Class: Parse::Constraint::WriteableByConstraint

Inherits:
Constraint
  • Object
show all
Includes:
AclConstraintHelpers
Defined in:
lib/parse/query/constraints.rb

Overview

Note:

This constraint uses aggregation pipeline because Parse Server restricts direct queries on the internal _wperm field.

ACL Write Permission Query Constraint Query objects based on write permissions using MongoDB's internal _wperm field. Parse Server restricts direct queries on _wperm, so this uses aggregation pipeline.

Examples:

Find objects with NO write permissions (master key only / read-only)

Song.query.where(:acl.writeable_by => [])

Find objects writable by a specific user ID

Song.query.where(:acl.writeable_by => "userId123")
Song.query.where(:acl.writeable_by => current_user)

Find objects writable by a role

Song.query.where(:acl.writeable_by => "role:Admin")

Direct Known Subclasses

WritableByConstraint

Instance Method Summary collapse

Instance Method Details

#build ⇒ Hash

Returns the compiled constraint using aggregation pipeline.

Returns:

  • (Hash) —

    the compiled constraint using aggregation pipeline.



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# File 'lib/parse/query/constraints.rb', line 3117

def build
  keys = normalize_acl_keys(@value)

  if keys.empty?
    # Empty array = no write permissions (master key only)
    pipeline = [
      {
        "$match" => {
          "$or" => [
            { "_wperm" => { "$exists" => true, "$eq" => [] } },
            { "_wperm" => { "$exists" => false } },
          ],
        },
      },
    ]
  else
    # Find objects writable by ANY of the specified keys
    pipeline = [
      {
        "$match" => {
          "_wperm" => { "$in" => keys },
        },
      },
    ]
  end

  { "__aggregation_pipeline" => pipeline }
end

#writeable_by ⇒ WriteableByConstraint

A registered method on a symbol to create the constraint.

Examples:

q.where :acl.writeable_by => []
q.where :acl.writeable_by => "userId"

Returns:



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# File 'lib/parse/query/constraints.rb', line 3114

register :writeable_by