Schema tutorialLesson 29: Importing a post from another WordPress site
Lesson 29: Importing a post from another WordPress site
This tutorial lesson demonstrates how we can keep WordPress sites in sync, by importing a post from some WordPress site into our local WordPress site.
GraphQL query to import a post from another WordPress site
The GraphQL query below connects to an upstream website's GraphQL endpoint, fetches the data for a specific post, and imports it locally. The Gato GraphQL plugin (free version) must be installed on the upstream website too.
(If Gato GraphQL is not installed on the upstream site, the query can be adapted to connect to its WP REST API endpoints instead.)
The resources referenced in the post must all exist locally:
- The author
- The featured image (if any)
- The categories
- (Tags also, however if these do not already exist, they are created together with the post, so it's not an issue)
As the common identifier for resources between the upstream and local sites, we use:
- Slugs for categories, tags and media items
- Usernames for users
If any of the resources does not exist in the local site, the GraphQL query prints an error and halts the import.
query InitializeDynamicVariables
@configureWarningsOnExportingDuplicateVariable(enabled: false)
{
initVariablesWithFalse: _echo(value: false)
@export(as: "requestProducedErrors")
@export(as: "responseHasErrors")
@export(as: "postIsMissing")
@export(as: "postHasAuthor")
@export(as: "postHasFeaturedImage")
@export(as: "postHasCategories")
@export(as: "postHasTags")
@remove
initVariablesWithNull: _echo(value: null)
@export(as: "existingAuthorUsername")
@export(as: "existingFeaturedImageSlug")
@export(as: "featuredImageMutationInput")
@remove
initVariablesWithEmptyArray: _echo(value: [])
@export(as: "existingCategorySlugs")
@export(as: "existingTagSlugs")
@remove
}
query CheckIfPostExistsLocally($postSlug: String!)
@depends(on: "InitializeDynamicVariables")
{
localPost: post(
by: { slug: $postSlug }
status: any
) {
id
}
postAlreadyExists: _notNull(value: $__localPost)
@export(as: "postAlreadyExists")
}
query FailIfPostAlreadyExistsLocally($postSlug: String!)
@depends(on: "CheckIfPostExistsLocally")
@include(if: $postAlreadyExists)
{
errorMessage: _sprintf(
string: "Post with slug '%s' already exists locally",
values: [$postSlug]
) @remove
_fail(
message: $__errorMessage
data: {
slug: $postSlug
}
) @remove
createPost: _echo(value: null)
}
query ConnectToGraphQLAPI(
$upstreamServerGraphQLEndpointURL: String!
$postSlug: String!
)
@depends(on: "FailIfPostAlreadyExistsLocally")
@skip(if: $postAlreadyExists)
{
externalData: _sendGraphQLHTTPRequest(input:{
endpoint: $upstreamServerGraphQLEndpointURL,
query: """
query GetPost($postSlug: String!) {
post(by: { slug: $postSlug }) {
id
slug
rawTitle
rawContent
rawExcerpt
author {
id
username
}
featuredImage {
id
slug
}
categories {
id
slug
}
tags {
id
slug
}
}
}
""",
variables: [
{
name: "postSlug",
value: $postSlug
}
]
})
@export(as: "externalData")
requestProducedErrors: _isNull(value: $__externalData)
@export(as: "requestProducedErrors")
@remove
}
query ValidateResponse
@depends(on: "ConnectToGraphQLAPI")
@skip(if: $postAlreadyExists)
@skip(if: $requestProducedErrors)
{
responseHasErrors: _propertyIsSetInJSONObject(
object: $externalData
by: {
key: "errors"
}
)
@export(as: "responseHasErrors")
@remove
postExists: _propertyIsSetInJSONObject(
object: $externalData
by: {
path: "data.post"
}
)
@remove
postIsMissing: _not(value: $__postExists)
@export(as: "postIsMissing")
@remove
}
query FailIfResponseHasErrors
@depends(on: "ValidateResponse")
@skip(if: $postAlreadyExists)
@skip(if: $requestProducedErrors)
@skip(if: $postIsMissing)
@include(if: $responseHasErrors)
{
errors: _objectProperty(
object: $externalData,
by: {
key: "errors"
}
) @remove
_fail(
message: "Executing the GraphQL query against the upstream webserver produced error(s)"
data: {
errors: $__errors
}
) @remove
createPost: _echo(value: null)
}
query FailIfPostNotExists($postSlug: String!)
@depends(on: "FailIfResponseHasErrors")
@skip(if: $requestProducedErrors)
@include(if: $postIsMissing)
{
errorMessage: _sprintf(
string: "There is no post with slug '%s' in the origin",
values: [$postSlug]
) @remove
_fail(
message: $__errorMessage
data: {
slug: $postSlug
}
) @remove
createPost: _echo(value: null)
}
query ExportInputs
@depends(on: "FailIfPostNotExists")
@skip(if: $postAlreadyExists)
@skip(if: $requestProducedErrors)
@skip(if: $responseHasErrors)
@skip(if: $postIsMissing)
{
postData: _objectProperty(
object: $externalData,
by: { path: "data.post" }
) @remove
postTitle: _objectProperty(
object: $__postData,
by: { key: "rawTitle" }
)
@export(as: "postTitle")
@remove
postContent: _objectProperty(
object: $__postData,
by: { key: "rawContent" }
)
@export(as: "postContent")
@remove
postExcerpt: _objectProperty(
object: $__postData,
by: { key: "rawExcerpt" }
)
@export(as: "postExcerpt")
@remove
postAuthorUsername: _objectProperty(
object: $__postData,
by: { key: "author" }
)
@passOnwards(
as: "author"
)
@applyField(
name: "_notNull",
arguments: {
value: $author
},
passOnwardsAs: "hasAuthor"
)
@if(condition: $hasAuthor)
@applyField(
name: "_objectProperty",
arguments: {
object: $author,
by: { key: "username" }
},
setResultInResponse: true
)
@export(as: "postAuthorUsername")
@remove
postHasAuthor: _notNull(
value: $__postAuthorUsername
)
@export(as: "postHasAuthor")
@remove
postFeaturedImageSlug: _objectProperty(
object: $__postData,
by: { key: "featuredImage" }
)
@passOnwards(
as: "featuredImage"
)
@applyField(
name: "_notNull",
arguments: {
value: $featuredImage
},
passOnwardsAs: "hasFeaturedImage"
)
@if(condition: $hasFeaturedImage)
@applyField(
name: "_objectProperty",
arguments: {
object: $featuredImage,
by: { key: "slug" }
},
setResultInResponse: true
)
@export(as: "postFeaturedImageSlug")
@remove
postHasFeaturedImage: _notNull(
value: $__postFeaturedImageSlug
)
@export(as: "postHasFeaturedImage")
@remove
postCategorySlugs: _objectProperty(
object: $__postData,
by: { key: "categories" }
)
@underEachArrayItem(
passValueOnwardsAs: "category"
)
@applyField(
name: "_objectProperty"
arguments: {
object: $category,
by: {
key: "slug"
}
}
setResultInResponse: true
)
@export(as: "postCategorySlugs")
@remove
postHasCategories: _notEmpty(
value: $__postCategorySlugs
)
@export(as: "postHasCategories")
@remove
postTagSlugs: _objectProperty(
object: $__postData,
by: { key: "tags" }
)
@underEachArrayItem(
passValueOnwardsAs: "tag"
)
@applyField(
name: "_objectProperty"
arguments: {
object: $tag,
by: {
key: "slug"
}
}
setResultInResponse: true
)
@export(as: "postTagSlugs")
@remove
postHasTags: _notEmpty(
value: $__postTagSlugs
)
@export(as: "postHasTags")
@remove
}
query ExportExistingResources
@depends(on: "ExportInputs")
@skip(if: $postAlreadyExists)
@skip(if: $requestProducedErrors)
@skip(if: $responseHasErrors)
@skip(if: $postIsMissing)
{
existingAuthorByUsername: user(by: { username: $postAuthorUsername })
@include(if: $postHasAuthor)
{
id
username @export(as: "existingAuthorUsername")
}
existingFeaturedImageBySlug: mediaItem(by: { slug: $postFeaturedImageSlug })
@include(if: $postHasFeaturedImage)
{
id
slug @export(as: "existingFeaturedImageSlug")
}
existingCategoriesBySlug: postCategories(filter: { slugs: $postCategorySlugs })
@include(if: $postHasCategories)
{
id
slug @export(as: "existingCategorySlugs", type: LIST)
}
existingTagsBySlug: postTags(filter: { slugs: $postTagSlugs })
@include(if: $postHasTags)
{
id
slug @export(as: "existingTagSlugs", type: LIST)
}
}
query ExportMissingResources
@depends(on: "ExportExistingResources")
@skip(if: $postAlreadyExists)
@skip(if: $requestProducedErrors)
@skip(if: $responseHasErrors)
@skip(if: $postIsMissing)
{
isAuthorMissing: _notEquals(
value1: $postAuthorUsername,
value2: $existingAuthorUsername
) @export(as: "isAuthorMissing")
isFeaturedImageMissing: _notEquals(
value1: $postFeaturedImageSlug,
value2: $existingFeaturedImageSlug
) @export(as: "isFeaturedImageMissing")
missingCategorySlugs: _arrayDiff(
arrays: [$postCategorySlugs, $existingCategorySlugs]
) @export(as: "missingCategorySlugs")
areCategoriesMissing: _notEmpty(
value: $__missingCategorySlugs
) @export(as: "areCategoriesMissing")
# missingTagSlugs: _arrayDiff(
# arrays: [$postTagSlugs, $existingTagSlugs]
# ) @export(as: "missingTagSlugs")
# areTagsMissing: _notEmpty(
# value: $__missingTagSlugs
# ) @export(as: "areTagsMissing")
isAnyResourceMissing: _or(
values: [
$__isAuthorMissing,
$__isFeaturedImageMissing,
$__areCategoriesMissing,
# $__areTagsMissing,
]
) @export(as: "isAnyResourceMissing")
}
query FailIfAnyResourceIsMissing
@depends(on: "ExportMissingResources")
@skip(if: $postAlreadyExists)
@skip(if: $requestProducedErrors)
@skip(if: $postIsMissing)
@skip(if: $responseHasErrors)
@include(if: $isAnyResourceMissing)
{
performingValidations: id
@if(condition: $isAuthorMissing)
@fail(
message: "Author is missing in local site"
data: {
missingAuthorByUsername: $postAuthorUsername
}
condition: ALWAYS
)
@if(condition: $isFeaturedImageMissing)
@fail(
message: "Featured image is missing in local site"
data: {
missingFeaturedImageBySlug: $postFeaturedImageSlug
}
condition: ALWAYS
)
@if(condition: $areCategoriesMissing)
@fail(
message: "Categories are missing in local site"
data: {
missingCategoriesBySlug: $missingCategorySlugs
}
condition: ALWAYS
)
# @if(condition: $areTagsMissing)
# @fail(
# message: "Tags are missing in local site"
# data: {
# missingTagBySlug: $missingTagSlugs
# }
# condition: ALWAYS
# )
createPost: _echo(value: null)
}
query ExportMutationInputs
@depends(on: "FailIfAnyResourceIsMissing")
@skip(if: $postAlreadyExists)
@skip(if: $requestProducedErrors)
@skip(if: $responseHasErrors)
@skip(if: $postIsMissing)
@skip(if: $isAnyResourceMissing)
{
featuredImageMutationInput: _echo(value: {
slug: $postFeaturedImageSlug
})
@include(if: $postHasFeaturedImage)
@export(as: "featuredImageMutationInput")
@remove
}
mutation ImportPost(
$postSlug: String!
)
@depends(on: "ExportMutationInputs")
@skip(if: $postAlreadyExists)
@skip(if: $requestProducedErrors)
@skip(if: $responseHasErrors)
@skip(if: $postIsMissing)
@skip(if: $isAnyResourceMissing)
{
createPost(input: {
status: draft,
slug: $postSlug
title: $postTitle
contentAs: {
html: $postContent
},
excerpt: $postExcerpt
authorBy: {
username: $postAuthorUsername
},
featuredImageBy: $featuredImageMutationInput,
categoriesBy: {
slugs: $postCategorySlugs
},
tagsBy: {
slugs: $postTagSlugs
}
}) {
status
errors {
__typename
...on ErrorPayload {
message
}
}
post {
id
date
status
slug
title
content
excerpt
author {
id
username
}
featuredImage {
id
slug
}
categories {
id
slug
}
tags {
id
slug
}
}
}
}(As we've seen on previous tutorial lessons) We use the Field to Input feature (with syntax $__field) to pass the field's resolved value to a contiguous field.
When we need to pass the field's resolved value to a directive, we must instead use directive @passOnwards (which is similarly provided by the Field to Input extension).
This query:
{
posts {
id
hasComments
notHasComments: _not(value: $__hasComments)
}
}...is equivalent to this query:
{
posts {
id
hasComments
notHasComments: hasComments
@passOnwards(as: "postHasComments")
@applyField(
name: "_not"
arguments: {
value: $postHasComments
},
setResultInResponse: true
)
}
}@passOnwards is useful to produce some computation on the value of the field. For instance, in the GraphQL query above, it is used to check if the user property is not null, before extracting its username property (and overriding the field value with it):
postAuthorUsername: _objectProperty(
object: $__postData,
by: { key: "author" }
)
@passOnwards(
as: "author"
)
@applyField(
name: "_notNull",
arguments: {
value: $author
},
passOnwardsAs: "hasAuthor"
)
@if(condition: $hasAuthor)
@applyField(
name: "_objectProperty",
arguments: {
object: $author,
by: { key: "username" }
},
setResultInResponse: true
)
@export(as: "postAuthorUsername")
@remove[WIP] Automatically importing missing resources
The Gato GraphQL schema must be upgraded with mutations to:
This is a work in progress. Once these mutations are supported, we can then have the GraphQL query automatically import each of the missing resources.