml code for the filter method:

<record id="view_voucher_inherit_filter" model="ir.ui.view">

<field name="name">checks.search</field>

<field name="model">account.voucher</field>

<field name="inherit_id" ref="account_voucher.view_voucher_filter"/>

<field name="arch" type="xml">

<filter string="Posted" position="after">

<filter icon="terp" string="Cheques" domain="[('journal_id', '=', 'bank')]" help="Checks"/>

</filter>

</field>

</record>

the filter did not display the fields (payment) by the appropriate journal method because in the database journal_id is an integer field.

any help plz