Add a List of Posts to a Gatsby Blog with a GraphQL Page Query

Is anybody else getting a strange error from GrahpQl?

  Invariant Violation: GraphQLCompilerContext: Duplicate document named `HomepageQuery`. GraphQL fragments and roots must have unique names.
    t: Duplicate document named `HomepageQuery`. GraphQL fragments and roots must have unique names.```

1. Why use a 'Page query' instead of a 'Static' one?
2. It looks like a query exported in my index.js is available on other pages. Why does this happen?

Hey James, good question. It seems that StaticQuery can do most of the things that page query can, including fragments. The main differences are:

• page queries can accept variables (via pageContext) but can only be added to page components.
• StaticQuery does not accept variables (hence the name “static”), but can be used in any component, including pages.

As of Gatsby v2, StaticQuery seems to be the default choice. So I would suggest just using StaticQuery. Link to the documentation.