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xmlcontext
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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}"
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Hilar Andikkadavath
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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}"


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Sehrish
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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

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