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Jose Artavia 
In model account_invoice.py I have the following doc type:

TYPE2REFUND = {
    'out_invoice': 'out_refund',        # Customer Invoice
    'in_invoice': 'in_refund',          # Vendor Bill
    'out_refund': 'out_invoice',        # Customer Refund
    'in_refund': 'in_invoice',          # Vendor Refund
}

What I need to know is how to "assign the actual invoice type" to a variable in order 
to evaluate it in an if, something like this:

if type in ('out_invoice', 'out_refund'):
  #here assign the document type to a variable.

The problem is that I can't get the invoice type in the variable. 

This is my code: 

class einvoice_base_document(models.Model):
    _inherit = "account.invoice"

    doc_type = fields.Char("Tipo de documento", compute='get_doc_type')

@api.multi
def _get_doc_type(self):
    self.doc_type = self._context('type')
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Ray Carnes

Thanks Ray, I already resolved this using: self._context('type')

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subbarao
Melhor resposta

Context have {'default_type':'out_invoice', 'type':'out_invoice'} in case of Customer Invoice so you can get self._context('default_type') or self._context('type').

Context have {'default_type':'in_invoice', 'type':'in_invoice'} in case of Vendor Bill so you can get self._context('default_type') or self._context('type')

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Ray Carnes
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How about using the TYPE field on the Invoice (there is already a field called TYPE which has the Invoice type assigned to it)?

This field already exists and is how Odoo lets users see the Invoice Type.

type = fields.Selection([
            ('out_invoice','Customer Invoice'),
            ('in_invoice','Vendor Bill'),
            ('out_refund','Customer Credit Note'),
            ('in_refund','Vendor Credit Note'),
        ], readonly=True, index=True, change_default=True,
        default=lambda self: self._context.get('type', 'out_invoice'),
track_visibility='always')

For example, the Customer Invoices Window Action has this domain:

[('type','=','out_invoice')]
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Vysakh B Thottarath
Melhor resposta

For odoo11 use self._context.get('type')

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