Create iteration cadence mutation [RUN ALL RSPEC] [RUN AS-IF-FOSS]

What does this MR do?

This MR adds GraphQL support to create iterations cadence within a given group. This is one MR out of a series of MRs to add support for iteration cadences.

More context on iterations and iteration cadences:

• &5077
• #293864 (closed)
• #322741 (closed)

To test it locally:

• With enabled feature flag:

 Feature.enable(:iteration_cadences)

• Then run the mutation in graphiql: /-/graphql-explorer
  • with success:

    mutation {
      createIterationsCadence(input: {groupPath: "top-group/sub-group", title: "Second cadence", startDate: "01-02-2021", durationInWeeks: 2, iterationsInAdvance: 2, automatic: false, automatic: true}) {
        iterationsCadence {
          id      
        }
        errors
      }
    }

  • with errors

    mutation {
      createIterationsCadence(input: {groupPath: "top-group/sub-group", title: "Second cadence", startDate: "01-02-2021", automatic: false, automatic: true}) {
        iterationsCadence {
          id      
        }
        errors
      }
    }

• With disabled feature flag:

   Feature.disable(:iterations_cadences)

  mutation {
     createIterationsCadence(input: {groupPath: "top-group/sub-group", title: "Second cadence", startDate: "01-02-2021", durationInWeeks: 2, iterationsInAdvance: 2, automatic:false, active:false}) {
      iterationsCadence {
        id      
      }
      errors
    }
  }

  • response

   {
    "data": {
      "createIterationsCadence": {
        "iterationsCadence": null,
        "errors": [
          "Operation not allowed"
        ]
      }
    }
  }

Screenshots (strongly suggested)

Does this MR meet the acceptance criteria?

Conformity

• Changelog entry
• Documentation (if required)
• Code review guidelines
• Merge request performance guidelines
• Style guides
• Database guides
• Separation of EE specific content

Availability and Testing

• Review and add/update tests for this feature/bug. Consider all test levels. See the Test Planning Process.
• Tested in all supported browsers
• Informed Infrastructure department of a default or new setting change, if applicable per definition of done

Security

If this MR contains changes to processing or storing of credentials or tokens, authorization and authentication methods and other items described in the security review guidelines:

• Label as security and @ mention @gitlab-com/gl-security/appsec
• The MR includes necessary changes to maintain consistency between UI, API, email, or other methods
• Security reports checked/validated by a reviewer from the AppSec team

re #322741 (closed)