 
DMVCFramework is a very popular Delphi framework which provides an easy to use, scalable, flexible [RESTful](https://en.wikipedia.org/wiki/Representational_state_transfer), [JSON-RPC](https://en.wikipedia.org/wiki/JSON-RPC) and [ActiveRecord](https://www.martinfowler.com/eaaCatalog/activeRecord.html) framework for Delphi developers. DMVCFramework is the **most popular** Delphi project on GitHub and compiles for Windows (32 and 64bit) and Linux (64bit). DMVCFramework services can be compiled as console application, Windows Service, Linux daemon, Apache module (Windows and Linux) and IIS ISAPI (Windows).
The official guide for DMVCFramework is available. DMVCFramework has a lot functionalities and can really help your business. However many developers don't use it at its full potential. Why don't get more when is easily available? The DMVCFramework lead developer and project coordinator Daniele Teti, wrote the official guide for this great framework.
> While a huge work has been done by the author and the reviews to make the book and the examples well written, complete and effective, things can be always improved. For any suggestions, complains or requests there is the official Github book project (https://github.com/danieleteti/dmvcframeworktheofficialguide) where you can fill an issue and get in touch directly with the author.
*It is not needed to download the git repository*. Just download the [latest version as a zip file](https://github.com/danieleteti/delphimvcframework/releases/latest) and you are ok.
If you want to participate to the testing phase (which usually contains brand new features) you can get the [latest Release Candidate version](https://github.com/danieleteti/delphimvcframework/releases).
> We started the process of migrating our systems to micro services and are loving the DMVCFramework "DMVCFramework is definitely part of our lives right now". -- E. Costa
* DMVCFramwork is simple to use, has a [lot of examples](https://github.com/danieleteti/delphimvcframework/tree/master/samples), is documented and there are a [lot of tutorials](https://www.youtube.com/results?search_query=delphimvcframework) available.
* A new book is being written by Daniele Teti. Let us know if you are interested in [DMVCFramework Handbook](https://leanpub.com/delphimvcframework))
* JSON-RPC 2.0 Support with automatic objects remotization (check [sample](https://github.com/danieleteti/delphimvcframework/tree/master/samples/jsonrpc_with_published_objects))
* DMVCFramework' MVCActiveRecord allows an easy and fast database access.
* Stable and solid, used by small/mid/big projects since 2010
* Very fast! (2.x was pretty fast and now, 3.x is 60% faster than the 2.x!)
* Support group at https://www.facebook.com/groups/delphimvcframework with more than 2700 active members
* Can be used in load balanced environment
* Wizard for the Delphi IDE. It makes DelphiMVCFramework even more simple to use!
* Optional session support
* JSON Web Token Support (JWT) (check [sample](https://github.com/danieleteti/delphimvcframework/tree/master/samples/jsonwebtoken))
* Extendable using middleware - simple hooks to handle request/response (check [sample](https://github.com/danieleteti/delphimvcframework/tree/master/samples/middleware))
* Flexible yet simple to use, authorization/authentication framework based on industry standards.
* Controllers inheritance! You can define your own base controller and inherit from it.
* Fancy URL with parameter mappings
* Specialized renders to generate text, HTML, JSON.
* Powerful and customizable mapper to serialize/deserialize data.
* Can be packaged as stand alone server, apache module (XE6 or better) and ISAPI dll
* Integrated REST Client
* Works on Linux (Delphi 10.2 Tokyo or better)
* Completely unit tested (more than 170 unit tests)
* There is a sample for each functionality (check the [dmvcframework_(yourversion)_samples.zip](https://github.com/danieleteti/delphimvcframework/releases))
* Server side generated pages using [Mustache for Delphi](https://github.com/synopse/dmustache) or [TemplatePro](https://github.com/danieleteti/templatepro)
* Specific trainings are available (email to `professionals@bittime.it` for a date and a place)
* Push notifications support using [ServerSentEvents](https://github.com/danieleteti/delphimvcframework/tree/master/samples/serversentevents)
* Automatic documentation through `/system/describeserver.info`
* Driven by its huge community (Facebook group https://www.facebook.com/groups/delphimvcframework)
* Semantic Versioning
* Simple and [documented](docs/ITDevCON%202013%20-%20Introduction%20to%20DelphiMVCFramework.pdf)
* Continuously tested for Delphi versions incompatibilities by the proud [compatibility maintainers](COMPATIBILITY_MANTAINERS.MD)
## Overview of DelphiMVCFramework 3.2.0-boron
> More detailed info about DMVCFramework 3.2.0-boron in the *Release Notes* Section
- New! Added `ncCamelCase` and `ncPascalCase` to the available attribute formatters.
- New! Added Swagger support
- New! Attribute `MVCDoNotDeserialize`. If marked with this RTTI attribute, a property or a field is not deserialized and its value remain the same as was before the object deserialization.
- New! **ObjectDict** function is the suggested way to render all the most common data types. It returns a `IMVCObjectDictionary` which is automatically rendered by the renders. Check the `renders.dproj` sample.
> ObjectDict is the suggested way to renders data. However, the other ones are still there and works as usual.
- New and improved! SQLGenerator and RQL compiler for PostgreSQL, SQLite, MSSQLServer, MySQL, MariaDB, Firebird and Interbase.
- New! *MVCNameAs* attribute has got a new parameter named `Fixed` (default: false). If `Fixed` is true, then the name is not processed by the `MVCNameCase` attribute assigned to the owner type.
- New! Optionally load system controllers (those who provide `/describeserver.info`, `/describeplatform.info` and `/serverconfig.info` system actions) setting `Config[TMVCConfigKey.LoadSystemControllers] := 'false';` in the configuration block.
- Improved! Now the router consider `Accept:*/*` compatible for every `MVCProduces` values
- Improved! Greatly improved support for [HATEOAS](https://en.wikipedia.org/wiki/HATEOAS) in renders. Check `TRenderSampleController.GetPeople_AsObjectList_HATEOS` and all the others actions end with `HATEOS` in `renders.dproj` sample)
- New! `TMVCActiveRecord.Count` method (e.g. `TMVCActiveRecord.Count(TCustomer)` returns the number of records for the entity mapped by the class `TCustomer`)
- Change! `TMVCACtiveRecord.GetByPK<T>` raises an exception by default if the record is not found - optionally can returns `nil` using new parameter `RaiseExceptionIfNotFound`
- New! `contains` clause has been added in the RQL compiler for Firebird and Interbase
- New! Added support out operator in RQL parser. The RQL out operator is equivalent to the SQL NOT IN operator.
- New! `TMVCAnalyticsMiddleware` to do automatic analytics on the API (generates a CSV file). Based on an idea by Nirav Kaku (https://www.facebook.com/nirav.kaku). Check the sample in `\samples\middleware_analytics\`
- New! `TMVCActiveRecord.DeleteAll`, `TMVCActiveRecord.DeleteRQL` and `TMVCActiveRecord.Store` which automatically executes Insert or Update considering primary key value.
- New! `TMVCActiveRecord` allows to use table name and field name with spaces (currently supported only by the PostgreSQL compiler).
- New! `StrDict(array of string, array of string)` function allows to render a dictionary of strings in a really simple way. See the following action sample.
- New! Custom Exception Handling. Sample "custom_exception_handling" show how to use it.
- SSL Server support for `TMVCListener` (Thanks to [Sven Harazim](https://github.com/landrix))
- Improved! Datasets serialization speed improvement. In some case the performance [improves of 2 order of magnitude](https://github.com/danieleteti/delphimvcframework/issues/205#issuecomment-479513158). (Thanks to https://github.com/pedrooliveira01)
- New! Added `TMVCActiveRecord.Count<T>(RQL)` to count record based on RQL criteria.
- Better JWT Standard Compliance!
- New! `StrToJSONObject` function to safely parse a string into a JSON object.
- New! Serialization callback for custom `TDataSet` descendants serialization in `TMVCJsonDataObjectsSerializer`.
- Added de/serializing iterables (e.g. generic lists) support without `MVCListOf` attribute.
- New! Children objects lifecycle management in `TMVCActiveRecord` (methods `AddChildren` and `RemoveChildren`). Really useful to manage child objects such relations or derived properties and are safe in case of multiple addition of the same object as children.
- **Deprecated!** `TDataSetHolder` is deprecated! Use the shining new `ObjectDict(boolean)` instead.
- Added ability to serialize/deserialize types enumerated by an array of mapped values (Thanks to [João Antônio Duarte](https://github.com/joaoduarte19))
- In `MVCActiveRecord` attribute `MVCPrimaryKey` has been removed and merged with `MVCTableField`, so now `TMVCActiveRecordFieldOption` is a set of `foPrimaryKey`, `foAutoGenerated`, `foTransient` (check `activerecord_showcase.dproj` sample).
- Middleware `OnAfterControllerAction` are now invoked in the same order of `OnBeforeControllerAction` (previously were invoked in reversed order).
-`TMVCEngine` is no more responsible for static file serving. If you need static files used the new `TMVCStaticFilesMiddleware` (check the sample). As consequence `TMVCConfigKey.DocumentRoot`, `TMVCConfigKey.IndexDocument` and `TMVCConfigKey.FallbackResource` are no more available.
-`TMVCEngine.Config` property is now read-only. Can be changed only in the anonymous method injected in the constructor.
- Fixed! [issue376](https://github.com/danieleteti/delphimvcframework/issues/376) (Thanks to [João Antônio Duarte](https://github.com/joaoduarte19))
- Fixed! [issue379](https://github.com/danieleteti/delphimvcframework/issues/379) (Thanks to [João Antônio Duarte](https://github.com/joaoduarte19) and [Maincosi](https://github.com/maiconsi) for their work)
- Fixed! [issue386](https://github.com/danieleteti/delphimvcframework/issues/386) (Thanks to [Rafael Dipold](https://github.com/dipold))
- Fixed! Has been patched a serious security bug affecting deployment configurations which uses internal WebServer to serve static files (do not affect all Apache, IIS or proxied deployments). Thanks to **Stephan Munz** to have discovered it. *Update to dmvcframework-3.2-RC5+ is required for all such kind of deployments.*
- When a JSON-RPC Request returns a `System.Boolean` the `result` will be a JSON `true` or `false` and no `1` or `0` as it was in the `3.2.0-boron`.
-`IMVCJSONRPCExecutor.ExecuteNotification` returns a `IJSONRPCResponse`. In case of error response contains information about the error, in case of successful execution the response is a [Null Object](https://en.wikipedia.org/wiki/Null_object_pattern).
- Added method `MetadataAsJSONObject(FieldNameCase: TMVCNameCase = ncLowerCase): TJSONObject;` in `TDataSetHelper`. This method returns the dataset field definitions. While this is valid only for Delphi datasets, can be useful to describe a dataset to a Delphi client.
```json
{
"fielddefs": [
{
"datatype": 3,
"displayname": "ID",
"fieldname": "id",
"precision": 0,
"size": 0
},
{
"datatype": 24,
"displayname": "CODE",
"fieldname": "code",
"precision": 0,
"size": 5
},
{
"datatype": 24,
"displayname": "DESCRIPTION",
"fieldname": "description",
"precision": 0,
"size": 200
},
{
"datatype": 37,
"displayname": "PRICE",
"fieldname": "price",
"precision": 18,
"size": 2
}
]
}
```
The static method `class procedure TFireDACUtils.CreateDatasetFromMetadata(
AFDMemTable: TFDMemTable; AMeta: TJSONObject);` gets the previous structure and initialize the fields of `AFDMemTable` with it. When a TFDMemTable is initialized using this approach, the data can be directly loaded from a jsonarray of jsonobject with the same field names. *WARNING: This mechanism works only for Delphi clients*. Check sample `articles_crud_vcl_client_meta.dproj` to understand the involved mechanisms.
- Added `foReadOnly` and `foWriteOnly` as field options in `MVCTableField` attribute (used by `TMVCActiveRecord`). Currently available field options are:
- *foPrimaryKey* { it's the primary key of the mapped table }
- *foAutoGenerated* { not written, read - similar to foReadOnly but is reloaded after insert and update }
- *foTransient* { never stored nor read - managed only at run-time }
- *foReadOnly* { not written, read }
- *foWriteOnly* { written, not read }
Now it is possible to declare entities like the followings (or with any other combinations):
- Added the ability to deserialize an object, or alist of objects, starting from an arbitrary node in the JSON (or other format) present in the request body. Works for `BodyAs<T>` and for `BodyAsListOf<T>` (Thanks to [Raphaël Emourgeon](https://github.com/osaris) for the `BodyAsListOf<T>` [implementation](https://github.com/danieleteti/delphimvcframework/issues/415)).
- Added property `Context.HostingFrameworkType`. This property is of type `TMVCHostingFrameworkType` and can assume one of the following values: `hftIndy` (if the service is using the built-in Indy HTTP server) , `hftApache` (if the project is compiled as Apache module) or `hftISAPI` (if the project is compiled as ISAPI module).
-`TMVCNameCase` got the new `ncSnakeCase` among the possibles casing (thanks to [João Antônio Duarte](https://github.com/joaoduarte19) for its work in this area).
Now the `TMVCNameCase` declaration is the following:
- **Breaking Change**! `TMVCStaticFileMiddleware` cannot be registered to "/" anymore
- The suggested solution is to create a simple redirection controller which redirect "/" to the proper path (check [this example](https://github.com/danieleteti/delphimvcframework/blob/master/samples/middleware_staticfiles/SPARedirectController.pas)).
- **Breaking Change!** `DocumentRoot` of `TMVCStaticFileMiddleware` must be a valid folder. If `DocumentRoot` doesn't exist an exception is raised.
- Fix for [issue435](https://github.com/danieleteti/delphimvcframework/issues/435) (Thanks to [sonjli](https://github.com/sonjli) for its initial work)
- Fix for [issue434](https://github.com/danieleteti/delphimvcframework/issues/434) (Thanks to [David Moorhouse](https://github.com/fastbike) for his detailed analysis)
- Fix for [issue430](https://github.com/danieleteti/delphimvcframework/issues/430) (Thanks to [sonjli](https://github.com/sonjli) for its initial work)
- Support for [Mustache](https://mustache.github.io/) partials (Thanks to [David Moorhouse](https://github.com/fastbike) and his work about [issue 221](https://github.com/danieleteti/delphimvcframework/issues/221)). Sample *\samples\serversideviews_mustache* has been updated to show how to use partials.
- Added dynamic properties access to `TMVCActiveRecord` descendants. Indexed property `Attributes` is index using the property name and set/get a `TValue` representing the property value.
DelphiMVCFramework roadmap is always updated as-soon-as the features planned are implemented. Check the roadmap [here](roadmap.md).
## Trainings, consultancy or custom development service
As you know, good support on open source software is a must for professional users.
If you need trainings, consultancy or custom developments on DelphiMVCFramework, send an email to *dmvcframework at bittime dot it*. Alternatively you can send a request using the [contacts forms](http://www.bittimeprofessionals.it/contatti) on [bit Time Professionals website](http://www.bittimeprofessionals.it). bit Time Professionals is the company behind DelphiMVCFramework, all the main developers works there.
## Release Notes
### 3.2.0 (boron)
- New! Support for Delphi 10.4 Sydney!
- New! Added Nullable support in MVCActiveRecord (nullables defined in `MVCFramework.Nullables.pas`)! Check *activerecord_showcase* sample.
- New! Added non autogenerated primary keys in MVCActiveRecord! Check *activerecord_showcase* sample.
- New! Attribute `MVCDoNotDeserialize`. If marked with this RTTI attribute, a property or a field is not deserialized and its value remain the same as was before the object deserialization.
- New! **ObjectDict** function is the suggested way to render all the most common data types. It returns a `IMVCObjectDictionary` which is automatically rendered by the renders. Check the `renders.dproj` sample. Here's some example of the shining new `ObjectDict()`.
`ObjectDict` is able to render multiple data sources (datasets, objectlists, objects or StrDict) at the same time using different casing, HATEOAS callbacks and modes.
- New! *MVCNameAs* attribute got the param `Fixed` (default: false). If `Fixed` is true, then the name is not processed by the `MVCNameCase` attribute assigned to the owner type.
- New! Added support for interfaces serialization - now it is possible to serialize Spring4D collections (thanks to [João Antônio Duarte](https://github.com/joaoduarte19))
- New! Added support for rendering Spring4D Nullable Types - (thanks to [João Antônio Duarte](https://github.com/joaoduarte19))
- New! Added `OnRouterLog` event to log custom information for each request (thanks to [Andrea Ciotti](https://github.com/andreaciotti) for the first implementation and its PR)
- New! Optionally load system controllers (those who provide `/describeserver.info`, `/describeplatform.info` and `/serverconfig.info` system actions) setting `Config[TMVCConfigKey.LoadSystemControllers] := 'false';` in the configuration block.
- Improved! Now the router consider `Accept:*/*` compatible for every `MVCProduces` values.
- Improved! Greatly improved support for [HATEOAS](https://en.wikipedia.org/wiki/HATEOAS) in renders. Check `TRenderSampleController.GetPeople_AsObjectList_HATEOS` and all the others actions end with `HATEOS` in `renders.dproj` sample).
- New! `TMVCActiveRecord.Count` method (e.g. `TMVCActiveRecord.Count(TCustomer)` returns the number of records for the entity mapped by the class `TCustomer`)
- Change! `TMVCACtiveRecord.GetByPK<T>` raises an exception by default if the record is not found - optionally can returns `nil` using new parameter `RaiseExceptionIfNotFound`
- New! `TMVCAnalyticsMiddleware` to do automatic analytics on the API (generates a CSV file). Based on an idea by Nirav Kaku (https://www.facebook.com/nirav.kaku). Check the sample in `\samples\middleware_analytics\`
- New! Microsoft SQLServer Support in `MVCActiveRecord` and RQL (*thanks to one of the biggest Delphi based company in Italy which heavily uses DMVCFramework* and *[DMSContainer](http://www.bittimeprofessionals.it/prodotti/dmscontainer)*).
- Improved! All `ActiveRecord` methods which retrieve records can now specify the data type of each parameter (using Delphi's `TFieldType` enumeration).
- Improved! In case of unhandled exception `TMVCEngine` is compliant with the default response content-type (usually it did would reply using `text/plain`).
- Added! New overloads for all the Log\* calls. Now it is possible to call `LogD(lMyObject)` to get logged `lMyObject` as JSON (custom type serializers not supported in log).
- New! `StrDict(array of string, array of string)` function allows to render a dictionary of strings in a really simple way. See the following action sample.
```delphi
procedure TMy.GetPeople(const Value: Integer);
begin
if Value mod 2 <> 0 then
begin
raise EMVCException.Create(HTTP_STATUS.NotAcceptable, 'We don''t like odd numbers');
end;
Render(
StrDict(
['id', 'message'],
['123', 'We like even numbers, thank you for your ' + Value.ToString]
- New! Custom Exception Handling (Based on work of [David Moorhouse](https://github.com/fastbike)). Sample *custom_exception_handling* show how to use it.
- SSL Server support for `TMVCListener` (Thanks to [Sven Harazim](https://github.com/landrix)).
- Improved! Datasets serialization speed improvement. In some case the performance [improves of 2 order of magnitude](https://github.com/danieleteti/delphimvcframework/issues/205#issuecomment-479513158). (Thanks to https://github.com/pedrooliveira01).
- New! Added `in` operator in RQL parser (Thank you to [João Antônio Duarte](https://github.com/joaoduarte19) for his initial work on this).
- Added new method in the dataset helper to load data into a dataset from a specific JSONArray property of a JSONObject `procedure TDataSetHelper.LoadJSONArrayFromJSONObjectProperty(const AJSONObjectString: string; const aPropertyName: String);`
- New! Added support for `TArray<String>`, `TArray<Integer>` and `TArray<Double>` in default JSON serializer (Thank you [Pedro Oliveira](https://github.com/pedrooliveira01))
- Improved JWT Standard Compliance! Thanks to [Vinicius Sanchez](https://github.com/viniciussanchez) for his work on [issue #241](https://github.com/danieleteti/delphimvcframework/issues/241)
- Added de/serializing iterables (e.g. generic lists) support without `MVCListOf` attribute (Thank you to [João Antônio Duarte](https://github.com/joaoduarte19)).
- New! The **MVCAREntitiesGenerator** can optionally register all the generated entities also in the `ActiveRecordMappingRegistry` (Thanks to [Fabrizio Bitti](https://twitter.com/fabriziobitti) from [bit Time Software](http://www.bittime.it))
- New! Children objects lifecycle management in `TMVCActiveRecord` (methods `AddChildren` and `RemoveChildren`). Really useful to manage child objects such relations or derived properties and are safe in case of multiple addition of the same object as children.
- Added ability to serialize/deserialize types enumerated by an array of mapped values (Thanks to [João Antônio Duarte](https://github.com/joaoduarte19)).
- In `MVCActiveRecord` attribute `MVCPrimaryKey` has been removed and merged with `MVCTableField`, so now `TMVCActiveRecordFieldOption` is a set of `foPrimaryKey`, `foAutoGenerated`, `foTransient` (check `activerecord_showcase.dproj` sample).
- Middleware `OnAfterControllerAction` are now invoked in the same order of `OnBeforeControllerAction` (previously were invoked in reversed order).
-`TMVCEngine` is no more responsible for static file serving. If you need static files used the new `TMVCStaticFilesMiddleware` (check the sample). As consequence `TMVCConfigKey.DocumentRoot`, `TMVCConfigKey.IndexDocument` and `TMVCConfigKey.FallbackResource` are no more available.
-`TMVCEngine.Config` property is now read-only. Can be changed only in the anonymous method injected in the constructor.
- Fixed! [issue379](https://github.com/danieleteti/delphimvcframework/issues/379) (Thanks to [João Antônio Duarte](https://github.com/joaoduarte19) and [Maincosi](https://github.com/maiconsi) for their work)
- Fixed! Has been patched a serious security bug affecting deployment configurations which uses internal WebServer to serve static files (do not affect all Apache, IIS or proxied deployments). Thanks to **Stephan Munz** to have discovered it. *Update to dmvcframework-3.2-RC5+ is required for all such kind of deployments.*
- DMVCFramework *must* be installed using the [Github release](https://github.com/danieleteti/delphimvcframework/releases/tag/v3_2_0_boron). Download the zip file
- Now, DMVCFramework expert is installed and you are able to create DMVCFramework project. Go to go to `File->New->Other` select `Delphi Project->DMVC->DelphiMVCFramework Project`
- From the resultant dialog, leave all the default settings and click `OK`
- If you try to compile the project now, you will get compiler errors because we've to configure the library paths to let the compiler finds the needed source files
- go to `Tools->Options->Language->Delphi->Library` and add in the `Library Path` the following paths:
- C:\DMVC\sources
- C:\DMVC\lib\dmustache
- C:\DMVC\lib\loggerpro
- C:\DMVC\lib\swagdoc\Source
- Run the project (F9)
- Now, a new console application is running serving you first DMVCFramework server.
- Simple, isn't it?
- The wizard generated controller shown some basic setup and some actions. You can start from here to create your application. Use the huge number of sample to understand how each DMVCFramwork feature work.
If you don't plan to deploy your DMVCFramework server behind a webserver (apache or IIS) you can also pack more than one listener application server into one single executable. In this case, the process is a bit different and involves the creation of a listener context. However, create a new server is a simple task:
Resource Query Language (RQL) is a query language designed for use in URIs with object style data structures. DMVCFramework supports RQL natively and the included MVCActiveRecord micro-framework, implement a large subset of the RQL specs.
RQL can be thought as basically a set of nestable named operators which each have a set of arguments. RQL is designed to have an extremely simple, but extensible grammar that can be written in a URL friendly query string. A simple RQL query with a single operator that indicates a search for any resources with a property of "foo" that has value of 5 could be written:
```SPARQL
eq(foo,5)
```
A more complex filter can include an arbitrary number of chained functions
limit(count,start,maxCount) - Returns the given range of objects from the result set
contains(<property>,<value|expression>) - Filters for objects where the specified property's value is an array and the array contains any value that equals the provided value or satisfies the provided expression.
in(<property>,<array-of-values>) - Filters for objects where the specified property's value is in the provided array
out(<property>,<array-of-values>) - Filters for objects where the specified property's value is not in the provided array
```
##### Not Yet Availables
```
select(<property>,<property>,...) - Trims each object down to the set of properties defined in the arguments
values(<property>) - Returns an array of the given property value for each object
aggregate(<property|function>,...) - Aggregates the array, grouping by objects that are distinct for the provided properties, and then reduces the remaining other property values using the provided functions
distinct() - Returns a result set with duplicates removed
excludes(<property>,<value|expression>) - Filters for objects where the specified property's value is an array and the array does not contain any of value that equals the provided value or satisfies the provided expression.
rel(<relationname?>,<query>) - Applies the provided query against the linked data of the provided relation name.
sum(<property?>) - Finds the sum of every value in the array or if the property argument is provided, returns the sum of the value of property for every object in the array
mean(<property?>) - Finds the mean of every value in the array or if the property argument is provided, returns the mean of the value of property for every object in the array
max(<property?>) - Finds the maximum of every value in the array or if the property argument is provided, returns the maximum of the value of property for every object in the array
min(<property?>) - Finds the minimum of every value in the array or if the property argument is provided, returns the minimum of the value of property for every object in the array
recurse(<property?>) - Recursively searches, looking in children of the object as objects in arrays in the given property value
first() - Returns the first record of the query's result set
one() - Returns the first and only record of the query's result set, or produces an error if the query's result set has more or less than one record in it.
count() - Returns the count of the number of records in the query's result set
