pyramid-route-7

Route 7

pyramid_route_7 extends pyramid’s routing to have provide a macro syntax that can be easier to maintain on larger projects.

It works through a ridiculously simple mechanism – when calling add_route_7 instead of add_route, the package expands the macros in the route declaration, then immediately calls pyramid’s own add_route.

Summary

pyramid_route_7 offers a microtemplating language for creating more maintainable routes in Pyramid:

For example, kv patterns can be created, such as these for matching date components:

config.include("pyramid_route_7")
config.add_route_7_kvpattern("year", r"\d\d\d\d")
config.add_route_7_kvpattern("month", r"\d\d")
config.add_route_7_kvpattern("day", r"\d\d")

Which can then be reused across multiple routes with a readable syntax:

config.add_route_7("calendar", "/calendar/{@year}/{@month}/{@day}")

This is equivalent to invoking:

config.add_route("calendar",  r"/calendar/{year:\d\d\d\d}/{month:\d\d}/{day:\d\d}")

A jsonify parameter will also create a secondary json route:

config.add_route_7("calendar", "/calendar/{@year}/{@month}/{@day}", jsonify=True)

Which is equivalent to invoking:

config.add_route("calendar",  r"/calendar/{year:\d\d\d\d}/{month:\d\d}/{day:\d\d}")
config.add_route("calendar|json",  r"/calendar/{year:\d\d\d\d}/{month:\d\d}/{day:\d\d}.json")

A paginate parameter will also create a secondary paginated route:

config.add_route_7("items", "/items", paginate=True)

Which is equivalent to invoking:

config.add_route("items",  r"/items")
config.add_route("items-paginated",  r"/items/{page:\d+}")

Both jsonify and paginate can be called together:

config.add_route_7("items_api", "/items/api", jsonify=True, paginate=True)

Which is equivalent to invoking:

config.add_route("items_api|json",  r"/items/api.jon")
config.add_route("items_api-paginated|json",  r"/items/api/{page:\d+}.json")
config.add_route("items_api-paginated",  r"/items/api/{page:\d+}")
config.add_route("items_api",  r"/items/api")

Links:

Github: https://github.com/jvanasco/pyramid_route_7
PyPy: https://pypi.org/project/pyramid-route-7/

Usage

There are two main patterns supported by pyramid_route_7:

route_kvpattern

A kvpattern ties a key to a pattern. The macro is invoked by the key, and generates both the key and pattern.

Here is a canonical example:

config.add_route_7_kvpattern("year", r"\d\d\d\d")
config.add_route_7_kvpattern("month", r"\d\d")
config.add_route_7_kvpattern("day", r"\d\d")
config.add_route_7("ymd", "/{@year}/{@month}/{@day}")

this will result in route_7 generating the following route:

config.add_route("ymd",  r"/{year:\d\d\d\d}/{month:\d\d}/{day:\d\d}")

note that they syntax for expanding a route_kvpattern is:

    @ key
[at-sign] key

route_pattern

A pattern represents a reusable regex. The macro is invoked by the pattern_name, and generates only the pattern regex.

Here is a canonical example:

config.add_route_7_pattern("d4", r"\d\d\d\d")
config.add_route_7_pattern("d2", r"\d\d")
config.add_route_7("ymd", r"/{year|d4}/{month|d2}/{day|d2}")
config.add_route_7("ymd-alt", "/alt/{@year}/{@month}/{@day}", jsonify=True)

this will result in route_7 generating the following routes:

config.add_route("ymd",  r"/{year:\d\d\d\d}/{month:\d\d}/{day:\d\d}")
config.add_route("ymd-alt",  r"/{year:\d\d\d\d}/{month:\d\d}/{day:\d\d}.json")
config.add_route("ymd-alt|json",  r"/{year:\d\d\d\d}/{month:\d\d}/{day:\d\d}.json")

note that they syntax for expanding a route_pattern is

key [pipe] pattern

while the syntax for a route is

key [colon] regex

also note the effect of jsonify=True is to create a secondary route with the following criteria:

route name has “|json” suffix
route pattern has “.json” suffix

Warnings

If an second pattern identical to a first pattern is added, this package will not raise an exception on the second add.

However, this mimics the behavior of Pyramid itself, which allows for multiple conflicting routes to be added without raising an error.

A future version may warn or raise exceptions on conflicting routes.

FAQ:

Q: Why this package?

In larger applications (dozens of routes), it’s not uncommon to see lots of patterns re-used.

This package was designed to consolidate the patterns in one place so they can be centrally managed and upgraded over time.

Q: Why the name “route_7”?

A: Two reasons: * It makes it trivial to implement on existing projects by replacing add_route with add_route_7, and vice-versa * “The Lurid Traversal of Route 7” by Hoover, might… just might… be the best album on Dischord records. (http://www.dischord.com/release/089/lurid-traversal-of-rte-7) Dischord put out a lot of great records.

Q: Any integration tips?

By default the package will emit logging activity on how it upgrades routes (expands macros) to the default logger. If you have any troubles, that will help!

A very fast way to integrate routes is just using find & replace.

Step 1 - Define Macros

Before you declare your first route like this:

config.add_route("main", "/")
config.add_route("foo", "/foo")
config.add_route("foo_paginated", r"/foo/{page:\d+}")

You should include the package and define some macros

# incude pyramid_route_7 and define our routes/macros
config.include("pyramid_route_7")
config.add_route_7_kvpattern("page", r"\d+")

     # okay, go!
     config.add_route("main", "/")
     config.add_route("foo", "/foo")
     config.add_route("foo_paginated", r"/foo/{page:\d+}")

Step 2 - Just use find & replace in a couple of passes

First, replace config.add_route with config.add_route_7:

    # incude pyramid_route_7 and define our routes/macros
    config.include("pyramid_route_7")
    config.add_route_7_kvpattern("page", r"\d+")

# okay, go!
# config.add_route("main", "/")
    config.add_route_7("main", "/")
# config.add_route("foo", "/foo")
config.add_route_7("foo", "/foo")
# config.add_route("foo_paginated", r"/foo/{page:\d+}")
config.add_route_7("foo_paginated", r"/foo/{page:\d+}")

Then find/replace your macros:

    # incude pyramid_route_7 and define our routes/macros
    config.include("pyramid_route_7")
    config.add_route_7_kvpattern("page", r"\d+")

    # okay, go!
config.add_route_7("main", "/")
config.add_route_7("foo", "/foo")
# config.add_route_7("foo_paginated", r"/foo/{page:\d+}")
config.add_route_7("foo_paginated", "/foo/{@page}")

Because add_route_7 simply expands registered macros and passes the result to Pyramid’s own add_route, you can just run it on every declared route. The performance hit is only at startup and is incredibly minimal (it’s really just a regex).

Metadata

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