MongoEngine Integration

from flask_admin.contrib.mongoengine import ModelView

class ModelView(BaseModelView):
    def __init__(self, model, name=None, category=None, endpoint=None, url=None, **kwargs):
        """
        Initialize MongoEngine model view.
        
        Args:
            model: MongoEngine document class
            name (str, optional): View name for menu
            category (str, optional): Menu category
            endpoint (str, optional): Blueprint endpoint
            url (str, optional): URL prefix
            **kwargs: Additional view configuration
        """
    
    # MongoEngine-specific configuration
    subdocuments = {}                      # Embedded document configuration
    embedded_list_columns = []             # Columns for embedded lists
    
    # MongoDB querying
    def get_query(self):
        """
        Get base QuerySet for list view.
        
        Returns:
            QuerySet: MongoEngine QuerySet object
        """
    
    def get_list(self, page, sort_column, sort_desc, search, filters, execute=True, page_size=None):
        """
        Get paginated document list with sorting, searching, and filtering.
        
        Args:
            page (int): Page number (0-based)
            sort_column (str): Field to sort by
            sort_desc (bool): Sort in descending order
            search (str): Search query string
            filters (list): Active filter list
            execute (bool): Execute query immediately
            page_size (int, optional): Items per page
            
        Returns:
            tuple: (total_count, items) if execute=True, queryset if execute=False
        """
    
    def get_one(self, id):
        """
        Get single document instance by ObjectId.
        
        Args:
            id (str): Document ObjectId as string
            
        Returns:
            Document instance or None if not found
        """
    
    # CRUD operations for documents
    def create_model(self, form):
        """
        Create new document instance from form data.
        
        Args:
            form: Validated form instance
            
        Returns:
            bool: True if creation successful
        """
    
    def update_model(self, form, model):
        """
        Update existing document instance from form data.
        
        Args:
            form: Validated form instance
            model: Document instance to update
            
        Returns:
            bool: True if update successful
        """
    
    def delete_model(self, model):
        """
        Delete document instance.
        
        Args:
            model: Document instance to delete
            
        Returns:
            bool: True if deletion successful
        """
    
    # Form scaffolding for MongoEngine
    def scaffold_form(self):
        """
        Auto-generate form class from MongoEngine document.
        
        Returns:
            Form class with fields for document fields
        """
    
    def scaffold_list_form(self, widget=None, validators=None):
        """
        Generate form for inline list editing.
        
        Args:
            widget: Custom widget for fields
            validators: Custom validators
            
        Returns:
            Form class for inline editing
        """
    
    def scaffold_filters(self, name):
        """
        Generate filters for document field.
        
        Args:
            name (str): Field name
            
        Returns:
            list: Available filter types for field
        """
    
    # MongoDB-specific methods
    def get_pk_value(self, model):
        """
        Get primary key (ObjectId) from document instance.
        
        Args:
            model: Document instance
            
        Returns:
            str: ObjectId as string
        """
    
    def apply_search(self, query, search):
        """
        Apply text search filters to QuerySet.
        
        Args:
            query: Base QuerySet
            search (str): Search string
            
        Returns:
            QuerySet: QuerySet with search filters applied
        """
    
    def apply_filters(self, query, filters):
        """
        Apply field filters to QuerySet.
        
        Args:
            query: Base QuerySet
            filters (list): Active filters
            
        Returns:
            QuerySet: QuerySet with filters applied
        """
    
    def apply_sorting(self, query, sort_field, sort_desc):
        """
        Apply sorting to QuerySet.
        
        Args:
            query: Base QuerySet
            sort_field (str): Field to sort by
            sort_desc (bool): Sort descending
            
        Returns:
            QuerySet: Sorted QuerySet
        """

class EmbeddedForm:
    def __init__(
        self,
        form_base_class=None,
        form_columns=None,
        excluded_form_columns=None,
        form_args=None,
        form_widget_args=None,
        form_overrides=None
    ):
        """
        Initialize embedded document form configuration.
        
        Args:
            form_base_class: Base form class for embedded form
            form_columns (list, optional): Fields to include in embedded form
            excluded_form_columns (list, optional): Fields to exclude
            form_args (dict, optional): Form field arguments
            form_widget_args (dict, optional): Widget arguments
            form_overrides (dict, optional): Field type overrides
        """

from flask import Flask
from flask_mongoengine import MongoEngine
from flask_admin import Admin
from flask_admin.contrib.mongoengine import ModelView
from mongoengine import Document, EmbeddedDocument, fields
from datetime import datetime

app = Flask(__name__)
app.config['MONGODB_SETTINGS'] = {
    'db': 'blog',
    'host': 'localhost',
    'port': 27017
}
app.config['SECRET_KEY'] = 'secret-key'

db = MongoEngine(app)

# Define documents
class User(Document):
    username = fields.StringField(max_length=80, unique=True, required=True)
    email = fields.EmailField(required=True)
    created_at = fields.DateTimeField(default=datetime.utcnow)
    is_active = fields.BooleanField(default=True)
    profile = fields.EmbeddedDocumentField('UserProfile')

class UserProfile(EmbeddedDocument):
    first_name = fields.StringField(max_length=50)
    last_name = fields.StringField(max_length=50)
    bio = fields.StringField(max_length=500)
    avatar_url = fields.URLField()

class BlogPost(Document):
    title = fields.StringField(max_length=200, required=True)
    content = fields.StringField()
    author = fields.ReferenceField(User, required=True)
    tags = fields.ListField(fields.StringField(max_length=50))
    created_at = fields.DateTimeField(default=datetime.utcnow)
    published = fields.BooleanField(default=False)
    
    meta = {
        'indexes': ['title', 'author', 'created_at'],
        'ordering': ['-created_at']
    }

# Create admin views
class UserModelView(ModelView):
    list_columns = ['username', 'email', 'profile.first_name', 'profile.last_name', 'created_at', 'is_active']
    column_searchable_list = ['username', 'email', 'profile.first_name', 'profile.last_name']
    column_filters = ['is_active', 'created_at']
    
    form_subdocuments = {
        'profile': {
            'form_columns': ['first_name', 'last_name', 'bio', 'avatar_url']
        }
    }

class BlogPostModelView(ModelView):
    list_columns = ['title', 'author.username', 'created_at', 'published']
    column_searchable_list = ['title', 'content', 'author.username']
    column_filters = ['author', 'published', 'created_at', 'tags']
    
    form_columns = ['title', 'content', 'author', 'tags', 'published']

# Initialize admin
admin = Admin(app, name='Blog Admin')
admin.add_view(UserModelView(User, name='Users'))
admin.add_view(BlogPostModelView(BlogPost, name='Blog Posts'))

from flask_admin.contrib.mongoengine import EmbeddedForm

class Address(EmbeddedDocument):
    street = fields.StringField(max_length=200)
    city = fields.StringField(max_length=100)
    state = fields.StringField(max_length=50)
    zip_code = fields.StringField(max_length=20)
    country = fields.StringField(max_length=50, default='USA')

class ContactInfo(EmbeddedDocument):
    phone = fields.StringField(max_length=20)
    fax = fields.StringField(max_length=20)
    website = fields.URLField()

class Company(Document):
    name = fields.StringField(max_length=200, required=True)
    address = fields.EmbeddedDocumentField(Address)
    contact = fields.EmbeddedDocumentField(ContactInfo)
    employees = fields.ListField(fields.ReferenceField(User))
    founded = fields.DateTimeField()

class CompanyModelView(ModelView):
    # Configure embedded document forms
    form_subdocuments = {
        'address': {
            'form_columns': ['street', 'city', 'state', 'zip_code', 'country'],
            'form_args': {
                'country': {'default': 'USA'}
            }
        },
        'contact': {
            'form_columns': ['phone', 'website'],  # Exclude fax
            'form_widget_args': {
                'phone': {'placeholder': '+1-555-123-4567'},
                'website': {'placeholder': 'https://example.com'}
            }
        }
    }
    
    # Display embedded fields in list
    list_columns = ['name', 'address.city', 'address.state', 'contact.phone', 'founded']
    
    column_labels = {
        'address.city': 'City',
        'address.state': 'State',
        'contact.phone': 'Phone'
    }

admin.add_view(CompanyModelView(Company, name='Companies'))

from mongoengine import Q
from flask_admin.contrib.mongoengine.filters import FilterEqual, FilterLike, FilterInList

class AdvancedBlogPostView(ModelView):
    # Text search across multiple fields
    column_searchable_list = ['title', 'content', 'tags']
    
    # MongoDB-specific filters
    column_filters = [
        'author',
        'published',
        'created_at',
        FilterLike('title', 'Title Contains'),
        FilterEqual('author', 'Exact Author'),
        FilterInList('tags', 'Has Tags', options=[
            ('python', 'Python'),
            ('flask', 'Flask'), 
            ('mongodb', 'MongoDB')
        ])
    ]
    
    # Custom query with MongoDB aggregation
    def get_query(self):
        # Add complex filters using MongoEngine Q objects
        return BlogPost.objects.filter(
            Q(published=True) | Q(author=current_user.id)
        )
    
    # Custom search with regex
    def apply_search(self, query, search):
        if search:
            # MongoDB regex search (case-insensitive)
            search_filter = (
                Q(title__icontains=search) |
                Q(content__icontains=search) |
                Q(tags__in=[search])
            )
            query = query.filter(search_filter)
        return query
    
    # Custom column formatter for tags
    def _tags_formatter(view, context, model, name):
        if model.tags:
            return ', '.join(model.tags[:3])  # Show first 3 tags
        return ''
    
    column_formatters = {
        'tags': _tags_formatter
    }

class Product(EmbeddedDocument):
    name = fields.StringField(required=True)
    price = fields.DecimalField(min_value=0)
    sku = fields.StringField()

class Order(Document):
    order_number = fields.StringField(unique=True, required=True)
    customer_email = fields.EmailField(required=True)
    products = fields.ListField(fields.EmbeddedDocumentField(Product))
    shipping_address = fields.EmbeddedDocumentField(Address)
    order_date = fields.DateTimeField(default=datetime.utcnow)
    status = fields.StringField(
        choices=['pending', 'processing', 'shipped', 'delivered'],
        default='pending'
    )

class OrderModelView(ModelView):
    # Configure embedded list editing
    form_subdocuments = {
        'products': {
            'form_columns': ['name', 'price', 'sku'],
            'form_widget_args': {
                'price': {'step': '0.01', 'min': '0'}
            }
        },
        'shipping_address': {
            'form_columns': ['street', 'city', 'state', 'zip_code']
        }
    }
    
    list_columns = [
        'order_number', 
        'customer_email', 
        'products_count',
        'order_date', 
        'status'
    ]
    
    # Custom formatter for product count
    def _products_count_formatter(view, context, model, name):
        return len(model.products) if model.products else 0
    
    column_formatters = {
        'products_count': _products_count_formatter
    }
    
    column_labels = {
        'products_count': 'Items'
    }
    
    # Custom form processing
    def on_model_change(self, form, model, is_created):
        # Generate order number for new orders
        if is_created and not model.order_number:
            import uuid
            model.order_number = f'ORD-{uuid.uuid4().hex[:8].upper()}'

from mongoengine import FileField
from werkzeug.utils import secure_filename

class Document(Document):
    title = fields.StringField(required=True)
    description = fields.StringField()
    file = FileField()
    uploaded_at = fields.DateTimeField(default=datetime.utcnow)
    uploaded_by = fields.ReferenceField(User)

class DocumentModelView(ModelView):
    form_columns = ['title', 'description', 'file']
    list_columns = ['title', 'file.filename', 'uploaded_at', 'uploaded_by.username']
    
    column_labels = {
        'file.filename': 'Filename',
        'uploaded_by.username': 'Uploaded By'
    }
    
    # Custom file formatter
    def _file_formatter(view, context, model, name):
        if model.file:
            return Markup(f'<a href="/download/{model.id}">{model.file.filename}</a>')
        return ''
    
    column_formatters = {
        'file': _file_formatter
    }
    
    def on_model_change(self, form, model, is_created):
        # Set uploaded_by to current user
        if is_created:
            model.uploaded_by = current_user._get_current_object()

from flask_admin.actions import action
from flask import flash

class UserModelView(ModelView):
    @action('activate', 'Activate Users', 'Activate selected users?')
    def action_activate(self, ids):
        try:
            # Bulk update using MongoEngine
            count = User.objects(id__in=ids).update(set__is_active=True)
            flash(f'Successfully activated {count} users.', 'success')
        except Exception as ex:
            flash(f'Failed to activate users: {str(ex)}', 'error')
    
    @action('send_email', 'Send Welcome Email')
    def action_send_email(self, ids):
        try:
            users = User.objects(id__in=ids)
            for user in users:
                # Send email logic here
                send_welcome_email(user.email)
            flash(f'Sent emails to {len(users)} users.', 'success')
        except Exception as ex:
            flash(f'Failed to send emails: {str(ex)}', 'error')