hide button Edit , Create on odoo xml - odoo

Question

I want to hide the edit and create button on the form view for a specific user I use this code but the button not showing at all
i just want to hide buttons just for only group
<record model="ir.ui.view" id="edit_button_message_">
<field name="name">edit.button.message.1</field>
<field name="model">person.message</field>
<field name="inherit_id" ref="view_parent_message_form"/>
<field name="groups_id" eval="[(6,0,[ref('person_access')])]"/>
<field name="arch" type="xml">
<xpath expr="/form[#string='form_view_string']" position="attributes">
<attribute name="create">false</attribute>
<attribute name="edit">false</attribute>
</xpath>
</field>
</record>
and i use this
<form string="form_view_string" edit="false" create="false" >
nothing happened , I use odoo v8

Answer 1

You better create a security access for that group to allow just read to that model, preventing the create, write and unlink actions and those buttons should disappear.
You could create it in xml as it will be only one, like:
<record id="person_message_access" model="ir.model.access">
<field name="name">edit.button.message.access</field>
<field name="model_id" ref="person.message"/>
<field name="group_id" ref="person_access"/>
<field name="perm_read" eval="1"/>
<field name="perm_create" eval="0"/>
<field name="perm_write" eval="0"/>
<field name="perm_unlink" eval="0"/>
</record>
or you could set it into a field ir.model.access.csv with content like:
id,name,model_id:id,group_id:id,perm_read,perm_write,perm_create,perm_unlink
person_message_access,edit.button.message.access,model_person_message,person_access,1,0,0,0