#161291016 Enable pagination support

[KvNGCzA]

What does this PR do?

have get api/v1/articles?page=number&limit=number route working with pagination support.

Description of Task to be completed?

• add pagination support for fetch articles route
• add validator for pageNumber
• add middleware to fetch all articles route
• add tests for fetch articles route

How should this be manually tested?

• npm start to start your server
• npm run db-init to pouplate your database
• use your browser or postman to hit the localhost:{PORT}/api/v1/articles route

Any background context you want to provide?

N/A

What are the relevant pivotal tracker stories?

#161291016

Screenshots (if appropriate)

Fetching all articles

Error if page query and limit query are not integers

Error if page query or limit query are less than 1

Error if available page number is exceeded

Error if queries are not provided

Questions:

N/A

[sulenchy]

I observe you are using req.params. I would have preferred req.query because pagination is more like filtration. I think a URL such as /article?page=2 looks much better than /article/page/2. Can you weigh the balance?

[augustineezinwa]

@mbilesanmi LGTM

[coveralls]

Pull Request Test Coverage Report for Build 478

• 29 of 29 (100.0%) changed or added relevant lines in 5 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.5%) to 92.799%

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Totals
Change from base Build 471:	0.5%
Covered Lines:	459
Relevant Lines:	478

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💛 - Coveralls