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I have a context which get its value from the parent view but sometimes the parent view doesn't has this value so i got error while evaluating the value as it's not find in the context how to figure out if the value defined or not in the context. on XML
context="{'default_opportunity_id': default_opportunity_id}"
if opportunity_id is your field name try context="{'default_opportunity_id': opportunity_id}"
to fetch from the parent form use context="{'default_opportunity_id': parent.opportunity_id}"
or context="{'default_opportunity_id': parent.opportunity_id and parent.opportunity_id}"
After reading the article, answer of these questions help you to reflect upon and analyse what you have read.
1- What is context?
2- Why we need context?
3- How to use or define context in Odoo/OpenERP?
<field name="external_evaluation_ids" context="{'default_state':state}">
<tree>
<field name="state"/> <!--newly created field in one2many table-->
<field name="child_table_field1"/>
<field name="child_table_field2"/>
<field name="child_table_field2"/>
</tree>
</field>Read more about context in details: http://learnopenerp.blogspot.com/2018/01/get-parent-form-value-in-one2many-form.html
I think it may be helful
http://learnopenerp.blogspot.com/2018/01/get-parent-form-value-in-one2many-form.html
Thanks
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