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Project Description
.. ViewModels documentation master README file.



ViewModels are wrappers for the data 'model', that include details of the data
useful in generating views. An ORM (
The current implementation is with mongoDB for
the bottle framework. Generally the concept is to allow information
and flexibly independent of the constraints of the underlying db. This provides
for the model and also supports the view code, so simplifies both model and view

- `Interface to provide access to database and abstraction`_.
- `Repository for all information relating to data: schema and beyond`_.
- `Increasing range of types available to applications`_.


- `History`_.
- `Data tables/collections and data views`_.

- `Simple Example`_.
- `Describing a table/collection with ViewFields`_.
- `Using 'ViewField' derived classes`_.
- `'ViewModel' interface`_.
- `Building HTML forms`_.
- `Updating from HTML forms`_.

`Data Relationships & Joins`_.

- `Many to one`_.
- `One to Many`_.
- `One of Many Selector`_.
- `Many to Many`_.

`How it works`_.
- `The rows Structure`_.
- `Relationship Specific Data`_.
- `Inserts and Joins`_.


Interface to provide access to database and abstraction

To access a collection in a simply Mongo through pymongo could not
be much simpler. Similarly with other
However this does not provide:
- abstraction between code and database
- types beyond those covered in the BSON type set
- joins, and joins with 'lazy' execution
- a record of schema in use
- support for a web maintenance interface to the database
- web interface supports security and templates for full application

All these advantages are provided by using ViewModel. However there are times
when none of these justifies an additional layer. The more complex the
collection, the greater the amount of code, generally the greater the value
of using ViewObject

Abstraction between code and database

Databases migrate. The Salt database started with direct SQL, then
SQLAlchemy, then mongodb. Abstraction assists with migrations as the
code is written to abstract API, leaving the application able to remain
unchanged during migration, and only intarnat interface to the new system
need change. Relatity, some changes also require a change of API, but even
in those cases, application changes are reduced.
The current Salt system uses Mongo and directly using the pymongo interface
is can be perfect for simple access. A rewrite would be needed to change
the db but the code is so small it is not a large barrier for small simple
cases. But more complex cases are another matter!

Repository for *all* information relating to data: schema and beyond

A single repository for all information about data. Information on both storage
as well as information used for display, all in one place.

Data descriptions can be simple tables/collections or views which comprise multiple
tables which are effectively joined.

The data description provided by viewmodel library, can include extended types
described at a layer of abstraction separate from the storage specification,
allowing the application layer free of the mechanics.

ViewModel was first created for SQL based applications, but then evolved to also
work with NoSQL mongoDB applications.

NoSql collections (or tables) can effectively be irregular with different
fields present potentially in every entry. While with SQL,just examining a
row can give a reasonable view of that schema, but this can be less clear
from NoSql. Even with SQL, the schema recorded is restricted to what the database
engine requires, and lacks richer descriptions of the data and rules not
implemented by the database, but a repository for a schema becomes even more
essential with NoSQL.

Increasing range of types available to applications

ViewModel provides mapping between the data in the database and the data
seen by the application. Far more descriptive types and move complex types
can be used by the application with the mapping between these types and
the underlying storage format handle by the ViewModel

- `History`_.
- `Data tables/collections and data views`_.


The original Salt project development worked with SQL at a time when
the SQLAlchemy project was still in early stages. So Salt developed its own
layer to abstract to the database in 2007 around the same time as SQLAlchemy
was developed. Both the salt 'DataModel' and SQLAlchemy libraries developed
specific advantages, but as a popular open sourced project, SQLAlchemy became
the more mature product.
In 2015 the Salt project chose to replace the internal 'DataModel' library
with the SQLAlchemy, due to wider use and greater development of the open
source project, but then found several key features of 'DataModel' were missing
from SQLAlchemy.
The solution was a new library 'ViewModel', which acted as an abstraction
layer between SQLAlchemy and the application. The name 'ViewModel' came from
the fact that the main elements present in 'DataModel' that were missing
from SQLAlchemy were data extended data schema information that were also
useful in providing data description to views.

The next step brought the current 'ViewModel', by transforming that library to
become an interface between pymongo and the application.

Data tables/collections and data views

The ViewModel package focuses on preparing data for views. How is the data
in a table/collection to be viewed? For example,
consider a 'Products' table or collection, where products may be viewed:
- individually by product code,
- as a list of products by product group, or by brand
- as a list through a custom search

These become the views of the data from the database. It is never relevant
to actually retrieve the entire table/collection for the products as if
processing the entire table, each document will be processed in sequence.
In contrast, there may be other table/collections with either a single or
small fixed number of rows/collections the entire table/collection may constitute
a view.

Further, product could have a join to a 'pack sizes' table/collection and
for some views these are also part of the view.

The main concept is that each table has a set of relevant views of the
table/collection for various uses. The viewmodel specifies not just the
schema of the table/collection, but the actual views of the table/collection.

- `Simple Example`_.
- `Describing a table/collection with ViewFields`_.
- `Using 'ViewField' derived classes`_.
- `Instancing ViewModels`_.
- `Building HTML forms`_.
- `Updating from HTML forms`_.

Simple example
This example is given in advance the instructions or details on how the
components of the example work. The idea is: read the example to gain an
overview, then see more details to understand more and return to this

The simple database
The consider a database with a table of students. Rows or Documents have

- an id
- a name
- a course
- year number within course

Code to describe table find an entry

The code follows::

from ViewModel import ViewModel, IdField, TxtField, IntField
import pymongo

database = pymongo.MongoClient(dbserver).get_database("example")

class StudentView(ViewModel):
viewName_ = "Students"
#models_ = #<database>.Students
id = IdField()
name = TxtField()
course = IntField()
# .... field definitions may continue

student = StudentView({}, models=database.Students)
# could have used 'models_' within class to avoid needing 'models' parameter
# for the init
# {} empty dictionary to ensure an empty view, not needed if the database
# does not even exist yet, as with a new database, initial view will always
# be an empty view

if len(student) > 0:
print("oh no, we already have data somehow!")

students.insert_() #add an empty entry to our view

with student: #use with so changes written at end of 'with' = 'Fred'

#ok.... now we have a 'Student' table with one entry

Code to read and update our entry
A key concept is that while the class for the view describes a table, set of
tables or joined tables (or collections in Mongo speak), an instance of
a ViewModel is the set of data, or a window of the tables.
Instancing the view actually reads from the
data base in simplest cases, although in more complex cases the data may be read
from the database when accessed, the view instance logically includes all data
from a 'read' operation::

#same class definition and imports as above

student = StudentView({'name': 'Fred'},model = database.Students)
# would save if we could have 'models_' in class definition!

if not student.course:
with student:
student.course_year = 2
student.course = 'Computing'

Multiple Entry Views
So far our view has only one entry. Instance of our view is a window viewing
part of the database. This window, can be a single row/collection or a logical
group of entries(from rows/collections), and for small tables, may even be
the entire table/collection. The code that follows adds another entry, so the sample has
more than one entry, then works with a multi entry

StudentView.models_ = database.Students
#modify class, add 'models_' as an attribute,
#this saves specifying 'models_' each time instancing StudentView

student = StudentView()
#no dictionary, this gives an empty view (not multi entry yet)

with student: #adding a second student = 'Jane'
student.course = "Computing"
student.course_year = 2

#now our multi entry view for all year 2 Students
students = StudentView({'course_year':2})

for student in students:

Note how multi entry view instances can be treated as lists. In fact, single
entry views can also be treated as a list, however for convenience view
properties for single entry views also allow direct access as one entry. For
a single entry view 'student':: == student[0].name

Example Summary
The example bypasses the power of ViewModels in order to a simple introduction.
A key concept is that classes describe a table ( or collection or set/join
of tables). An *instance* of a ViewModel is one set specific subset, a set of
data from a table (or set/join of multiple tables).

Describing a table/collection with ViewFields
When creating a class derived from a ViewModel, add class attributes
which are 'ViewFields' for each field in the table or collection.

The example ( 'Simple example'_. ) uses several types of view fields. However
each 'ViewField' can contain information well beyond the type of data.
An alternative name, a short and long description, formatting and other display
defaults, value constraints and many other settings.

In the example, only the 'value' attribute of the "name" ViewField is accessed.
'' does not access the ViewField, but instead returns "value"
attribute of the "name" ViewField. To access the
actual ViewField (or IntField, TextField etc) and have access to these other
attributes use 'student["name"]'. thus:: == student["name"].value

Using 'ViewField' derived classes

All 'fields' are sub-classed from ViewField, and represent individual data types.
Each field contains the following properties:

- name: set explicitly, or defaulting to the property name
- label: set explicitly but defaulting to the name
- hint: defaults to '' for display
- value: returns value when field is an attribute of a row object

'ViewModel' interface
The 'ViewModel' provides a base class defines a database table/collection, and each instance of
a ViewModel. Note all system properties and methods start of end with underscore to
avoid name collision with database field names.

ViewModel Interface Methods

- insert\_()
- labelsList\_()
- update\_()
- <iterate> for row in <viewmodel instance="">
- <index> <viewmodel instance="">[row]

ViewModel Interface Properties

- viewName\_
- models\_
- dbModels\_

ViewModel details
'insert_()' method adds a empty new row (ViewRow instance) to the current ViewModel
instance. At
the next 'update_()', an actual database document/row will be created, provided
some values have been set in the new row.

'labelsList_()' returns a list of the labels from the rows of the current
ViewModel instance.

'update_()' is called automatically at end of a 'with <viewmodel instance="">'
statement (python keyword 'with'), or can be called directly, to update the
actual database with values
changed by assignments through '<viewmodel instance="">.<fieldname> = statements.

'viewName\_' is simply a title for the view for display purposes.

'models\_' is a list of the names of tables, or actual database tables objects
used by the view

'dbModels\_' is a dictionary of database table objects used by the view, with
the model names as keys.

Note: all 'ViewModel' instances with one row implements all of the ViewRow
interface in addition to the methods and properties discussed. 'ViewModel'
instances with more than one row will raise errors if the 'ViewRow' interface
as it is ambiguous which row/document to use.

'ViewRow': The Row Interface
ViewRow objects and ViewModel objects both implement the 'ViewRow' interface.

Where a ViewModel contains one logical row, the operations can be performed
on the ViewModel, which also supports this interface for single row instances.

ViewRow Interface methods
- <iterate>: for field in <viewrow instance="">
- loop\_(case=<case>): for field in a <viewrow instance="">
- <index>: <viewrow instance="">[<field name="">]
- <attribute> <viewrow instance="">.field_name

ViewRow Interface Properties
- fields\_
- view\_
- label\_
- idx\_

ViewRow details
'for <field> in <viewrow instance="">:' provides for using a 'for loop' to iterate
over the fields in a row of a viewfield.

Note that this iteration can be for building a view, and as such the iteration
allows for selecting which fields are included in the view.
When fields are declared
(see `'ViewField' interface`_), they can set a 'case' where they are applicable
for views.
For example, this can be in a view, on an edit panel, or the field is for
calculation purposes and part of the model, but not revealed in a view.

<viewrow instance="">[<field name="">] or indexing, retrieves the instance of the
ViewField named. For example::

student['name'].value = 'Jane'

'fields\_' returns
A 'ViewRow' is a logical entry in a ViewModel. Consider the example
( 'Simple example'_. ). The line of code:: = 'Fred'

Is using the ViewRow set attribute interface to set the 'value' of the 'name'
field within the 'row' created by the insert\_() method.

In this example, because the 'student' ViewModel has only one row, the 'name'
field can be access directly in the ViewModel. However if there were, for example
three students in the view, which 'name' is to be changed? As stated previously,
ViewModel objects support the ViewRow interface, but report an error if there is more
than one row.

Thre are two main ways to access 'ViewRow' objects (apart from simple treating the
ViewModel as also a ViewRow, which only works for single row views). If our 'student'
contains three students, there will be a row for each student, and these 'rows'
could be accessed as::

students = StudentView({})
assert len(students) == 3 # check we have 3 students
student_0 = students[0]
student_2 = studnets[2]
for student in students:
<print details="" from="" student="">

>From the ViewModel, indexing or iterating can access the ViewRows.

This interface allows retrieving and setting data 'fields' or ViewField entries
by name as object attributes. All internal attributes of ViewRow have either
a trailing underscore to avoid name collisions with field names of the database,
or a leading underscore to indicate that these attributes should not be accessed
externally of the ViewRow or ViewModel.

Provided database fields have no leading or trailing underscore, they will not
collide with the names of internal workings of these classes.

Extended ViewModel Declarations and Instancing

The \_\_init\_\_ method calls 'getRows\_' which is designed for subclassing.
getRows\_ can return either:

1. an empty list (for an empty view)
2. the raw data from a find (where all data is from a single source and
in this case the 'source' parameter to the class is used to build dbRows\_
3. a list of dicts (for the rows, dict with one entry for each 'source',
and that entry itself being a dictionary of the fields of that 'source'.

Previous verisons of the library requried (2) to be instead a list of ObjDicts.
This is no longer supported. The statement::

# below statement no longer will produce functioning code
# remove it
result = [ObjDict(res) for res in result]

would convert the result of a find into a list of ObjDicts, where each ObjDict is
a row. What is now required is such data is embedded in a 'source' dictionary. A
replacement for the above line, (which is not need as the standard class init
method will make
this adjustment automatically), would be the line::

result = [Objdict(((row,res),)) for res in self.dbRows_]

models\_ and _sources
as the names suggest, 'models' is for 'public' use (or in this case declaration)
and _sources is 'private'. the data to construct '_sources' is provided in
but the _sources class variable, or the 'sources' parameter to a viewmodel

if sources (either _sources class variable or sources parameter), is not a list
then internal logic treats is as a one element list: [sources], so even if only
one value is provided, consider that value a one element list.

Each value in the 'models' list can be one of the legacy values of 'None' or a mongoDB collection,
or (preferred) an object instanced using a class based on the DBSource class. Currently,
four such classes exist: DBNoSource, DBVMSource, DBMongoSource and DBMongoEmbedSource.

When generating a sources list from 'models', a value of None is used as a legacy
alternative to create a DBNoSource object, but the preferred way is and explicit object.
Fields with a 'NoSource', as the class name suggests, have no database source and thus no storage
and as such are temporary values only. Since a collection or table name is not part
of a 'NoSource' object, the source name must be described explicitly or will be '__None__'.
Note that at the time of writing, any string entry in a source list that beginning with an
underscore will be taken as a DBNoSource object with the name of that string.

A dbvmsource is used for data that exists within another viewmodel. This allows nested views.
A this time, this is simply a provision for the future.

The source used for mongo collections, and instanced from legacy mongodbcollections, as
well as from the preferred explict instances. The 'name' of a DbMongSource is the name
of the collection. So the collection 'students' would have the string name 'students'.

These are used when the table is embedded within a document inside a mongo collection.
The source is specificed as "<collection>.<object-list_name>" where the object list name
is the object containing the entire embedded collection as a list of objects.

Declaring 'models_'
Models ('models_') may be declared as a class variable, or passed as a parameter ('models') to the
__init\__ method for the ViewModel.

In either case, the value is a list of each source, with each entry of one of the 'DBSource' types
listed above, or an application specific class derived from DBSource. Note that while models is in
theory a list, the code will convert a single entry into a list, eliminating the need to
have a single entry as a list.

Setting Field Source
Any field can belong to any 'source', as described above. The first 'source' for a view
is considered the default source, so if using the first source, or 'default source', it is
possible to simply omit
the 'src=' paramter. Any field which is from a view other than the first view,
needs specify the view by name with the 'src' parameter::

src=<name of="" the="" source="" as="" a="" string="">

For an embedded source, the name will use 'dot notation'.

Further, a field may be embedded in another object. The name of the object should also be a
specified through source. Examples::

models_ = DBMongoSource('students'), DBMongoSource('courses')

num1 = IntField() # no 'src' specified - field is in default 'students' collection
num2 = IntField(src='courses') # field is in 'courses' table/collection
num3 = IntField(src='courses.scores') # field is in scores object in courses table
num4 = IntField(src='students.scores') # field is in scores object in students table
num5 = IntField(src='.scores') # alternative using default notation, same location as 'num4'

'ViewField' interface

Getting and Setting 'Row Member' values

To be added

Building HTML Forms

To be added

Updating from HTML forms

To be added

Data relationships & Joins
The term 'relational database' comes from the concept that data contained
in separate tables (or collections) is related.

Data Relationship types
Many to one
These are classic 'dry'. Several records (or rows or documents) in a table
will use the same information. For example, and address with a city. Since
there are far more addresses than cities, when reading an address, obtaining all
the 'city' information (name, city code, state) from a separate city table will
mean that information for each city is not repeated for each address with the same
city. From the perspective of the address, the relationship is 'one-to-one' because
for each address there is only one city. The 'many-to-one' is that many addresses
may reference each city.

If our view is based on a single address, then retrieving the 'join' of the information
for the address together with the information for the city still leaves a single 'row'
in the resulting view.

In database design, to implement a 'many to one', each entry from the many table,
contains a key to the city table. Read an address, the use the 'key to the city'
to read data from the city table.

One To Many
>From a technical perspective, this is simply the same as 'Many to One', but viewed
from the opposite perspective. But there is devil in the detail, and having the
opposite perspective has implications that can mean the correct implementation
is very different. Looking at the previous cities and addresses, the 'one to many'
view from the city perspective is to consider all addresses with the city.

If our view is based on a single city, then retrieving the 'join' would result in rows for
each address. So while the one-to-many is the many-to-one from the opposite perspective,
the view changes entirely and in nature depending on which perspective.

In database design, the cross reference key is still the 'key to the city' within the
address table. Read the city key (as 'our city key'). Then using the key field find all addresses with
their 'key to the city' value matching the key in 'our city key'.

One of Many Selector
This is a real world application of the 'Many to one' join, where the table of possible 'ones'
effective represents one of a finite set of choices which may be chosen from a 'drop down list box'.
ViewModel has a specific Field Type, the 'EnumForeignField'. Note that to display choices for
editing the entire table of choices is required. There is no strict formulae as to
when the number of choices or total data of the choices table is too large, but generally
the system must have the capacity to consider having the entire table in memory acceptable.

Many to Many
Consider now database with not just addresses and cities, but also people. Each person
might have a relationship to several addresses. But rather than this being a
'One to Many' relationship, like the Cities -> Addresses, where viewed from the other
perspective, Addresses->Cities, for each address there would be only one city, this
time for each address there may be multiple people.

In database design, this usually represents more of a challenge. If we start with people, we cannot
look for addresses with a 'person key' field that matches since our person, since each address
will need to match potentially several (or many) people. The matching person cannot be
stored as a single value in our table. With SQL and even sometimes with NoSQL, the
solution is to have a separate table of relationships. If we read this table for all entries
matching our person we can find an entry for each relationship to an address for that person.
This solves the problem because we can have more relationships than we have either
people or addresses, so one entry per table will not work without a special table that can
have an entry for each relationship.

NoSQL like Mongo provides another alternative, which is keeping a list of relationships inside
one (or even both) of the tables. Since an entry in the table can be a list, we could keep
a list of addresses in the people table. Read a person and we have a list of addresses.
Read an address and we can read all people with our address in their address list. The
principle is still the same, but there is this implementation choice.

Relationship Specific Data
In some cases, there can be data specific to a relationship. Consider the following people,
addresses and then relationships::

People: Bob, Tom, Alice
Addresses: RedHouse, Office1, Office2, GreenHouse
Bob: RedHouse is 'home', Office1 is 'work'
Alice: RedHouse is 'home' and 'office'
Tom: GreenHouse is Home, RedHouse is 'work1' and Office2 'work2'

The relationships between the people can each have their own labels, just as
the relationships between people can. In fact each relationship can have a
label from each perspective. Consider people relationships where Bob could be
'husband' to Alice, but the same relationship from the other perspective could
be 'wife'.

So for Bob we may have to have not only added 'RedHouse' and created a relationship,
we also have to manage a label for the relationship.

In SQL, a join is a read, or update, of data from more than one table. The join uses
the relationship
between tables to select rows of data that combine information from multiple tables.
Each table in the join is effectively a source of data.

ViewModel support data from multiple sources, but currently this has only been used
to support joins from relationship tables and tables that are part of the relationship.

Inserts with joins
when a new document is inserted for any source within a viewmodel,
fields within the current view can be autmatically
updated to reference the new _id generated. These fields should be listed in
the _sources[<source updated="">].join_links list. This list is the field names
to be updated.

How it works
The rows structure
The actual data is kept in a view list called 'dbRows\_',
which reflects the actual data being held in the underlying
For each row of the view, there is one entry in dbRows\_.

The list elements of 'dbRows\_'
each entry is of type 'objdict' and the elements of the
objdict were originally the values of the fields in the
view, but a new layer has been added, so that 'objdict'
entries at the top level represent the data from a single

[ {'name':'Jane','course':'computing'}]

[ {'students': {'name':'Jane','course':'computing'}}]

The two tiered structure, keyed by the 'table/collection'
which is the data source, better provides for data from
multiple sources.

Data is not added directly to these rows, but through the 'viewmodel_row'
wrappers. So if a viewmodel row has a view_field (say 'last_name')
which is not present in the row, setting last name would add
a new field to the appropriate ObjDict within the row, but also an
an entry to an additional 'changes' copy of the row, which hold new values
not yet committed to the database.

The 'rows' and 'changes' are the bridges between what is in the
database files, and what is held in memory.

The DBSource Descriptor.
See the DBSource class documentation, but this class describes the sources of data
that are held within the dbRows.

Each 'row' has a set of a least one 'source'. Source types can be mongoDB table,
mongoDB document, memory, (and soon) another view.

Each source requires a method to load from the source, and update to the source. 'getrows' methods
currently takes a 'load filter' and uses that to load all sources, but
a struture is required to more flexibly to handle all sources.

Update methods again handles all source types.

It is suggested that a useful revision would be to have 'getrows' that calls a 'src_getrows
for each source and update call a src_update() for each source.

New getRows
A new getrows would take a filter dictionary or list as valid paramters.
each entry would need a lead, and a lazy. run 'leads' in sequence until lead returns a non zero list.
List is applied for that source, all other sources are empty, but have 'lazy' load available.

once a lead returns true,
scr_getrows_table () would apply a dictionary
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TODO: Brief introduction on what you do with files - including link to relevant help section.

File Name & Checksum SHA256 Checksum Help Version File Type Upload Date
ViewModel-0.3.2-py2.py3-none-any.whl (55.0 kB) Copy SHA256 Checksum SHA256 py2.py3 Wheel Feb 21, 2017
ViewModel-0.3.2.tar.gz (61.7 kB) Copy SHA256 Checksum SHA256 Source Feb 21, 2017

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