[NEW] Add budget model funcitonnalities

User is able to generate budget model and model lines
User can reset a budget and generate one using an existing model

account_budget_forecast/wizard/__init__.py

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+# -*- coding: utf-8 -*-
+
+from . import budget_forecast_model_choice

account_budget_forecast/wizard/budget_forecast_model_choice.py

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+# -*- coding: utf-8 -*-
+import logging
+
+from bdb import set_trace
+from odoo import models, fields, _
+
+_logger = logging.getLogger(__name__)
+
+
+class BudgetForecastModelChoice(models.Model):
+    _name = "budget.forecast.model.choice"
+    _description = _name
+
+    budget_forecast_model = fields.Many2one("budget.forecast.model")
+
+    def create_budget_forecast_lines(self):
+        analytic_account = self.env["account.analytic.account"].browse(
+            self._context.get("active_ids")
+        )
+        # Budget line deletion must be done in a precise order to avoid trying to unlink already deleted lines.
+        # 1. Delete summary lines to remove all the linked section and subsection lines
+        for line in analytic_account.budget_forecast_ids.filtered(
+            lambda r: r.is_summary
+        ):
+            _logger.debug("SUMMARY BUDGET LINE = %s", line.name)
+            line.unlink()
+
+        # 2. Delete article and note lines
+        for line in analytic_account.budget_forecast_ids.filtered(
+            lambda r: r.display_type in ["line_article", "line_note"]
+        ):
+            _logger.debug("OTHER BUDGET LINE = %s", line.name)
+            line.unlink()
+
+        if self.budget_forecast_model:
+            # Create new summary lines
+            section_model_lines = self.env["budget.forecast.model.line"].search(
+                [
+                    ("budget_model", "=", self.budget_forecast_model.id),
+                    ("display_type", "=", "line_section"),
+                ]
+            )
+            sequence = 0
+            for section in section_model_lines:
+                vals = {
+                    "analytic_id": self.env["account.analytic.account"]
+                    .browse(self._context.get("active_ids"))
+                    .id,
+                    "display_type": "line_section",
+                    "product_id": section.product_id.id,
+                    "description": section.name,
+                    "is_summary": True,
+                    "sequence": sequence,
+                }
+                section_line = self.env["budget.forecast"].create(vals)
+                sequence += 1
+                if section.child_ids:
+                    for sub_section in section.child_ids:
+                        vals = {
+                            "analytic_id": self.env["account.analytic.account"]
+                            .browse(self._context.get("active_ids"))
+                            .id,
+                            "display_type": "line_subsection",
+                            "product_id": sub_section.product_id.id,
+                            "description": sub_section.name,
+                            "is_summary": True,
+                            "parent_id": section_line.id,
+                            "sequence": sequence,
+                        }
+                        self.env["budget.forecast"].create(vals)
+                        sequence += 1

account_budget_forecast/wizard/budget_forecast_model_choice.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<odoo>
+
+    <record id="budget_forecast_model_wizard" model="ir.ui.view">
+        <field name="name">budget.forecast.model.wizard</field>
+        <field name="model">budget.forecast.model.choice</field>
+        <field name="arch" type="xml">
+            <form string="Reset : choose the Budget Forecast Model">
+                <div class="alert alert-warning">
+                    <span class="fa fa-info-circle" />
+                    Caution: all current budget lines will be deleted!
+                </div>
+                <group>
+                    <field name="budget_forecast_model" widget="selection" placeholder="Empty budget" />
+                </group>
+                <footer>
+                    <button string="Select" name="create_budget_forecast_lines" type="object" class="btn-primary" />
+                    <button string="Cancel" class="btn-secondary" special="cancel" />
+                </footer>
+            </form>
+        </field>
+    </record>
+
+    <record id="action_budget_forecast_model_choice" model="ir.actions.act_window">
+        <field name="name">Reset Budget</field>
+        <field name="res_model">budget.forecast.model.choice</field>
+        <field name="view_mode">form</field>
+        <field name="view_id" ref="budget_forecast_model_wizard" />
+        <field name="target">new</field>
+    </record>
+</odoo>