Using gql for query editing

[abitrolly]

Can qgl be used to programmatically modify queries?

For example to transform this request.

    query getContinents {
      continents {
        code
        name
      }
    }

To this one.

    query getContinents {
      continents (code:"AF") {
        code
        name
      }
    }

gql.gql() parses the input into graphql AST DocumentNode, but it is not clear which methods are available to modify it, and how to write the query back as a string.

[leszekhanusz]

You can use the DSL module to create requests programmatically.

To convert a DocumentNode to string again, you can use the print_ast method of graphql.

[abitrolly]

I was able to convert a query to DocumentNode and back to string.

import gql

dg = gql.gql("""
    query getContinents {
      continents {
        code
        name
      }
    }
""")

from graphql import print_ast
print(print_ast(dg))

query getContinents {
  continents {
    code
    name
  }
}

However, I don't see any methods that allow to traverse the tree to find continents node and add a parameter to it.

[abitrolly]

It is not enough for editing to just use DSL to create queries. This one is addressed.

• How to parse query into "edit mode" and get back the string

However, two more questions are still left.

• How to find AST node that needs modification?
• How to modify it?

[leszekhanusz]

This not really a gql question but instead a graphql-core question.

You might want to look at the dsl module source code which does exactly that.
For example: to add an argument