پرو جنگو (صدای کارشناسان در توسعه وب)

Learn how to leverage Django, the leading Python web application development framework, to its full potential in this advanced tutorial and reference. Updated for Django 1.5 and Python 3, Pro Django, Second Edition examines in great detail the complex problems that Python web application developers can face and how to solve them. It provides inOCodepth information about advanced tools and techniques available in every Django installation, running the gamut from the theory of DjangoOCOs internal operations to actual code that solves realOCoworld problems for highOCovolume environments.Pro Django, Second Edition goes above and beyond other books, leaving the basics far behind and showing how Django can do things even its core developers never expected. By drawing on the dynamic nature of Python, you can write Django applications that stretch the limits of what you thought possible!" Contents at a Glance......Page 3 Contents......Page 277 About the Author......Page 287 About the Technical Reviewers......Page 288 Acknowledgments......Page 289 Preface......Page 290 Introduction......Page 4 Philosophy......Page 6 Django’s Interpretation of the MVC Pattern......Page 7 Template......Page 8 Don’t Repeat Yourself (DRY)......Page 9 Failing Loudly......Page 10 Community......Page 12 Management of the Framework......Page 13 Read the Documentation......Page 14 Now What?......Page 15 How Python Builds Classes......Page 16 Building a Class Programmatically......Page 17 Metaclasses Change It Up......Page 18 Declarative Syntax......Page 19 Attribute Classes......Page 20 Class Declaration......Page 21 __call__(self[, ...])......Page 22 __setitem__(self, key, value)......Page 23 close(self)......Page 24 __iter__(self)......Page 25 next(self)......Page 26 Sequences......Page 27 Excess Arguments......Page 28 Mixing Argument Types......Page 29 Decorators......Page 30 Decorating with Extra Arguments......Page 31 Back to the Decorator Problem......Page 32 A Decorator with or without Arguments......Page 34 Descriptors......Page 36 Keeping Track of Instance Data......Page 37 Common Class and Function Attributes......Page 38 Getting Arbitrary Object Types......Page 39 Function Signatures......Page 40 Docstrings......Page 41 Tracking Subclasses......Page 42 A Simple Plugin Architecture......Page 43 Now What?......Page 45 How Django Processes Model Classes......Page 46 Getting Information About Models......Page 47 Class Information......Page 48 Field Definitions......Page 49 Configuration Options......Page 50 Retrieving All Applications......Page 52 Retrieving a Single Application......Page 53 Dealing with Individual Models......Page 54 Common Field Attributes......Page 56 Common Field Methods......Page 59 Performing Actions During Model Registration......Page 61 contribute_to_class(self, cls, name)......Page 62 get_internal_type(self)......Page 63 to_python(self, value)......Page 64 Supporting Complex Types with SubfieldBase......Page 65 db_type(self, connection)......Page 66 get_db_prep_value(self, value, connection, prepared=False)......Page 67 get_prep_lookup(self, lookup_type, value)......Page 68 get_db_prep_lookup(self, lookup_type, value, connection, prepared=False)......Page 69 get_filename(self, filename)......Page 70 delete_file(self, instance, sender)......Page 71 Customizing the File Class......Page 72 save(self, name, content, save=True)......Page 73 class_prepared......Page 74 pre_init and post_init......Page 75 pre_save and post_save......Page 76 pre_delete and post_delete......Page 77 post_syncdb......Page 78 Loading Attributes on Demand......Page 79 Pickling and Unpickling Data......Page 80 Unpickling on Demand......Page 82 Putting It All Together......Page 83 A First Pass......Page 84 Now What?......Page 86 URLs......Page 87 The patterns() Function......Page 88 Resolving URLs to Views......Page 90 The permalink Decorator......Page 91 The reverse( ) Utility Function......Page 92 Templates Break It Up a Bit......Page 93 Writing Views to Be Generic......Page 94 Use Lots of Arguments......Page 95 View Decorators......Page 96 Applying View Decorators......Page 97 Writing a View Decorator......Page 98 Class-Based Views......Page 101 __init__(self, **kwargs)......Page 102 as_view(cls, **initkwargs)......Page 103 Individual View Methods......Page 104 Decorating View Methods......Page 105 Cross-Origin Resource Sharing (CORS)......Page 106 CORS Decorator......Page 107 CORS Mixin......Page 108 Providing Both a Decorator and a Mixin......Page 109 Now What?......Page 110 Declaring and Identifying Fields......Page 111 Binding to User Input......Page 112 Validating Input......Page 113 Using Class-Based Views......Page 114 Validation......Page 117 Controlling Widgets......Page 118 Rendering HTML......Page 119 Splitting Data Across Multiple Widgets......Page 120 Customizing Form Markup......Page 122 Accessing Individual Fields......Page 123 Pending and Resuming Forms......Page 124 Storing Values for Later......Page 125 Reconstituting a Form......Page 127 A Full Workflow......Page 128 Making It Generic......Page 129 A Class-Based Approach......Page 130 Now What?......Page 133 What Makes a Template......Page 134 Exceptions......Page 135 Content Tokens......Page 136 Parsing Tokens into Nodes......Page 137 Context......Page 138 Simple Variable Resolution......Page 139 Complex Variable Lookup......Page 140 django.template.loader.get_template(template_name)......Page 141 render_to_string(template_name, dictionary=None, context_instance=None)......Page 142 Setting Up the Package......Page 143 Accepting a Value......Page 144 Template Tags......Page 145 A Simple Tag......Page 146 Embedding Another Template Engine......Page 147 Converting a Token to a String......Page 148 Compiling to a Node......Page 149 Preparing the Jinja Template......Page 150 Enabling User-Submitted Themes......Page 151 Setting Up the Models......Page 152 Supporting Site-Wide Themes......Page 154 Setting Up Templates to Use Themes......Page 155 Validating and Securing Themes......Page 156 An Example Theme......Page 158 Now What?......Page 159 HttpRequest.method......Page 160 “Safe” Methods......Page 161 HttpRequest.GET......Page 162 HttpRequest.META......Page 163 HttpRequest.get_full_path( )......Page 164 Creating a Response......Page 165 Dictionary Access to Headers......Page 166 HttpResponse.set_cookie(key, value=''[, ...])......Page 167 HttpResponse.cookies......Page 168 Specialty Response Objects......Page 169 MiddlewareClass.process_request(self, request)......Page 170 MiddlewareClass.process_exception(self, request, exception)......Page 171 Using Middleware As Decorators......Page 172 django.core.signals.request_started......Page 173 Signing Outgoing Response Cookies......Page 174 Validating Incoming Request Cookies......Page 175 Signing Cookies As a Decorator......Page 176 Now What?......Page 177 django.db.backends......Page 178 DatabaseWrapper.features......Page 179 DatabaseWrapper.ops......Page 182 Comparison Operators......Page 186 Creation of New Structures......Page 187 Introspection of Existing Structures......Page 189 get_user(user_id)......Page 190 Files......Page 191 The Base File Class......Page 192 Handling Uploads......Page 193 Storing Files......Page 194 Session Management......Page 196 Caching......Page 197 Using the Cache Manually......Page 198 Template Loading......Page 199 load_template(template_name, template_dirs=None)......Page 200 Scanning Incoming Files for Viruses......Page 201 Now What?......Page 202 ImproperlyConfigured......Page 203 ObjectDoesNotExist......Page 204 SuspiciousOperation......Page 205 ViewDoesNotExist......Page 206 get_text_list(items, last_word='or')......Page 207 phone2numeric(phone)......Page 208 smart_split(text)......Page 209 wrap(text, width)......Page 210 Truncator.chars(num, truncate='...')......Page 211 DictWrapper......Page 212 MergeDict......Page 213 MultiValueDict......Page 214 cached_property(func)......Page 215 curry(func)......Page 216 lazy(func, *resultclasses)......Page 217 allow_lazy(func, *resultclasses)......Page 218 lazy_property(fget=None, fset=None, fdel=None)......Page 219 memoize(func, cache, num_args)......Page 220 wraps(func)......Page 221 Signals......Page 222 Sending a Signal......Page 223 Registering Listeners......Page 224 Now What?......Page 225 contacts.models.Contact......Page 226 contacts.forms.UserEditorForm......Page 228 contacts.forms.ContactEditorForm......Page 229 contacts.views.EditContact......Page 230 URL Configuration......Page 233 Real Estate Properties......Page 236 properties.models.Property......Page 237 properties.models.Feature......Page 240 properties.models.InterestedParty......Page 241 Admin Configuration......Page 242 URL Configuration......Page 245 Now What?......Page 246 Adding an API......Page 247 Serializing Data......Page 248 Outputting a Single Object......Page 250 Handling Relationships......Page 251 Controlling Output Fields......Page 253 Many-to-Many Relationships......Page 256 Getting the Appropriate Fields......Page 258 Getting Information About the Relationship......Page 259 ResourceView......Page 262 ResourceListView......Page 263 ResourceDetailView......Page 265 Now What?......Page 266 Index......Page 267 Learn how to leverage Django, the leading Python web application development framework, to its full potential in this advanced tutorial and reference. Updated for Django 1.5 and Python 3, Pro Django, Second Edition examines in great detail the complex problems that Python web application developers can face and how to solve them. It provides in–depth information about advanced tools and techniques available in every Django installation, running the gamut from the theory of Django's internal operations to actual code that solves real–world problems for high–volume environments. Pro Django, Second Edition goes above and beyond other books, leaving the basics far behind and showing how Django can do things even its core developers never expected. By drawing on the dynamic nature of Python, you can write Django applications that stretch the limits of what you thought possible!