Passing Context Between Views & Actions in Odoo (Explained Simply)

If you’ve worked with Odoo for a while, you’ve probably seen the word “context” everywhere… but never fully understood what’s really happening behind the scenes.

The truth is:

Context is one of the most powerful features in Odoo.

It quietly passes data between:

• Actions
• Views
• Wizards
• Buttons
• Models
• One2many forms

And once you understand it properly, your development becomes cleaner, smarter, and much faster.

So… What Exactly is Context?

In simple terms:

Context is just a Python dictionary that carries extra information.

Example:

{
   'default_partner_id': 7,
   'search_default_customer': 1,
   'active_id': 45,
   'active_model': 'sale.order'
}

Think of it like a hidden messenger that tells Odoo:

• “Hey, pre-fill this value”
• “Apply this filter”
• “This is the record the user clicked”
• “Behave differently in this situation”

Where Does Context Actually Work?

Almost everywhere.

Context flows through:

• Window actions (ir.actions.act_window)
• Buttons & smart buttons
• Wizards
• One2many popups
• Server actions

Basically, whenever something opens, changes, or triggers — context is involved.

The Most Common Use Case: Default Values

This is where most developers first notice context.

Example: Passing data to a wizard

def action_open_wizard(self):
   return {
       'type': 'ir.actions.act_window',
       'name': 'Create Followup',
       'res_model': 'followup.wizard',
       'view_mode': 'form',
       'target': 'new',
       'context': {
           'default_partner_id': self.partner_id.id,
           'default_sale_id': self.id,
       }
   }

Why default_?

Because Odoo does this automatically:

👉 default_partner_id → partner_id

So you don’t need extra code. It just works.

The Magic Trio: active_id, active_ids, active_model

Whenever you open something from a record, Odoo automatically passes:

{
   'active_id': 12,
   'active_ids': [12],
   'active_model': 'sale.order'
}

This is extremely useful.

Example:

@api.model
def default_get(self, fields):
   res = super().default_get(fields)
   if self.env.context.get('active_id'):
       sale = self.env['sale.order'].browse(self.env.context['active_id'])
       res['partner_id'] = sale.partner_id.id
   return res

Now your wizard knows where it came from.

You Can Even Use Context in XML

Not everything needs Python.

Smart button example:

<button name="action_open_invoice"
       type="action"
       context="{'default_partner_id': partner_id}"/>

One2many example:

<field name="order_line"
      context="{'default_order_id': id}"/>

👉 Result: fields get auto-filled without extra logic.

Auto-Applying Filters (Very Useful!)

Context can activate filters automatically.

<field name="context">
   {'search_default_customer': 1}
</field>

If a filter exists:

<filter name="customer"
       domain="[('customer_rank', '>', 0)]"/>

👉 That filter is applied by default.

Changing Behavior Using Context

You can also control logic dynamically.

self.with_context(skip_validation=True).action_confirm()

Then inside your method:

if self.env.context.get('skip_validation'):
   return

👉 Clean way to tweak behavior without breaking core logic.

Important Tip: Don’t Break Existing Context

This is a common mistake.

❌ Wrong:

'context': {'default_partner_id': self.partner_id.id}

✔ Correct:

'context': dict(self.env.context, default_partner_id=self.partner_id.id)

Always merge, don’t overwrite.

When Should You Use Context?

Use it when:

• Opening wizards
• Passing data between models
• Setting default values
• Applying filters
• Temporarily changing behavior

Avoid it when:

• Storing permanent data
• Passing large datasets
• Replacing actual fields

Real-Life Example (You’ve Already Used This!)

When you create an invoice from a Sales Order:

Odoo already uses context to pass:

• Customer
• Company
• Currency
• Fiscal position

That’s why everything is auto-filled.

Context might feel confusing at first…

But once you “get it”, everything clicks.

You’ll start to:

• Write less code
• Build smarter features
• Create better user experiences

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