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|
module Guff
class PostModel < Model
SQL = TemplateCache.new({
tags: "
SELECT DISTINCT
post_id
FROM (%{sql})
",
tag: "
SELECT a.post_id
FROM post_tags a
JOIN tags b
ON (b.tag_id = a.tag_id)
WHERE b.name = '%{tag}'
",
count_posts: "
SELECT COUNT(*)
FROM posts a
JOIN (%{tags}) b
ON (b.post_id = a.post_id)
WHERE a.site_id = :site_id
AND %{filter}
",
get_posts: "
SELECT %{cols}
FROM posts a
JOIN (%{tags}) b
ON (b.post_id = a.post_id)
WHERE a.site_id = :site_id
AND %{filter}
ORDER BY %{sort} %{dir}
OFFSET :offset LIMIT :limit
",
})
def initialize(models : Models)
super(models, SQL)
end
COLUMNS = {
"post_id": {
default: true,
sortable: true,
clause: "a.post_id",
},
"name": {
default: true,
sortable: true,
clause: "a.name",
},
"body": {
default: false,
sortable: true,
clause: "a.body",
},
"html": {
default: true,
sortable: true,
clause: "a.html",
},
"posted_at": {
default: true,
sortable: true,
clause: "a.posted_at",
},
"created_at": {
default: true,
sortable: true,
clause: "a.created_at",
},
"tags": {
default: true,
sortable: false,
clause: "
(SELECT group_agg(d.name, '|')
FROM post_tags c
JOIN tags d
ON (d.tag_id = c.tag_id)
WHERE d.post_id = a.post_id)
",
},
}
#####################
# get_posts methods #
#####################
def get_posts(
cols = nil : Array(String)?,
site_id = nil : Int?,
q = "" : String,
tags = [] of Array(String) : Array(Array(String)),
page = 1 : Int,
limit = 20 : Int,
sort = "posted_at" : String,
dir = "desc" : String,
)
# build sql args
sql_args = {
"site_id": (site_id || @models.site.get_default).to_s,
} of String => String
# build tmpl args
tmpl_args = {
# TODO
"filter": "1 = 1", # true
"sort": get_sort_clause(sort),
"dir": dir,
"tags": get_tags_filter(tags),
"cols": get_columns_clause(cols),
}
# count number of matching rows
num_rows = (one(:count_posts, sql_args, tmpl_args).to_s || 0).to_i
# TODO: add Post class?
rows = [] of Post
if num_rows > 0
all(:get_posts, sql_args.merge({
":offset": ((page - 1) * limit).to_s,
":limit": limit.to_s,
}), tmpl_args) do |row|
rows << Post.new(row)
nil
end
end
# return result
Results(Post).new(
page: page,
limit: limit,
num_rows: num_rows,
rows: rows,
)
end
private def get_sort_clause(
sort : String
) : String
# verify sort column
raise "unknown sort column" unless COLUMNS.has_key?(sort)
raise "column is not sortable" unless COLUMNS[sort][:sortable]
# return result
COLUMNS[sort][:clause] as String
end
private def get_columns_clause(
cols : Array(String)?
) : String
(cols || COLUMNS.keys.select { |col|
COLUMNS[col][:default]
}).map { |col|
"%s AS %s" % [COLUMNS[col][:clause], col]
}.join(", ")
end
NO_POSTS = "
SELECT post_id
FROM posts
LIMIT 0
"
private def get_tags_filter(
tag_sets : Array(Array(String))
) : String
(tag_sets.size > 0) ? template(:tags, {
"sql": tag_sets.map { |tags|
template(:tags, {
"sql": tags.map { |tag|
template(:tag, {
"tag": @models.db.quote(tag),
})
}.join(" INTERSECTS "),
})
}.join(" UNION "),
}) : NO_POSTS
end
def add_post(req)
# TODO: return post id
{ok: true}
end
def remove_posts(req)
# TODO
{ok: true}
end
def set_tags(req)
# TODO
{ok: true}
end
end
end
|
