How to hide the edit button form based on state field of invoice Odoo v8?

Question

I want to hide the edit button when a invoice\' state is paid, just like the image below.

Answer 1

You can do this by overriding load_record of FormView widget:

openerp.module_name = function(instance, local) {
    var instance = openerp;
    var FormView = instance.web.FormView;

    // override load_record
    FormView.include({
        load_record: function(record) {
        // disable only for purchase.order
        if (record){
            // allow this behavior only for purchase.order  
            if (this.model == 'purchase.order' & _.contains(['done', 'cancel'], record.state)){
                    $('button.oe_form_button_edit').hide()
                }else {
                    $('button.oe_form_button_edit').show()
                }
        }
        // call super
        return this._super(record);
        }
    });
}

Check this app if you looking for full code:

Disable edit button for paid invoice

Answer 2

Add a Record Rule for account.invoice object with Read permission alone. And a domain filter as [('state','=','paid')].

Answer 3

Try replacing fields through inheritance and adding attrs to it. Using attrs, you can set the field invisible when state is paid like this,

        <field name="edit" attrs="{'invisible':[('state', '=', 'paid')]}"/>