# `MishkaBlog.Resources.Calculations.EffectivePermissions`
[🔗](https://github.com/mishka-group/mishka_blog/blob/v0.0.1/lib/mishka_blog/resources/__calculations/effective_permissions.ex#L5)

The permissions a post or a category opens with on its blog page, in its sitemap entry and
wherever else a reader is let in, and those a comment is reached with:

  * a category — its own, else those of the nearest parent category that names some;
  * a post — its own, else those of every category it is filed under, each as that category
    opens with. Holding one of any of them is enough. A post in no locked category is public;
  * a comment — its post's.

What a record names itself always wins over what it would take from above. A tag is only
assigned to a post, so it locks nothing but its own page and has no such calculation.

A category counts while it exists, whatever its status: setting a locked category to draft does
not open the posts filed under it. A deleted one counts no more. The categories are read only
for the records that name nothing themselves, one read per site for the whole batch.

A record that names nothing opens with none, and reads nothing, while no category of its site
names any (for a comment, while no post or category does): `collections_locked?` and
`locks_apply?`, calculations of the resources, are loaded with the record, for the site the read
runs for.

    calculate :effective_permissions, {:array, :string}, {EffectivePermissions, kind: :post}

# `describe`

# `has_calculate?`

# `has_expression?`

# `init`

# `strict_loads?`

---

*Consult [api-reference.md](api-reference.md) for complete listing*