Added ability to make constraints optional

[dusktreader]

Adresses issue #399

If a constraint is optional (has a key,value of optional=True), then
it will only be applied to the table when the table has a field
present to which the constraint applies. Thus, if a constraint is
added for the field 'foo' and that constraint is designated as
optional, then any table checked by the constraint will only have the
constraint applied if the table has a field named 'foo'

[alimanfoo]

Thanks Tucker, I'll review asap.

…

On Thursday, December 1, 2016, Tucker Beck ***@***.***> wrote: Adresses issue #399 <#399> If a constraint is optional (has a key,value of optional=True), then it will only be applied to the table when the table has a field present to which the constraint applies. Thus, if a constraint is added for the field 'foo' and that constraint is designated as optional, then any table checked by the constraint will only have the constraint applied if the table has a field named 'foo' ------------------------------ You can view, comment on, or merge this pull request online at: #400 Commit Summary - Added ability to make constraints optional File Changes - *M* petl/test/transform/test_validation.py <https://github.com/alimanfoo/petl/pull/400/files#diff-0> (33) - *M* petl/transform/validation.py <https://github.com/alimanfoo/petl/pull/400/files#diff-1> (96) Patch Links: - https://github.com/alimanfoo/petl/pull/400.patch - https://github.com/alimanfoo/petl/pull/400.diff — You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub <#400>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AAq8Qjn-S9BnL-bU-ehPBNBiGxX6aWKHks5rDyv_gaJpZM4LB2IJ> .

-- Alistair Miles Head of Epidemiological Informatics Centre for Genomics and Global Health <http://cggh.org> The Wellcome Trust Centre for Human Genetics Roosevelt Drive Oxford OX3 7BN United Kingdom Email: alimanfoo@googlemail.com Web: http://purl.org/net/aliman Twitter: https://twitter.com/alimanfoo Tel: +44 (0)1865 287721

[dusktreader]

@alimanfoo have you had a chance to review this yet?

[alimanfoo]

Sorry, totally snowed under. Will take a look asap.

…

On Monday, December 12, 2016, Tucker Beck ***@***.***> wrote: @alimanfoo <https://github.com/alimanfoo> have you had a chance to review this yet? — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub <#400 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AAq8QgVG1V1r4SVQFuk_U7DKwjJURRE2ks5rHYW3gaJpZM4LB2IJ> .

-- Alistair Miles Head of Epidemiological Informatics Centre for Genomics and Global Health <http://cggh.org> The Wellcome Trust Centre for Human Genetics Roosevelt Drive Oxford OX3 7BN United Kingdom Email: alimanfoo@googlemail.com Web: http://purl.org/net/aliman Twitter: https://twitter.com/alimanfoo Tel: +44 (0)1865 287721

[alimanfoo]

Looks great to me, thank you!