python - 如何使用 fields_get 方法编辑 View ？

Question

我正在尝试实现与发票行表单类似的效果，其中某些列根据下拉列表中的选择出现或消失(编辑 View ？)。

我正在研究account_invoice_layout中实现这种效果的代码，但有点难以理解。

完整代码如下:

class account_invoice_line(osv.osv):

def move_line_get_item(self, cr, uid, line, context=None):
    if line.state != 'article':
        return None
    return super(account_invoice_line, self).move_line_get_item(cr, uid, line, context)

def fields_get(self, cr, uid, fields=None, context=None):
    article = {
        'article': [('readonly', False), ('invisible', False)],
        'text': [('readonly', True), ('invisible', True), ('required', False)],
        'subtotal': [('readonly', True), ('invisible', True), ('required', False)],
        'title': [('readonly', True), ('invisible', True), ('required', False)],
        'break': [('readonly', True), ('invisible', True), ('required', False)],
        'line': [('readonly', True), ('invisible', True), ('required', False)],
    }
    states = {
        'name': {
            'break': [('readonly', True),('required', False),('invisible', True)],
            'line': [('readonly', True),('required', False),('invisible', True)],
            },
        'product_id': article,
        'account_id': article,
        'quantity': article,
        'uos_id': article,
        'price_unit': article,
        'discount': article,
        'invoice_line_tax_id': article,
        'account_analytic_id': article,
    }
    res = super(account_invoice_line, self).fields_get(cr, uid, fields, context)
    for field in res:
        if states.has_key(field):
            for key,value in states[field].items():
                res[field].setdefault('states',{})
                res[field]['states'][key] = value
    return res

def onchange_invoice_line_view(self, cr, uid, id, type, context=None, *args):

    if (not type):
        return {}
    if type != 'article':
        temp = {'value': {
                'product_id': False,
                'uos_id': False,
                'account_id': False,
                'price_unit': False,
                'price_subtotal': False,
                'quantity': 0,
                'discount': False,
                'invoice_line_tax_id': False,
                'account_analytic_id': False,
                },
            }
        if type == 'line':
            temp['value']['name'] = ' '
        if type == 'break':
            temp['value']['name'] = ' '
        if type == 'subtotal':
            temp['value']['name'] = 'Sub Total'
        return temp
    return {}

def create(self, cr, user, vals, context=None):
    if vals.has_key('state'):
        if vals['state'] == 'line':
            vals['name'] = ' '
        if vals['state'] == 'break':
            vals['name'] = ' '
        if vals['state'] != 'article':
            vals['quantity']= 0
            vals['account_id']= self._default_account(cr, user, None)
    return super(account_invoice_line, self).create(cr, user, vals, context)

def write(self, cr, user, ids, vals, context=None):
    if vals.has_key('state'):
        if vals['state'] != 'article':
            vals['product_id']= False
            vals['uos_id']= False
            vals['account_id']= self._default_account(cr, user, None)
            vals['price_unit']= False
            vals['price_subtotal']= False
            vals['quantity']= 0
            vals['discount']= False
            vals['invoice_line_tax_id']= False
            vals['account_analytic_id']= False
        if vals['state'] == 'line':
            vals['name'] = ' '
        if vals['state'] == 'break':
            vals['name'] = ' '
    return super(account_invoice_line, self).write(cr, user, ids, vals, context)

def copy_data(self, cr, uid, id, default=None, context=None):
    if default is None:
        default = {}
    default['state'] = self.browse(cr, uid, id, context=context).state
    return super(account_invoice_line, self).copy_data(cr, uid, id, default, context)

def _fnct(self, cr, uid, ids, name, args, context=None):
    res = {}
    lines = self.browse(cr, uid, ids, context=context)
    account_ids = [line.account_id.id for line in lines]
    account_names = dict(self.pool.get('account.account').name_get(cr, uid, account_ids, context=context))
    for line in lines:
        if line.state != 'article':
            if line.state == 'line':
                res[line.id] = '-----------------------------------------'
            elif line.state == 'break':
                res[line.id] = 'PAGE BREAK'
            else:
                res[line.id] = ' '
        else:
            res[line.id] = account_names.get(line.account_id.id, '')
    return res

_name = "account.invoice.line"
_order = "invoice_id, sequence asc"
_description = "Invoice Line"
_inherit = "account.invoice.line"
_columns = {
    'state': fields.selection([
            ('article','Product'),
            ('title','Title'),
            ('text','Note'),
            ('subtotal','Sub Total'),
            ('line','Separator Line'),
            ('break','Page Break'),]
        ,'Type', select=True, required=True),
    'sequence': fields.integer('Sequence Number', select=True, help="Gives the sequence order when displaying a list of invoice lines."),
    'functional_field': fields.function(_fnct, arg=None, fnct_inv=None, fnct_inv_arg=None, type='char', fnct_search=None, obj=None, store=False, string="Source Account"),
}

def _default_account(self, cr, uid, context=None):
    cr.execute("select id from account_account where parent_id IS NULL LIMIT 1")
    res = cr.fetchone()
    return res[0]

_defaults = {
    'state': 'article',
    'sequence': 0,
}

account_invoice_line()

fields_get 方法究竟做了什么？什么时候执行？上述代码如何设法编辑 View ？

谢谢。

Answer 1

事实上 fields_get() 返回模块的字段定义。在字段定义中，您可以提供状态参数。

默认情况下，它在字段定义上是这样工作的:

states = {'draft':[('readonly','=',True)]}

当状态表单处于“草稿”状态时，它将字段设置为只读。

变量states 和articles 存储相同的值。

现在在您向我们展示的模块中，状态字段值与通常值不同:

[('article','Product'),
            ('title','Title'),
            ('text','Note'),
            ('subtotal','Sub Total'),
            ('line','Separator Line'),
            ('break','Page Break'),]

在 fields_get() 函数的最后一部分，我们有:

res = super(account_invoice_line, self).fields_get(cr, uid, fields, context)
for field in res:
    if states.has_key(field):
        for key,value in states[field].items():
            res[field].setdefault('states',{})
            res[field]['states'][key] = value
return res

它使用父类(super class)的方法，它的工作原理是这样的:

fields_get() 使用 fields 参数返回模块中存在的字段。 您的模块只是强制每个字段的状态参数。

最后，它允许根据虚拟状态字段显示字段。在你的例子中:

• 如果一行处于“文章”状态，则默认显示，
• 如果一行处于“标题”状态，则显示为不可见且只读。

我认为这些状态值在这里是为了判断一行是标题、文章还是其他。

因此，如果您想在自己的模块中执行相同的操作，请复制/粘贴此 fields_get() 函数定义，自定义您的文章和状态变量，并且不要忘记在需要时进行调整, _columns 类属性上的状态字段定义。

希望对你有帮助

现在